AI-Driven Code Refactoring for Legacy Apps

Let's Talk
  • LOCK IN DOMAIN LOGIC

    Extract legacy state transitions with Artificial Intelligence. Verify parity against generated tests and trace-backed baselines.

  • MODERNIZE WITHOUT DOWNTIME

    Deploy isolated slices using AI-orchestrated CI/CD pipelines with built-in quality checks and instant rollback.

  • CONTROL RELEASES

    Trace every commit to production with live metrics. Each build carries its own evidence: traces, policy check results, and test diffs.

Why It Matters

What Breaks When Legacy Code Is Rewritten

Legacy systems hold the logic that drives operations, decisions, and competitiveness. Stripping that away in refactoring software means stripping away the essence of your product.

Research from McKinsey shows that generative AI can accelerate modernization by up to 50% and cut costs by 40%, while raising output quality. The challenge is to harness that power while maintaining mission-critical continuity.

That’s exactly what our AI Accelerator™ delivers — an engineering approach to modernization that captures business logic before any refactoring begins and rebuilds each slice with full behavioral parity. AI-generated tests, drift detection, and automated quality gates ensure transparency for every change and predictability for every release. Your competitive edge remains intact.

Modernizing unstable systems? Launching new products?

We build development environments that deliver enterprise-grade scalability, compliance-driven security, and control baked in from day one.

Check Our Portfolio
Our Edge

Why choose Devox Software?

  • Modernize
  • Build
  • Innovate

Legacy code is slowing delivery and blocking product growth?

We apply AI-driven refactoring to prepare your stack for future releases.

Maintenance costs rising while performance stagnates?

We use AI to optimize code, delivering measurable efficiency gains and cost reductions.

Facing compliance risks with outdated architecture?

We modernize every component with audit-ready governance built in from the start.

Need to migrate legacy apps using AI code refactoring while preserving business logic?

We use AI to guide migration slices, with parity checks on each slice before cutover.

Team overloaded with manual refactoring tasks?

We automate repetitive code rewrites, schema transformations, and test generation.

Struggling with slow release cycles and fragile deployments?

We integrate AI into CI/CD pipelines and infrastructure as code, delivering faster releases.

Want to add new features without breaking legacy logic?

We build AI-generated tests and validation layers that catch regressions before a slice merges.

Looking to extend your platform with built-in AI capabilities?

We deploy intelligent modules into a clean, modernized codebase — ready for advanced features.

Need scalability without hidden risks?

We re-architect with AI-driven observability and predictive monitoring, providing your system with stability.

What We Offer

Services We Provide

  • Modernization Backlog

    Uncover the hidden logic buried in your legacy codebase.

    We extract, analyze, and map the actual behavior of your system, creating a transformation plan that aligns with your architecture, constraints, and business logic, and guides you on where to safely restructure code.

    Legacy code is not just hidden in outdated files. It stretches across undocumented modules, hidden dependencies, and forgotten data flows. No one person understands the full system anymore. Without insight, modernization is just guesswork.

    What we deliver:

    • AI-powered dependency mapping. Our refactoring automation tool processes runtime traces and static code to identify every functional dependency, integration point, and modular fracture.
    • Semantic logic extraction. Our code transformation AI pipeline detects and classifies workflows, branching logic, state transitions, and data movement across deeply embedded legacy layers.
    • Modernization backlog construction. We convert the extracted logic into a structured plan that guides legacy code modernization through prioritized, low-risk iterations.
    • Automated risk zone detection. AI-driven heatmaps flag complexity clusters, coupling spikes, deprecated APIs, and volatility zones, tagging each with a code risk and testability score.
    • Cross-cutting dependency identification. We isolate layers that span multiple modules — a critical step when refactoring monolithic code — to prevent architectural surprises and support early design decisions.

    You get a clear blueprint: what to change, how, and in what order — without breaking what works.

  • Codebase Audit

    See your system for what it truly is.

    We analyze your legacy codebase in detail and generate AI-powered reports that explain how your code actually works.

    Legacy systems often outlast the teams that originally built them and hide cumulative cybersecurity risks that surface only during runtime analysis. Version drift, logic duplication, dead zones, and undocumented hacks pile up into a black box. You can’t modernize what you don’t fully understand, and spreadsheets are no longer enough.

    What we deliver:

    • Multi-dimensional code audit. Our AI tools perform AI-driven code cleanup at scale, scanning hundreds of thousands of lines across all layers to detect deprecated patterns, version drift, and hidden dependencies.
    • AI-driven performance & debt profiling. AI processes telemetry, usage logs, and code churn to surface runtime bottlenecks, generate heatmaps of coupling, cohesion, and volatility, and highlight hotspots in cybersecurity risk factors.
    • Business logic localization. We trace operational flows back to real domain behavior. What does this code actually do? Which modules contain pricing logic, workflow orchestration, or user permissions?
    • Cross-cutting risk zones. We detect hidden impact zones, shared auth modules, unbounded database access, or UI logic embedded deep in backends. These are the areas most likely to cause silent failures.
    • Migration complexity scoring. Each module is assigned a migration score based on size, integration surface, data entanglement, and test coverage, and is annotated with factors related to authentication and cybersecurity that affect the cutover strategy.

    Forget pretty diagrams — what you need is real insight into what could break and why. This audit transforms your legacy stack into structured, actionable insights — the kind you can act on, track against, and build a roadmap from.

  • Slice-Based Refactor Execution

    We transform legacy codebases slice by slice, isolating logic, containing regressions, and deploying safely with zero business disruption, using AI that writes code for you.

    Legacy systems are too critical for big-bang rewrites. Even a single regression can introduce unexpected failures. That’s why we don’t just refactor — we deliver with precision, control, and built-in rollback safety.

    What we deliver:

    • Slice-level delivery cadence. We break down the system into functional slices: vertical flows, logic units, or integration domains to enable AI code refactoring per slice.
    • Quality gates in CI/CD. Every slice must meet complexity benchmarks, pass static analysis, reach test coverage thresholds, and clear policy checks before it can be merged or deployed.
    • Slice-level release pipelines. Every refactored unit is deployed through its own isolated pipeline with built-in tracking for technical debt reduction, rollback points, and deployment reports.
    • Live-in-production rollouts. Each slice is released into live environments with zero downtime, supported by semantic code refactoring that maintains functional equivalence throughout.
    • Change traceability. From commit to deployment, every change is traceable. You know what changed, where it lives, what it impacts, and whether it passed.

    You’re not just rewriting your codebase — you’re replacing it live, without downtime. Slice-based execution transforms modernization from a risky one-time event into a repeatable, auditable process, with certified .NET refactoring steps for each slice. It’s surgical, modular, reversible, and designed to keep your system operational every step of the way.

  • Regression Shielding

    Modernize without losing functional integrity.

    We generate structured, logic-aware test suites that validate behavior across both legacy and refactored code.

    Legacy systems often evolve without proper test coverage. Core logic lives undocumented. UI regressions sneak in. Business rules shift silently. Manual QA can’t catch everything, and usually finds out too late.

    What we deliver:

    • AI-reconstructed path coverage. AI reconstructs critical usage paths and edge cases from production traces, auto-generating test flows that capture all key business behaviors.
    • Legacy behavior lockdown. Before refactoring, we take a snapshot of the current behavior: outputs, state transitions, and side effects. These become the benchmark for refactored versions. We don’t hope for equivalence — we verify it.
    • AI-augmented testing pipeline. All tests, generated and managed by AI, integrate with CI/CD to enforce quality gates and instantly halt delivery if thresholds are missed.
    • Time-bound drift detection. We monitor test diffs across time: did logic silently shift? Was something lost across multiple sprints? Our pipelines compare the current state to expected behavior across releases.
    • Business logic verification layer. We extract business decisions from legacy code (pricing, approvals, eligibility) and encode them as test assertions, ensuring that refactored systems preserve real-world correctness.

    Regression Shielding cuts testing costs, accelerates time-to-market, and ensures functional integrity is preserved across all AI code refactoring phases.

  • Post-refactor Audits

    Secure the outcome. Equip your team.

    We validate every refactored slice technically, behaviorally, and operationally, and transfer full ownership to your team with no blind spots left behind using AI code refactor.

    Successful refactoring isn’t just about completing the code — it’s about ensuring that your team understands, trusts, and can evolve what’s been delivered. Without proper validation and clear handover, old patterns tend to resurface. Most teams inherit modernized systems they didn’t ask for, don’t fully grasp, and can’t safely extend.

    • AI-powered maintainability audits. AI reviews refactored slices for complexity, coupling, readability, and modularity to validate the outcomes of automated refactoring and benchmark them against legacy baselines.
    • Automated functional parity verification. We confirm that business rules, workflows, and output logic remain consistent by validating behavioral parity across AI-driven test suites, runtime observations, and automated rollback scenarios.
    • Intelligent architecture documentation. We generate diagrams, annotated logic flows, API schemas, and migration lineage for every refactored module, delivering AI-powered system observability and architectural clarity.
    • AI-enabled capability transfer. We lead structured handover sessions that combine AI-generated documentation, context, testing strategy, and architectural rationale.
    • Continuous AI-based improvement loop. We implement a feedback mechanism where AI continuously analyzes metrics and logs and publishes refactoring .NET reports that drive incremental improvements.

    You get a transparent, testable system that evolves with your business and continuously tracks cybersecurity risks.

    What you build next will no longer be limited by legacy constraints.

Our Process

Our Process

Our process combines built-in governance with controlled modernization — one iteration at a time.

01.

01. Discovery

We plan and deliver each modernization slice in short, time-boxed iterations, ensuring focused progress and immediate validation.

02.

02. AI-based backlog structuring

We use our accelerator to extract system logic, define dependencies, and generate a prioritized, actionable modernization backlog.

03.

03. Parallel execution of supporting tracks

We run compliance workflows in parallel with core refactoring for continuous alignment.

04.

04. Governance and privacy integration

We embed policy enforcement into every pipeline stage to maintain operational discipline from the start.

05.

05. Acceptance and freeze planning

Our team define acceptance criteria and freeze windows per module before the slice starts, so integration points are agreed while there is still time to change them.

06.

06. Independent slice delivery and live reporting

We track each slice as an autonomous unit, with audit trails automatically updated after each delivery.

  • 01. Discovery

  • 02. AI-based backlog structuring

  • 03. Parallel execution of supporting tracks

  • 04. Governance and privacy integration

  • 05. Acceptance and freeze planning

  • 06. Independent slice delivery and live reporting

Benefits

Our Benefits

01

Full-System Clarity from Day One

Devox reveals every dependency, hidden integration, and critical business logic visible from the very first stage and provides concrete artifacts that help you restructure code safely. Our AI-driven mapping and incremental slice-based analysis replace assumptions with a dependency map you can query.

02

Enterprise-Grade Stability

Each modernization slice goes through automated quality checks, governance controls, and acceptance gates — all with real-time reporting, rollback support, and audit-ready traceability.

03

Ownership, Enablement, and Strategic Advantage

Devox team manages the entire modernization lifecycle from start to finish, through full capability transfer. Your team receives an extensible system, with all operational knowledge seamlessly transferred.

Built for Compliance

Standards We Build Against

We refactor against the control requirements your industry is audited on: access controls, change traceability, and evidence retention are built into the pipeline, not added before the audit. Certification remains with your auditor; our job is that the evidence exists when they ask for it.

[Security & Data-Privacy Standards]

  • PCI DSS v4.0

  • ISO/IEC 27001:2022

  • GDPR

  • CCPA

  • SOC 2

  • FedRAMP Moderate

  • NIST 800-171

[Healthcare & Life-Sciences Controls]

  • HIPAA

  • HITECH

  • FDA 21 CFR Part 11

  • IEC 62304

  • ISO 13485

  • EU MDR

  • GxP

[Financial & Payment Frameworks]

  • SOX 404

  • GLBA

  • MAS TRM

  • NYDFS 500

  • PSD2

  • PCI DSS v4.0

  • SEC Reg SCI

[Government & Defense Assurance]

  • FedRAMP

  • DoD IL5

  • DFARS

  • CMMC 2.0 Level 2

  • NIST SP 800-53 Rev 5

[Critical-Systems Safety Standards]

  • ISO 26262

  • DO-178C

  • IEC 61508

  • DO-254

  • EN 50128

[AI Governance & Algorithmic Accountability]

  • EU AI Act 2024/1689

  • ISO/IEC 42001

  • NIST AI RMF 1.0

  • FTC Algorithmic Guidance

  • UK AI Assurance Principles

Case Studies

Our Latest Works

View All Case Studies
Zero-Downtime Cloud Migration with AI-Assisted Rollback Strategy Zero-Downtime Cloud Migration with AI-Assisted Rollback Strategy

Zero-Downtime Cloud Migration with AI-Assisted Rollback Strategy

A U.S. EdTech firm teamed up with Devox to rebuild its learning platform through an AI-driven, zero-downtime cloud migration that brought order, speed, and scale.

Additional Info

Core Tech:
  • AWS
  • GCP
  • Node.js
  • Python
  • Kubernetes
  • PostgreSQL
Country:

USA USA

Social Media Screening Platform Social Media Screening Platform
  • Backend
  • Frontend
  • Cloud Services
  • DevOps & Infrastructure

AI-Powered Social Media Background Check Platform for Risk-Free Hiring

An AI-driven platform for HR teams to automate social media background checks and mitigate hiring risks.

Additional Info

Core Tech:
  • .NET Core
  • Angular
  • Azure
  • Docker
  • GitLab CI/CD
  • Selenium Web Driver
Country:

USA USA

Private Community Engagement Platform Modernization Private Community Engagement Platform Modernization

Private Community Engagement Platform Modernization

Modernizing a mobile-first private community platform with gamified learning, real-time features, and multi-tenant support.

Additional Info

Core Tech:
  • C# / ASP.NET Core
  • Vue.js 2
  • Flutter
  • PostgreSQL
  • Redis
  • SignalR
  • AWS
Country:

USA USA

Testimonials

Testimonials

Carl-Fredrik Linné                                            Sweden

The solutions they’re providing is helping our business run more smoothly. We’ve been able to make quick developments with them, meeting our product vision within the timeline we set up. Listen to them because they can give strong advice about how to build good products.

Darrin Lipscomb Darrin Lipscomb
Darrin Lipscomb United States

We are a software startup and using Devox allowed us to get an MVP to market faster and less cost than trying to build and fund an R&D team initially. Communication was excellent with Devox. This is a top notch firm.

Daniel Bertuccio Daniel Bertuccio
Daniel Bertuccio Australia

Their level of understanding, detail, and work ethic was great. We had 2 designers, 2 developers, PM and QA specialist. I am extremely satisfied with the end deliverables. Devox Software was always on time during the process.

Trent Allan Trent Allan
Trent Allan Australia

We get great satisfaction working with them. They help us produce a product we’re happy with as co-founders. The feedback we got from customers was really great, too. Customers get what we do and we feel like we’re really reaching our target market.

Andy Morrey                                            United Kingdom

I’m blown up with the level of professionalism that’s been shown, as well as the welcoming nature and the social aspects. Devox Software is really on the ball technically.

Vadim Ivanenko Vadim Ivanenko
Vadim Ivanenko Switzerland

Great job! We met the deadlines and brought happiness to our customers. Communication was perfect. Quick response. No problems with anything during the project. Their experienced team and perfect communication offer the best mix of quality and rates.

Jason Leffakis Jason Leffakis
Jason Leffakis United States

The project continues to be a success. As an early-stage company, we're continuously iterating to find product success. Devox has been quick and effective at iterating alongside us. I'm happy with the team, their responsiveness, and their output.

John Boman John Boman
John Boman Sweden

We hired the Devox team for a complicated (unusual interaction) UX/UI assignment. The team managed the project well both for initial time estimates and also weekly follow-ups throughout delivery. Overall, efficient work with a nice professional team.

Tamas Pataky Tamas Pataky
Tamas Pataky Canada

Their intuition about the product and their willingness to try new approaches and show them to our team as alternatives to our set course were impressive. The Devox team makes it incredibly easy to work with, and their ability to manage our team and set expectations was outstanding.

Stan Sadokov Stan Sadokov
Stan Sadokov Estonia

Devox is a team of exepctional talent and responsible executives. All of the talent we outstaffed from the company were experts in their fields and delivered quality work. They also take full ownership to what they deliver to you. If you work with Devox you will get actual results and you can rest assured that the result will procude value.

Mark Lamb Mark Lamb
Mark Lamb United Kingdom

The work that the team has done on our project has been nothing short of incredible – it has surpassed all expectations I had and really is something I could only have dreamt of finding. Team is hard working, dedicated, personable and passionate. I have worked with people literally all over the world both in business and as freelancer, and people from Devox Software are 1 in a million.

FAQ

Frequently Asked Questions

  • How to preserve business logic, domain rules, and side effects during AI-driven refactoring?

    Legacy code contains decades of undocumented logic, so we approach discovery as an evidence-based process rooted in facts and telemetry. We parse every file into language-aware artifacts, ingest runtime traces and git co-change signals, and merge those signals into a queryable knowledge graph that returns exact transitive impact chains.

    Repo-level agents combine IDE-level reference tracking and LSP operations with precise graph queries so language-specific dynamics and conditional imports resolve to verifiable references. When the question requires explanation, the graph supplies the factual chain and a retrieval-augmented model synthesizes a clear impact narrative; every high-risk change includes a supporting evidence bundle for engineer sign-off and traceable releases.

    The outcome you get is a queryable map with auditable proofs that help teams pick safe slices and ship with confidence.

  • Can AI safely refactor legacy code without introducing regressions?

    When a platform carries live customers and SLAs, modernization becomes a process of precise changes and guaranteed continuity. We break the work into vertical, behaviorally complete slices that travel from repo to runtime through their own guarded pipeline: each slice arrives with an extracted behavioral baseline, AI-generated unit/integration tests, and an isolated CI/CD flow that enforces quality gates and policy checks before any merge or deploy.

    Deployment uses traffic-aware release patterns and full observability to validate every AI-assisted refactor in production with real-time safety checks. Rollbacks become declarative artifacts: a failed canary triggers an automated rollback path, capturing an evidence bundle that lets engineers restore prior behavior and analyze the root cause without interrupting unrelated slices.

    Data migrations and cross-slice coordination follow pragmatic patterns: a strangler-style façade for incremental cutover, dual-write with read-side verification where transactional guarantees matter, and migration harnesses that run alongside production traffic until parity metrics reach predefined thresholds. Each migration step includes an auditable runbook to ensure safe execution when refactoring legacy applications in production environments.

  • How do you validate and test AI-refactored legacy modules?

    We handle verification as a multi-layered process that links legacy behavior to refactored code. First, the current runtime behavior becomes the contract: golden-path snapshots record inputs, outputs, state changes, and side effects from production traces and targeted test runs, so the expected behavior exists as verifiable artifacts.

    Next, AI generates structured test suites that map directly to those behavioral contracts. Headless end-to-end flows for critical user journeys are produced from extracted semantics and historical traces, producing high-confidence coverage of both golden and edge cases. These tests become the declarative guardrail for every slice.

    Every proposed change runs through an isolated CI pipeline that enforces quality gates: static analysis, generated test pass rates, performance smoke checks, and policy compliance.

    After deployment, runtime verification closes the loop. Observability captures traces and metrics against the golden-path baseline, and automated drift detection compares live behavior to expected outcomes. Any deviation initiates a targeted investigation workflow and a rollback plan that contains the same evidence bundle, enabling rapid recovery with clear root-cause data.

    Human oversight remains central: generated tests and CI evidence accelerate engineering review and provide auditable proof for architects and product owners to approve releases.

  • What do you deliver in the first two weeks?

    Day 1 delivers a systems snapshot: the parsed repository, a queryable dependency graph, and a first pass at the modernization backlog. By the end of week two, you have a generated test set covering the golden paths of the highest-priority module.

    Early deliverables include a first set of AI-generated tests that immediately raise confidence in any follow-on refactor. Subsequent value compounds: each slice supports code migration automation by reducing technical debt, improving test coverage, and generating reusable templates that accelerate modernization cycles.

  • Is full automation possible, or does AI always need human oversight?

    AI becomes the apprentice that handles the repetitive, heavy lifting, while your engineers retain final sign-off. Every AI suggestion appears as a human-reviewable artifact with an evidence bundle. Pipelines enforce approval gates, and audit trails record provenance, ensuring technical ownership remains with your team.

    Skill uplift and trust-building happen through measurable feedback: generated tests and runtime assertions provide objective proof of parity; DORA-style metrics and pipeline telemetry quantify productivity shifts; and structured handovers transfer full operational knowledge to your team.

    Governance sits where it should — with your architects and SREs — via configurable risk tiers that require escalating approvals for higher-impact slices, plus the option to run AI agents inside your VPC or air-gapped environment so sensitive code never leaves your boundary. In practice, teams report more time for higher-value design work once the human-in-the-loop model proves its value in the first few slices.

  • How do we trust AI suggestions when the code behavior is not fully understood?

    Trust begins with evidence, not blind faith. When legacy systems hold decades of hidden logic, every AI suggestion must arrive wrapped in proof. That’s why each proposed refactor is backed by runtime traces that reveal what the code actually does before any change is made. Engineers don’t accept an AI’s word — they review concrete artifacts, see parity checks in action, and can trace behavior from input to output. Over time, this cycle builds confidence: AI accelerates discovery and refactoring, while humans remain the final sign-off.

  • Which AI tools or frameworks are best suited for legacy code refactoring?

    There isn’t a single “silver bullet” tool — it’s about assembling a stack that blends analysis, refactoring, and verification. Parsing engines that build abstract syntax trees uncover the structure. Machine learning models trained on code semantics detect hidden coupling. Generative AI helps produce tests, IaC templates, and candidate rewrites. CI/CD integration frameworks — GitHub Actions, Azure DevOps, or GitLab CI — enforce gates so nothing merges without validation. The best results come when these tools aren’t used in isolation but wired together into a repeatable process: discovery, suggestion, verification, release.

    Return to the overview of our AI solution accelerator for the full picture.

  • What are the limitations or failure modes of AI when refactoring large legacy systems?

    AI accelerates what it sees, but blind spots remain. It can misinterpret business intent hidden in undocumented workflows, or optimize syntax while missing subtle side effects that only surface in production. Models trained on common code patterns may struggle with rare domain logic or deeply customized architectures. There’s also the risk of over-automation: generating clean code that compiles but fails at preserving behavioral nuance. That’s why failure modes must be planned for — human review at critical gates. Limitations reinforce AI’s role as a powerful assistant rather than a substitute for architectural judgment.

  • How to structure prompts for generative AI to refactor legacy code effectively?

    Prompts act like design briefs for the apprentice. A vague “make this better” leads to shallow rewrites; a precise description of constraints yields useful output. Effective prompts capture three things: the scope (which module, which function, which dependency), the guardrails, and the intent (what outcome matters most — readability, migration, performance). Adding behavioral baselines — sample inputs, outputs, and expected side effects — gives AI a north star to follow.

Book a call

Want to Achieve Your Goals? Book Your Call Now!

Contact Us

We Fix, Transform, and Skyrocket Your Software.

Tell us where your system needs help — we’ll show you how to move forward with clarity and speed. From architecture to launch — we’re your engineering partner.

Book your free consultation. We’ll help you move faster, and smarter.

Let's Discuss Your Project!

Share the details of your project – like scope or business challenges. Our team will carefully study them and then we’ll figure out the next move together.







    By sending this form I confirm that I have read and accept the Privacy Policy

    Thank You for Contacting Us!

    We appreciate you reaching out. Your message has been received, and a member of our team will get back to you within 24 hours.

    In the meantime, feel free to follow our social.


      Thank You for Subscribing!

      Welcome to the Devox Software community! We're excited to have you on board. You'll now receive the latest industry insights, company news, and exclusive updates straight to your inbox.