Back-End Developer Services in Copenhagen

Hiring senior back-end talent in Copenhagen takes months. We embed experienced developers into your team, tooling, and sprint cycles immediately.

• Team extension. Senior engineers embed directly into your team, workflows, and rituals.
• Dedicated back-end team. Autonomous teams led by a tech lead own defined product domains or full backend roadmaps.
• Fast onboarding. We match engineers to your tech stack and domain for rapid time-to-value.
• Architecture leadership. Principal architects validate system designs and steer critical technical decisions alongside your CTO.
• Flexible scaling. Scale team size dynamically while retaining complete architectural knowledge inside your organization.

We build secure, enterprise-grade APIs and integrations to connect your platform with key partner systems.

• API design & development. Standardized REST and GraphQL APIs engineered for scalability, contract integrity, and performance.
• MitID authentication. Native integration of secure login and digital signing via certified MitID brokers.
• E-invoicing via NemHandel & Peppol. Automated processing for OIOUBL and Peppol e-invoicing compliance.
• ERP & accounting integrations. Robust data sync between core systems and accounting platforms like e-conomic and Dinero with full auditability.
• Payment pipelines. High-throughput payment processing with strict idempotency and fault-tolerant retry handling.

Legacy back-ends throttle velocity. We modernize monolithic infrastructure systematically without business disruption or downtime.

• Codebase & dependency analysis. In-depth technical audits to identify architectural bottlenecks and prioritize refactoring roadmaps.
• Runtime upgrades. Migration of legacy .NET Framework and Java codebases to current LTS versions for security and performance.
• Monolith decomposition. Incremental service extraction backed by comprehensive automated regression testing to de-risk cutovers.
• Database optimization. Schema refactoring, query optimization, and zero-downtime migration to managed cloud databases.
• CI/CD & test automation. Production-ready automated testing and delivery pipelines to maximize deployment frequency and safety.

We architect high-performance cloud back-ends designed for elasticity, resilience, and scale.

• Cloud architecture. Strategic selection of modular monoliths, microservices, and serverless patterns based on SLA, throughput, and domain boundaries.
• Event-driven processing. Decoupled, asynchronous pipelines engineered to guarantee message delivery, fault isolation, and peak load handling.
• Performance engineering. Rigorous load testing and profiling to systematically eliminate latency spikes and system bottlenecks.
• Observability. End-to-end tracing, structured logging, and APM metrics via OpenTelemetry for full system visibility.
• AI feature integration. Enterprise LLM pipeline integration, vector database indexing, rate limiting, and cost-control guardrails.

Enterprise compliance demands rigorous security. We embed robust security engineering into every commit and CI/CD workflow.

• Secure coding & reviews. Strict adherence to OWASP Top 10 standards with mandatory peer security reviews across all pull requests.
• Identity & access management. Robust OAuth 2.0 and OpenID Connect protocols with granular RBAC/ABAC authorization models.
• Supply chain security. Automated dependency vulnerability scanning and dynamic SBOM generation embedded in delivery pipelines.
• Data protection & secrets. Enterprise secrets orchestration alongside end-to-end encryption for data in transit and at rest.
• Automated guardrails. Automated SAST/DAST testing gated in deployment pipelines to prevent vulnerabilities from hitting production.