Services
Backend & API Development
The foundation your application runs on, designed before it's coded, tested before it's shipped.
Who this is for
Backend systems are where fragile applications break. If your API was never designed (just grown organically over time), every new feature is harder than the last, every integration is a risk, and your frontend developers spend most of their time working around inconsistencies. That's not a frontend problem.
- Your API was never designed; it was just added to over time, and it shows
- Adding a new feature routinely breaks existing ones
- You depend on third-party services that go down and take your product down with them
- Your database schema is a set of guesses that made sense two years ago
- Performance degrades under real load because queries were never optimized
- You need to expose an API to external developers or partners but don't have one worth publishing
What we deliver
A backend that your frontend can trust, consistent, documented, and built to be extended without fear.
REST and GraphQL APIs
Designed before they're coded. We write the OpenAPI specification first, agree on it with your team, then implement, so the contract is never a surprise.
- OpenAPI / Swagger documentation
- Versioning strategy from day one
- Consistent error formats
- Rate limiting and auth
Database architecture
Schema design that reflects your domain, not your first guess. We model the data correctly so queries are fast and migrations are manageable.
- Relational (PostgreSQL, MySQL) and document (MongoDB) databases
- Index strategy and query optimization
- Migration scripts and rollback plans
- Read replicas and caching layers
Third-party integrations
Integrations that don't bring your system down when the vendor has an outage. Retry logic, circuit breakers, and fallback behavior built in.
- Payment providers (Stripe, Tamara, HyperPay)
- CRM and ERP systems
- Communication services (email, SMS, push)
- Document storage and CDN
Background jobs and workflows
Async processing for tasks that shouldn't block a user request: file processing, report generation, notifications, and scheduled operations.
- Job queues (Celery, BullMQ, Sidekiq)
- Scheduled tasks and cron jobs
- Event-driven workflows
- Dead-letter queues and retry policies
How it works
We design the system on paper before writing a line of code. This is the single most important practice in backend development and the one most skipped by teams in a hurry.
- System mapping (1–2 weeks). We document the full scope: data entities, API endpoints, integrations, background jobs, and performance requirements. Gaps and ambiguities are resolved in writing before design starts.
- API and data design (1–3 weeks). We produce the OpenAPI spec and database schema. You review and sign off. This document becomes the contract for the build phase.
- Implementation (6–20 weeks). Built in milestones with automated test coverage for business logic. Each milestone delivers a working, testable slice, not a monolithic delivery at the end.
- Integration testing. End-to-end tests covering your key user flows. Load testing to verify performance under expected traffic.
- Documentation and handoff. Full API documentation, architecture diagram, deployment runbook, and a data dictionary. Your team or any future engineer can understand and extend the system.
Indicative pricing
Backend scope varies significantly based on the number of integrations, data complexity, and performance requirements.
API design and greenfield build
€30,000–€120,000+
What it covers: A clean, well-documented API for a defined scope. Includes database design, core business logic, one or two key integrations, and documentation. No legacy system involved.
Examples: Backend for a new internal tool, API layer for a mobile app, integration service between two systems.
Full backend for a product
€100,000–€400,000+
What it covers: Complete backend for a product with multiple user roles, billing, several third-party integrations, async processing, and production-grade monitoring. Built to handle growth.
Best for: SaaS products, marketplaces, or platforms where the backend is the core of the product.
Legacy backend refactor
€40,000–€200,000+
What it covers: Systematic cleanup of an existing backend: API redesign, schema migration, removal of dead code, performance fixes, and documentation. Delivered incrementally to minimize disruption.
Note: If the codebase requires rescue-level intervention first, see our Code Rescue service.
Ranges are indicative. Final fees depend on scope defined in discovery.