Services
Backend engineering built for production.
I work with startups, SMEs and engineering teams on backend, infrastructure and integration projects. Custom quotes, no fixed rates.
Backend & APIs
Backend system design and development
Scalable REST APIs, microservices and system architectures designed for production from day one. I prioritize clean code, well-defined API contracts, and business logic decoupled from infrastructure.
Includes
- Backend architecture design
- REST API development and documentation
- Automated testing (unit, integration)
- Code review and refactoring of existing code
Integrations
Third-party, webhooks and legacy systems
Integration with provider APIs, availability systems, industry webservices and any external service. I normalize interfaces, contain each third party quirk in its own adapter, and build resilience against their failures.
Includes
- Integration analysis and design
- Implementation with robust error handling
- Testing with mocks and staging environments
- Integration monitoring and alerting
Performance & infrastructure
Systems that hold up under real load
Diagnosing and optimising systems under load: where the time actually goes, what work can be skipped entirely, and what is worth caching. Infrastructure declared as code with Terraform, reproducible environments with Docker, and horizontal scaling strategies.
Includes
- Performance analysis and critical path review
- Query optimisation and caching strategy
- Infrastructure as code (IaC)
- Dev/staging/prod environment configuration
Technical consulting
Architecture, decisions and mentoring
External perspective for engineering teams that need support in architecture decisions, deep code review, or technical mentoring. No selling extra hours — just honest technical judgment focused on real impact.
Includes
- Architecture review and recommendations
- Deep code review with actionable feedback
- Technical mentoring for senior and mid engineers
- Technical due diligence for investment or acquisition
Process
How I work
No surprises. From first call to delivery.
First call (30 min)
We understand the problem, technical context and team. No commitment.
Technical proposal
Scope, approach, technologies and time estimate. We adjust before starting.
Iterative development
Incremental deliveries, continuous feedback and reviewable code at all times.
Delivery and support
Complete technical documentation, orderly handover and post-delivery support.
FAQ
Frequently asked questions
Do you work by the hour or by project?
Primarily by project with defined scope. For consulting and code review, also by monthly retainer. The model depends on what makes most sense for each client.
What size company do you work with?
From technical founders who need a solid backend from scratch, to SMEs with teams of 5-20 engineers who need specific technical support or third-party integrations. I do not work with large corporations without direct contact with the technical team.
Can you integrate into an existing team?
Yes. I can work as an external engineer integrated into the team, using their tools, processes and methodologies. I can also do code review without participating in development.
What languages can you work in?
Spanish, English, Catalan and German. No problem with international teams.
How does pricing work?
Customized for each project. After the first call I send a proposal with scope, time estimate and cost. Full transparency from the start.
Contact
Let's talk
Technical consulting, mentoring for engineers, and classes in programming, architecture and mathematics.