Backend systems · Spain / CET
Senior Backend Engineer / Tech Lead
I help product teams build reliable backend systems, improve performance, and turn complex business logic into maintainable production services.
Java · Spring Boot · PostgreSQL · Redis · AWS · Microservices
Based in Spain. Available for remote backend engineering, tech lead roles, and selected freelance work.
Backend focus
I work mostly with backend-heavy products where correctness, performance, and reliability matter: SaaS platforms, marketplaces, analytics systems, internal tools, and business-critical APIs.
My main focus areas are backend architecture, PostgreSQL performance, caching strategies, production stability, and helping teams move from “it works somehow” to predictable, observable systems.
Engineering problems
I improve slow APIs, reporting flows, imports, and analytical calculations by finding real bottlenecks instead of guessing. That usually means better SQL, better indexes, batching, caching, safer concurrency limits, and cleaner service boundaries.
I work with PostgreSQL in production systems where query shape, indexing, partitioning, materialized views, and transaction boundaries directly affect product quality and infrastructure cost.
I design Redis and database caching strategies with explicit TTLs, invalidation rules, safety windows, and operational fallbacks, especially for systems where stale or missing data can create user-visible problems.
I help structure services, APIs, domain models, and integrations so that teams can keep adding features without turning the codebase into a trap.
I can support migrations between identity providers, backend auth flows, and infrastructure pieces while keeping production risk controlled.
I am comfortable in environments where requirements change, deadlines matter, and the engineering solution has to serve the product, not just look nice on a diagram.
Stack
Experience
I have spent more than 10 years building backend and product systems in startup, SaaS, marketplace, analytics, and business automation environments.
My work has included hands-on backend development, technical leadership, architecture decisions, production operations, database optimization, cloud deployment, and direct collaboration with product and business stakeholders.
Earlier in my career, I also worked in CTO/CEO-level roles, which helps me understand not only how systems are built, but also why they are built, what trade-offs matter, and how technical decisions affect product delivery.
Product domains
Some examples of product and system contexts I have worked with, anonymised to respect client and company confidentiality.
Netherlands · SaaS / marketplace / multi-tenant platform
Worked on backend systems for catalog management, sellers, buyers, RFQ, quotes, orders, pricing, invoicing, search, access control, and multi-tenant data isolation.
Focus areas
Europe · SaaS / analytics / operational reporting
Worked on backend services responsible for reporting, metrics, business rules, restaurant data processing, caching, and performance-critical calculations.
Focus areas
Belgium · business-critical backend systems
Worked on database-heavy backend flows where performance and reliability were important for everyday operations.
Focus areas
United States · ad-tech / analytics
Worked on calculation logic for advertising efficiency, recommendations, and reporting.
Focus areas
Travel industry · product leadership / CTO experience
Led a small engineering team and delivered a system focused on booking profitability, margin visibility, and operational decision support for travel clients.
Focus areas
Working style
I prefer practical engineering: clear APIs, simple domain models, measurable performance improvements, and solutions that the team can actually maintain after the first release.
I like systems that are boring in production: observable, predictable, and understandable when something goes wrong.
Contact
I’m open to remote backend engineering roles, tech lead work, and selected freelance projects.
CV and additional references are available on request.