Product architecture
Turn ambiguous requirements into technical direction, clear boundaries and delivery plans.
Javier Costa
Tech Lead focused on product architecture, backend systems and practical AI.
I help teams turn unclear product needs into software they can ship, operate and evolve.
Download resumeWhat I Do
Backend systems
Design and evolve APIs, services and data flows that remain understandable as products grow.
Reliability
Improve observability, failure handling and the parts of a system that cause trouble in production.
Practical AI
Use LLMs and automation when they remove real work or unlock a useful product capability.
- Focus
- Product architecture, backend systems, reliability, practical AI
- Technologies
- TypeScript, NestJS, Node.js, Python, Angular, Vue, AWS, Docker
- Engineering
- Service architecture, APIs, observability, fault tolerance, data modelling, clean architecture
Selected Work
Healthcare workflow automation
A healthcare operations team relied on spreadsheets and email for a fragile manual process. Designed and developed the replacement platform end to end, including its architecture, AWS infrastructure and data model, giving the team a workflow that was easier to operate and extend.
Consent management browser extension
Led a five-person team evolving a consent-management extension under CSP, storage and cross-browser constraints. Restructured the product around clearer boundaries while keeping delivery moving under changing platform requirements.
Reliability in a high-usage crawling product
Led cross-cutting changes to architecture, observability and failure handling in a crawling product used daily by thousands of customers, reducing customer-reported issues and making later product changes safer.
Experience
Blue Trail Software
Tech Lead — Product Architecture, Reliability & AI Systems
August 2025 – PresentLed the technical evolution of a web crawling product used daily by thousands of customers.
- Improved reliability and reduced customer-reported issues through changes to architecture, observability, fault tolerance and execution consistency.
- Introduced AI-assisted engineering workflows for a lean team.
Tech Lead — Product Engineering & Browser Extension
November 2024 – August 2025Led a five-person team evolving a consent-management browser extension from a limited tool into a more robust product ready for cross-browser expansion.
- Defined an architecture that balanced platform constraints, delivery speed and long-term maintainability.
- Translated ambiguous business needs into sustainable technical decisions.
Tech Lead & Solutions Architect
April 2023 – October 2024Designed and developed a healthcare automation platform that replaced manual spreadsheet- and email-based operations.
- Owned architecture, AWS infrastructure, data modelling and technical decisions end to end.
- Worked directly with stakeholders and led the development team through delivery.
Senior Full Stack Engineer
March 2021 – April 2023Helped restructure a monolithic platform into roughly ten services.
- Introduced TypeScript and NestJS to standardize backend development and developed shared libraries that reduced duplication across projects.
- Mentored junior engineers and launched weekly Tech Talks to strengthen knowledge sharing.
ITI — Instituto Tecnológico de Informática
Full Stack Engineer — R&D
February 2018 – March 2021Developed web applications and technical tools for national and European R&D projects across AI, IoT and blockchain.
- Worked across frontend and backend with Node.js, Python, Angular and Vue.
- Applied clean architecture practices and Docker-based workflows in projects with evolving requirements.
Education
Universitat Politècnica de València
MSc in Software Engineering, Formal Methods and Information Systems · BSc in Informatics Engineering · 2014–2020
Contact
Building a product with difficult technical decisions ahead?
I help teams shape the architecture, improve reliability and apply AI where it solves a real problem.