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.
What 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.
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, while introducing 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, while translating 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, working directly with stakeholders and leading 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, applying 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.