Banking SPA Architecture Barcelona

Joined a well-known Barcelona bank expecting a supporting role. Two months in, the Tech Lead left. I inherited two poorly built SPAs and led the architecture of a new one applying Hexagonal Architecture, building scaffolding for a 20-person unit and stepping fully into a Tech Lead role.

What started as a frontend engineering role quickly evolved into something far more demanding. Two months in, the Tech Lead left the project leaving two SPAs with severe technical debt: logic embedded directly in components, no separation of concerns, and no clear architecture. On the new SPA that I had already started building independently, I applied everything from the previous project: Hexagonal Architecture, DDD, clean code and Doc as Code. I built scaffolding that could be reused across the entire business unit of ~20 engineers, onboarded two junior developers into the new architecture, wrote full documentation and led the technical direction of the frontend. Beyond architecture, I took on the full Tech Lead responsibilities: leading Scrum ceremonies, refining and estimating work, aligning with UX/UI, communicating directly with the client, supporting the QA team on pipeline issues and test case reviews, managing deployment guardia and representing the frontend perspective in backend and client meetings.