Overview At Q-tech , we’re looking for a Senior Java Engineer to join a general SaaS product that’s scaling fast and moving into a more mature, reliability‑focused phase.
The platform handles a high volume of data and workflows used by customers across multiple countries. The team is strengthening its foundations to ensure stability, consistency and long‑term scalability — and they’re looking for someone who can take a leading role on the Java side.
You’d become the Java reference point : someone who can set technical direction, build new services with Java + Spring + PostgreSQL , and help elevate the platform’s engineering standards. There’s also some existing functionality in Node.js , and part of the work involves gradually moving that logic into the new Java‑based architecture.
This isn’t a “ship fast and patch later” environment. Quality matters: clean architecture, solid testing, strong patterns, observability, and a product that needs to behave predictably for demanding clients.
What you’ll do
Design and build backend services using Java + Spring
Bring architectural vision, patterns, and best practices
Help migrate existing Node.js components into the new Java stack
Work with clean/hexagonal architecture and rich domain models
Collaborate with a senior team and a technically strong CTO
Make autonomous technical decisions that shape the platform
Requirements
~6+ years of experience working with Java in complex or high‑reliability environments
~ Strong expertise with Spring and the ability to design services from scratch
~ PostgreSQL experience is a must (data modelling, performance, migrations, consistency)
~ Solid understanding of clean/hexagonal architecture , domain‑driven thinking and tactical patterns
~ Strong testing mindset and familiarity with CI/CD and engineering best practices
~ Ability to review, challenge and elevate the team’s technical decisions
~ Experience working with existing codebases and migrating functionality is a plus (some parts current
📌 Senior Java Engineer (España)
🏢 Q-Tech
📍 España