OverviewAtQ-tech, we’re looking for aSenior Java Engineerto join a integral Saa S 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 becomethe Java reference point : someone who can set technical direction, build new services withJava + Spring + Postgre SQL, and help elevate the platform’s engineering standards. There’s also some existing functionality inNode.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 doDesign and build backend services using Java + SpringBring architectural vision, patterns,



and best practicesHelp migrate existing Node.Js components into the new Java stackWork with clean/hexagonal architecture and rich domain modelsCollaborate with a senior team and a technically strong CTOMake autonomous technical decisions that shape the platformRequirements6+ years of experience working withJavain complex or high‑reliability environmentsStrong expertise withSpringand the ability to design services from scratchPostgre SQL experience is a must(data modelling, performance, migrations, consistency)Solid understanding ofclean/hexagonal architecture, domain‑driven thinking and tactical patternsStrong testing mindset and familiarity with CI/CD and engineering best practicesAbility to review, challenge and elevate the team’s technical decisionsExperience working with existing codebases and migrating functionality is a plus (some parts currently inNode.Js )Autonomy to make technical decisions without constant oversightGood communication skills and a collaborative mindsetBased in Spain (remote)Experience collaborating with distributed and multicultural teamsWhat the role offersBecome the go‑to Java expert in the companyBuild critical components from scratchA real technical challenge with direct product impactA stable environment focused on doing things properlyRemote work from anywhere in Spain + optional offices in several cities

📌 Senior Java Engineer (Remote Within Spain) (Madrid)
🏢 Q-Tech
📍 Madrid