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Senior Full Stack Java Developer (Spring Boot + React) About the Role We are looking for a Senior Full Stack Java Developer to join our engineering team and help build scalable, cloud-native applications used by millions of users worldwide. You will work across the full technology stack, designing backend services with Java and Spring Boot while contributing to modern React-based frontend applications. We're looking for someone who enjoys solving complex technical challenges, writing clean and maintainable code, and collaborating closely with product, QA, DevOps, and mobile teams. Responsibilities Design, develop, and maintain scalable backend services using Java and Spring Boot. Design and implement RESTful APIs and microservices. Work with MongoDB and other data storage technologies. Participate in system architecture and technical design discussions. Optimize application performance, scalability, and reliability. Write clean, maintainable, and well-tested code. Review code for other developers. Troubleshoot production issues and continuously improve system stability. Build modern, responsive frontend applications using React and TypeScript. Required Skills 5+ years of professional experience in Java development. Strong knowledge of Java 21+. Extensive experience with Spring Boot. Experience designing and building REST APIs. Strong understanding of microservices architecture. Experience with React. Experience with TypeScript and modern JavaScript (ES6+). Solid knowledge of MongoDB. Experience with relational databases such as PostgreSQL Experience with Git. Familiarity with CI/CD pipelines. Experience working with cloud platforms (AWS). Experience with Maven and/or Gradle. Strong understanding of software design principles, clean architecture, and design patterns. Experience writing unit and integration tests. Excellent problem-solving and communication skills.
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Most developer ads you'll see are written in English: 18,397 of the 24,795. That doesn't tell you whether the job itself requires you to speak English or work in English daily, so read each posting carefully. Don't assume the language of the ad matches the language of the team.
The employers posting the most developer roles are Link Group (369 jobs), Upvanta (257), jobgether (226), and OfferZen (212). If you're applying to any of these, research their hiring patterns. They move fast and post often, which means they're either scaling hard or replacing people who didn't fit.
In your interview, expect this: 'Walk me through the last time you had to debug something that took you more than an hour. What was it, what did you try first, and what would you do differently?' Hiring managers ask this to see if you think systematically or just try random fixes. Have a real example ready with specifics.