Java Software Engineer

Ohpen

DESCRIPTION Would you like to leave your mark in the truly booming cloud-native & fin-tech industry? Would you like to show your ideas and bring them to life?     Ohpen is on the lookout for a skilled Engineer to join the team and help us build and maintain the product and its applications. There is where you come into the picture! BRIEFING We're not looking for just another Java developer. We want someone who has internalized the discipline of languages like Rust, C++, and Haskell — ownership semantics, zero-cost abstractions, fearless concurrency, algebraic types, immutability-by-default — and brings that rigour to a production Java codebase. You'll join one of our self-governing squads Bratislava or Zilina that owns its domain end-to-end in a cloud-native fintech platform. Most architectural decisions are made inside the squad, so your opinions on correctness, performance, and code design actually matter here. The daily language is Java 21+ / Spring Boot, but the way you think about the code is what sets you apart. As English is our primary working language, we expect candidates to communicate fluently in English at a professional level. We also value a willingness to work with AI technologies.  ABOUT YOU * 5+ years of professional backend experience, with meaningful time spent in at least one of: Rust, C++, Haskell — or demonstrable deep knowledge of their core principles * Strong, opinionated understanding of memory models, ownership, type systems, and functional programming concepts * Production fluency in Java (17+) and Spring Boot — or the confidence to ramp up quickly given your systems background * Experience with or genuine interest in AWS, Terraform, and delivery automation * Comfortable communicating daily in English

IMC

IMC is building a new Power and Gas Trading business in Aarhus, Denmark, the hub for power and gas trading in Europe. Backed by one of the world’s most successful trading firms, this new venture combines the energy and autonomy of a startup with the global reach, stability, and expertise of IMC’s 30+ years in trading. We are building a strong, independent Aarhus-based team with local leadership, supported by IMC’s world-class technology, quantitative research, and trading infrastructure. To achieve our ambitious hiring goals, we are seeking strong Software Engineers to join the team and play a pivotal role in helping us grow this new business. Your Core Responsibilities: * Build, as part of a team, a full technology stack that supports power and gas trading, including exchange connectivity, trading systems, trading strategies, data analysis, and pricing. We are looking for strong developers that specialised in back-end, algorithms, trading systems, execution systems or other relevant domains * Maintain and improve the tech stack in collaboration with trading * Train new joiners Your Skills and Experience: * Strong academic background, preferably in computer science or a quantitative field * 2+ years of professional experience as a software engineer * Experience European power and gas trading industry is a plus * Strong programming skills in Java. Experience with other relevant programming languages such as Python or C++ is considered a plus * Excitement for working in a start-up environment and a variety of systems/platforms/tools * The ability able to work on greenfield projects under minimal supervision and to take full ownership of the applications you build * A high degree of flexibility and adaptability: willing and able to deal with uncertainty and ambiguity in a rapidly evolving environment * Fluency in English About Us IMC is a global trading firm powered by a cutting-edge research environment and a world-class technology backbone. Since 1989, we’ve been a stabilizing force in financial markets, providing essential liquidity upon which market participants depend. Across our offices in the US, Europe, Asia Pacific, and India, our talented quant researchers, engineers, traders, and business operations professionals are united by our uniquely collaborative, high-performance culture, and our commitment to giving back. From entering dynamic new markets to embracing disruptive technologies, and from developing an innovative research environment to diversifying our trading strategies, we dare to continuously innovate and collaborate to succeed.

Semicon Service Nordic AB

Job Description Our client is seeking a motivated and enthusiastic Junior Java Software Engineer to join a dynamic development team responsible for building and maintaining modern cloud-based software solutions. This opportunity is ideal for an early-career developer who is passionate about technology, enjoys solving complex problems, and thrives in a collaborative Agile environment. The successful candidate will contribute to the design, development, deployment, and support of microservice-based applications while working alongside experienced professionals in a high-performance and innovation-driven culture. The role follows a DevOps approach, providing exposure to the full software lifecycle from development and prototyping to operations and continuous enhancement. Key Responsibilities Design, develop, and implement software applications in alignment with established development standards and engineering best practices. Participate in the architectural design and technical planning of new digital services and application features. Deploy, monitor, support, and maintain production applications to ensure optimal performance and reliability. Investigate technical issues, troubleshoot application defects, and implement effective solutions. Contribute to continuous improvement initiatives focused on enhancing software quality, functionality, maintainability, and cost efficiency. Develop scalable microservices and cloud-based solutions using modern Java technologies and frameworks. Collaborate with cross-functional teams during sprint planning, development, testing, and delivery activities. Follow coding standards, software design principles, and development methodologies to ensure high-quality code. Participate actively in Agile ceremonies and support successful sprint execution. Continuously evaluate existing processes and propose improvements that drive efficiency and innovation. Required Skills Java 8 or later Spring Framework Spring Boot Microservices Architecture AWS (Amazon Web Services) JMS (Java Message Service) Asynchronous Programming Test Automation Frameworks Application Development Software Design DevOps Practices Troubleshooting and Maintenance Agile Methodologies Coding Best Practices (DRY Principles) Preferred Skills IT Security Public Key Infrastructure (PKI) React ELK Stack / Kibana Grafana Cloud-Native Development Continuous Improvement Practices Required Qualifications University degree in Computer Science, Software Engineering, Information Technology, or a related field. Minimum one year of hands-on experience developing applications using Java 8 or later. Strong knowledge of Spring Framework, Spring Boot, and Microservices Architecture. Experience with AWS cloud services.