Java Software Engineer

Location: Warsaw, Mazowieckie, Poland; Limassol, Cyprus; Sofia City, Bulgaria Workplace: hybrid We are a leading trading platform that is ambitiously expanding to the four corners of the globe. Our top-rated products have won prestigious industry awards for their cutting-edge technology and seamless client experience. We deliver only the best, so we are always in search of the best people to join our ever-growing talented team. We are a leading trading platform that is expanding to the four corners of the globe. Our top-rated products have won prestigious industry awards for their cutting-edge technology and seamless client experience. We deliver only the best, so we are always in search of the best people to join our ever-growing talent team.    We are currently growing our Backend Team and looking for great Engineers with an interest in trading to join us! Our Engineering team plays a pivotal role in ensuring the robustness, speed, and security of our product. Dedicated to enhancing performance, providing a best-in-class user experience, ensuring compliance, and safeguarding data, the team's efforts directly impact our ability to offer clients a seamless and secure trading journey.   We believe great engineering talent not only delivers excellent code, but also lives our values. We are looking for someone who is eager to go fast, willing to innovate and grow, who knows how to listen, respect and support, strives to exceed client expectations, and takes full ownership to achieve real results. Core responsibilities: Design and build scalable, low-latency, and high-performance backend services Develop distributed and asynchronous systems ensuring reliability and fault tolerance Optimise performance across JVM, databases, caching, and networking layers Apply security best practices in handling client PII and financial transactions Use event-driven architectures and modern messaging solutions (e.g. Kafka) Collaborate with cross-functional teams to align architecture with business needs Maintain high code quality through testing, code reviews, and CI/CD practices Leverage AI tools to accelerate development, testing, and delivery What you will need: Experience & domain knowledge: Proven experience in FinTech, Banking, or related financial domains Strong understanding of distributed systems architecture and the client–server model Ability to design and maintain scalable, low-latency, high-performance systems Solid knowledge of concurrency, multithreading, and asynchronous programming Awareness of security best practices in handling PII and financial transactions Basic understanding of network protocols and troubleshooting Experience working in a product-led fast-paced environment as a team player Technical skills: Java and Spring: Advanced knowledge of Java Core technologies and the Spring framework Data Mastery: Proficiency with SQL databases, ensuring optimal performance, structure, and replication Concurrency & Async programming: advanced understanding and hands-on experience in asynchronous programming methods. Events streaming: Understanding of the event driven architecture (Kafka or similar solutions). Operational Proficiency: Understanding and hands-on experience with Ops activities, Kubernetes, pipelines, Fit Flow and modern CI/CD patterns and strategies AI tools: ability to effectively use AI technologies in engineering work e.g. applying AI for coding assistance, debugging, testing, documentation, and optimisation of workflows Soft skills: Communication: Effective communication skills, especially with teams responsible for security, operations and product Analytical thinking: Ability to tackle and investigate complicated problems and convert it to the task Adaptability to Rapid Changes: Demonstrated capability to adjust to quick technological shifts and evolving business requirements Ownership and Accountability: Readiness to take ownership of tasks, issues as well as demonstrate accountability of the results and outcome Nice to have: Performance : Knowledge of JVM performance optimization practices No-SQL: Experience working with no-SQL databases is a big plus In-memory storage : Strong knowledge of in-memory cache solutions What you will get in return: Competitive salary and annual performance-based bonus Generous annual leave policy Health insurance and pension fund, with additional benefits depending on location Hybrid working model (3 days from office) or fully remote across the country of employment Workation policy (30 days remote from anywhere in the world) Two additional paid days per year dedicated to volunteering What you will get in return: • Competitive Salary: We believe great work deserves great pay! Your skills and talents will be rewarded with a salary that makes you feel valued and motivated. • Work-Life Harmony: Join a company that genuinely cares about you - because your life outside of work matters just as much as your time on the clock. #LI-Hybrid • Generous Time Off: Need a breather? Our annual leave policy lets you recharge and enjoy life outside of work without a worry. • Employee Referral Program: Love working here? Share the love! Bring your talented friends on board and get rewarded for growing our awesome team. • Comprehensive Health & Pension Benefits: From medical insurance to pension plans, we’ve got your back. Plus, location-specific benefits and perks! • Workation Wonderland: Live your digital nomad dreams with 30 extra days to work remotely from anywhere in the world (some restrictions apply). Adventure awaits! • Volunteer Days: Make a difference! Take two additional paid days each year to support causes you care about and give back to the community. Be a key player at the forefront of the digital assets movement, propelling your career to new heights! Join a dynamic and rapidly expanding company that values and rewards talent, initiative, and creativity. Work alongside one of the most brilliant teams in the industry. Applicable for Poland: Our company has an Internal Reporting Procedure. It is available from the Human Resources Department upon request hr@capital.com. You may report a violation referred to in the Procedure under the terms specified therein.