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Be | Shaping the Future Poland has a proven position of being a reliable partner for financial services organisations to analyse complex requirements, find solutions and implement them in their entirety, regardless of their complexity. Join our clients team responsible for the development and maintenance of a leading card payment authorization and switching software suite. Our work also includes components for card management back office solutions and fraud detection. We are seeking a Mid Application Developer skilled in modern C++ 17 to contribute to our integrated processing and software licensing solutions. This is a fully remote position. Responsibilities: Design, implement, and maintain high-performance C++ modules for real-time transaction authorization Develop low-latency trading/transaction processing paths with robust error handling Integrate with other systems and data stores (Oracle database) Implement security controls (encryption, authorization) and ensure compliance with PCI-DSS, PSD2, and other relevant standards Build and maintain unit, integration, and performance tests; participate in code reviews Optimize CPU/memory usage, latency, and throughput; profile and tune critical paths Collaborate with business analysts to translate risk rules and business logic into efficient C++ implementations Maintain documentation, version control practices, and CI/CD pipelines Troubleshoot production incidents and provide timely responses Requirements: Strong proficiency in modern C++ (C++11/14/17/20) Experience with real-time or near-real-time financial systems ; low-latency programming and high-throughput design Understanding of financial instruments, settlement, risk, and transaction workflows; knowledge of authorization/risk checks Experience with secure coding practices, cryptography basics, and secure storage Knowledge of databases and data structures Testing and quality discipline: unit tests, integration tests, performance testing; continuous integration Proactive, collaborative, with strong problem-solving and communication skills Knowledge of the German language is a plus Our offer: Competitive remuneration on B2B contract Option to activate Medicover and Multisport on preferential terms Access to Mindgram – mental health & well-being platform Free gym at Q22 Personal development – internal online / onsite DevTalks Referral bonus program International environment