Senior Full Stack Engineer

Ciklum is looking for a Senior Full Stack Engineer to join our team full-time in Bulgaria. We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live. About the role: As a Senior Full Stack Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. We are a fintech company building the payments infrastructure powering global B2B commerce. As we continue to grow, we are looking for a Senior Engineer to be part of our team in Bulgaria. Responsibilities: Take involvement and ownership of all aspects of product development, from ideation through architecture to implementation, testing, and continuous deployment Work closely with developers, product managers, and other stakeholders to ensure smooth integration and timely delivery of features Lead the design and implementation of RESTful APIs to enable seamless integration with various internal and external systems Optimize application performance to ensure low latency, high availability, and reliability Participate in design and code reviews and ensure adherence to coding standards and best practices Conduct thorough testing of backend components, write automated tests, and ensure high code quality and reliability Identify and address bottlenecks, bugs, and performance issues within the backend infrastructure Stay up-to-date with industry trends, emerging technologies, and best practices to continually improve the development process Contribute to the overall technical strategy and architecture of the product Drive engineering excellence across the team, setting the standard for code quality, testing, scalability, and security Requirements: 5+ years of professional experience in software development with strong expertise in Node.js, React, and TypeScript Strong hands-on coding skills with a passion for building scalable, reliable, and maintainable systems Solid understanding of software architecture, design patterns, and modern development practices (Agile, CI/CD, DevOps) Experience with RESTful API design and development Strong problem-solving skills and excellent communication abilities Comfortable in a fast-paced, dynamic environment where priorities can shift quickly Desirable: Experience in fintech, payments, or financial services Familiarity with cloud platforms such as AWS, Azure, or GCP Experience working with microservices or event-driven architectures What’s in it for you? Regular salary reviews based on performance Corporate events: webinars, offline parties, and meetups Internal Mobility Program Tailored education path (including full access to Udemy, certifications, etc.) 25 paid days off: 20 business days of vacation per calendar year + 5 undocumented sick leave days Additional health insurance 100% company-covered Multisport card, with discounts available for family members About us: At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress. Since expanding to Bulgaria in 2022, we’ve been building a fast-growing team that thrives on learning, collaboration, and innovation. Join us on this exciting journey and help shape the future of our delivery center. Explore, empower, engineer with Ciklum! Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum. #LI-MH1