Ciklum is looking for a Senior Full Stack Engineer to join our team full-time in Ukraine. 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 Money movement team. Our client is a fast-growing, profitable, well-funded and dynamic global payments company. It is serving thousands of corporates and millions of end-users (payment receivers), in over 200 countries. Responsibilities: Full Stack development to meet customer’s business needs and implement components according to modern software development environment (microservice architecture) Taking part in the decision-making process in design application architecture, solution development, architecture and code review Develop and review feature design documents and provide inputs/update to specifications for the solution Design and implement a set of various types of tests (unit, integration, functional, etc) Proactive position in solution development, processes improvements Working in an international distributed team in an Agile environment Communicate with PMs, engineers, Architects, QA and other colleagues and stakeholders Delivering the product roadmap and plannings To use high coding standards, software best practices and write highly testable, automatable and performant code over the whole SDLC Requirements: Experience in software development for more than 5 years Excellent knowledge in: Clean code practices, OOP, and OOD Programming:Paradigm & Principles (OOP, SOLID, DDD, TDD, BDD) Database theory (RDBMS, NoSQL) Code testing practices Algorithms Data structures Architectural, Enterprise, and Design Patterns Security patterns, Reverse engineering resistance, Common attacks types (OWASP) Understanding of network interactions:protocols conventions (e.g. REST, RPC) authentication and authorization flows standards and practices (e.g. oAuth, JWT) Excellent knowledge and experience in C#, .NET, and React Practical commercial experience with:REST API development Distributed systems and microservices .NET Framework, .NET Core, ASP.NET (Core, MVC, WebAPI) Testing frameworks (e.g. NUnit, XUnit, MSTest) ORM (e.g. Entity Framework, Dapper) RDBMS (e.g. SQL Server, MySQL/MariaDB, PostgreSQL) Key-value storages - strong experience with Redis Messaging systems (e.g. RabbitMQ, Azure ServiceBus, Apache Kafka, ActiveMQ, AWS SQS, Google Pub/Sub) Web Servers Version control systems (GIT) Continuous Integration tools (e.g. Gitlab Pipeline, Jenkins, Azure DevOps) NoSQL (e.g. MongoDB, ElasticSearch, CouchDB) Kubernetes Сloud platforms such as AWS or Azure AI (including coding and building agents) Troubleshooting, profiling, and debugging applications Experience working in Agile/Scrum environments What`s in it for you? Strong community: Work alongside top professionals in a friendly, open-door environment Growth focus: Take on large-scale projects with a global impact and expand your expertise Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies Flexibility: Enjoy radical flexibility – work remotely or from an office, your choice Care: We’ve got you covered with company-paid medical insurance, mental health support, and financial & legal consultations 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. As one of Ukraine’s largest IT companies and a top employer recognized by Forbes, we’ve spent over 20 years delivering meaningful tech solutions. We proudly support diverse talent and military veterans, recognizing their unique skills and perspectives they bring to shaping the future. 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-AV3