Description Ciklum is looking for a Middle .NET Developer 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 Middle .NET Developer, become a part of a cross-functional development team engineering experiences of tomorrow. UA team is developing Payment system and solutions for our online entertainment platform. The role of Middle .NET Developer means that you will join and influence a project which is being created using the latest technologies (C#, .NET/ Core, Docker, K8s, on-premise and cloud solutions, RabbitMQ, SQL Server and NoSQL) SOA, multi-tier distributed and highly scalable architecture, and test automation. We are a very Agile team that uses Scrum and common sense to assist in development. Responsibilities Design, develop, and maintain scalable and reliable server-side applications using the .NET framework and related technologiesWillingness to learn C#Collaborate with cross-functional teams, including front-end developers, product managers, and designers, to understand requirements and translate them into technical specificationsDevelop and implement efficient and secure RESTful APIs and microservices to support client applications and integrationsWrite clean, testable, maintainable, and well-documented code following software development best practices and coding standardsPerform thorough testing and debugging of backend applications to ensure high quality and reliabilityOptimize application performance and scalability through code optimizations, caching strategies, and database optimizationsParticipate in code reviews to ensure code quality, adherence to architectural guidelines, and best practicesTroubleshoot and resolve issues reported by users or identified through monitoring and logging systemsStay updated with the latest trends, tools, and technologies in backend development and actively contribute to improving development processes and efficiency Requirements Strong understanding of object-oriented programming (OOP) principles and design patternsProficiency in SQL databases both in writing queries and optimizing performanceUnderstanding of software development best practices, including code reviews, unit testing, continuous integration, and delivery pipelinesExcellent problem-solving and analytical skills, with the ability to debug and resolve complex issuesEffective communication skills in English, both verbal and written, with the ability to work collaboratively in a team environmentExperience in software development for more than 3 yearsExperience working in Payments teams and PSP integrations such as: PagoEffectivo, Directa24, Astropay, Pix, Monet would be indicative PSPsStrong knowledge in Computer Science, Computing Theory: Paradigm & Principles (OOP, SOLID)Database theory (RDBMS)Design PatternsCode testing practicesData structures Understanding of network interactions: Protocols, conventions (. REST, RPC)Authentication and authorization flowsStandards and practices (. oAuth, JWT) Strong knowledge and experience in C# and .NET (more than 2 years)Practical commercial experience with: .NET Framework, .NET Core, (Core, MVC, WebAPI) (more than 2 years)RESTful services development (, Core)RDBMS (. SQL Server, MySQL, PostgreSQL) (more than 1 year)Messaging systems (. RabbitMQ, Azure ServiceBus, Apache Kafka, AWS SQS)ORM (. Entity Framework, Dapper) (more than 1 year)Testing frameworks (. NUnit, XUnit, MSTest) Experience with: Version control systems (GIT)Continuous Integration tools (. TeamCity, GitLab Pipeline, Jenkins, Bamboo)DockerAgile software processes and technologiesCode Review processRefactoring process Desirable Experience with cloud platforms such as Microsoft Azure or Amazon Web Services (AWS)Strong background in backend development, with experience in languages such as C#, Python, Go, Java, or similarKnowledge of NoSQL, PostgreSQL, SQL Server databasesExperience in design and implementation of distributed systems that comprise of multiple domain-oriented servicesUnderstanding of front-end development technologies, including HTML, CSS, and JavaScriptFamiliarity with version control systems, preferably GitFamiliarity with containerization technologies like Docker and orchestration tools like KubernetesWe don’t expect you to be an expert in all these technologies but would anticipate experience with some combined with a curiosity for others: etcd, Consul, Redis, Apache Kafka, RabbitMQ, gRPC, Orleans What's in it for you Care: your mental and physical health is our priority. We ensure comprehensive company-paid medical insurance, Mental Health programs, as well as financial and legal consultationsTailored education path: boost your skills and knowledge with our regular internal events (meetups, conferences, workshops), Udemy license, language courses and company-paid certificationsGrowth environment: share your experience and level up your expertise with a community of skilled professionals, locally and globallyOwn your schedule – you are the one to decide when to start your working day. Just don’t miss your regular team stand-upOpportunities: we value our specialists and always find the best options for them. Our Internal Mobility Program helps change a project if needed to help you grow, excel professionally and fulfill your potentialGlobal impact: work on large-scale projects that redefine industries with international and fast-growing clientsWelcoming environment: feel empowered with a friendly team, open-door policy, informal atmosphere within the company and regular team-building events