Ciklum is looking for a Senior .NET 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 .NET Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. Together, we will work on the project for a fast-growing, profitable, well-funded and dynamic global payments company serving thousands of corporates and millions of end-users in over 200 countries. You will be a part of the Money Movement team. Responsibilities: - Back-end development to meet customer’s business needs and implement components according to modern microservice architecture - Taking part in the decision-making process in application architecture, solution development, architecture and code review - Develop and review feature design documents and provide inputs and updates to solution specifications - Design and implement various types of tests including unit, integration, and functional tests - Proactive contribution to solution development and process improvements - Working in an international distributed team in an Agile environment - Communicate with PMs, engineers, architects, QA, and other stakeholders - Deliver product roadmap and planning activities - Use high coding standards and software best practices to deliver highly testable, automatable, and performant code across the SDLC Requirements: - More than 5 years of experience in software development - Excellent knowledge of clean code practices, OOP, and OOD - Strong knowledge of programming paradigms and principles including OOP, SOLID, DDD, TDD, and BDD - Strong understanding of database theory including RDBMS and NoSQL - Strong knowledge of code testing practices - Strong understanding of algorithms and data structures - Strong understanding of architectural, enterprise, and design patterns - Strong understanding of security patterns, reverse engineering resistance, and common attack types including OWASP - Strong understanding of network interactions including protocols, REST and RPC conventions, authentication and authorization flows, and standards such as OAuth and JWT - Excellent knowledge and hands-on experience in C# and .NET - Hands-on experience with REST API development - Hands-on experience with .NET Framework, .NET Core, and ASP.NET (Core, MVC, WebAPI) - More than 2 years of experience with testing frameworks such as NUnit, xUnit, and MSTest - Experience with ORM tools such as Entity Framework and Dapper - Experience with RDBMS such as SQL Server, MySQL/MariaDB, and PostgreSQL - Strong experience with key-value storages such as Redis - Experience with messaging systems such as RabbitMQ, Azure Service Bus, Apache Kafka, ActiveMQ, AWS SQS, and Google Pub/Sub - Experience with web servers - Experience with version control systems such as GIT - Experience with Continuous Integration tools such as GitLab Pipeline, Jenkins, and Azure DevOps - Experience with builders - Experience with NoSQL databases such as MongoDB, Elasticsearch, and CouchDB - Experience with troubleshooting, profiling, and debugging applications 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. Want to learn more about us? Follow us on Instagram, Facebook, LinkedIn. 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.

Fuse Energy is a forward-thinking renewable energy startup on a mission to deliver a terawatt of renewable energy - fast. We're combining first-principles thinking with cutting-edge technology to build a radically better energy system. We raised $170M from top-tier investors including Multicoin, Balderton, Lakestar, Accel, Creandum, Lowercarbon, Ribbit, Box Group and strategic angels like Nico Rosberg, the Co-Founder of Solana and GPs behind Meta, Revolut, Spotify, Uber and more. We’re creating a fully integrated energy company: from developing solar, wind and hydrogen projects to real-time power trading and distributed energy installations. By selling directly to consumers, we cut out the middleman, lower costs and pass on savings to customers. But we’re not stopping there. We’re also building the Energy Network: a decentralised platform of smart devices that rewards users in Energy Dollars for electrifying their homes, shifting usage to off-peak hours, and helping balance the grid. This network strengthens grid stability - a critical foundation for scaling AI data centers and other energy-intensive industries. Responsibilities In this role you will work closely within product to build the core digital infrastructure for a next-generation energy company. You will use your experience to engineer backend infrastructure that is second-to-none. You'll be working across the back-end: - Constructing a real-time digital twin of our renewable generation and customer demand - Developing messaging interfaces with our third-party providers - Building high-volume pipelines for processing customer energy consumption - Build the backend of a world class energy app For this role, you should be able to think on your feet and adapt to new business needs as well as take ownership of projects and drive change.

Fuse Energy is a forward-thinking renewable energy startup on a mission to deliver a terawatt of renewable energy - fast. We're combining first-principles thinking with cutting-edge technology to build a radically better energy system. We raised $170M from top-tier investors including Multicoin, Balderton, Lakestar, Accel, Creandum, Lowercarbon, Ribbit, Box Group and strategic angels like Nico Rosberg, the Co-Founder of Solana and GPs behind Meta, Revolut, Spotify, Uber and more. We’re creating a fully integrated energy company: from developing solar, wind and hydrogen projects to real-time power trading and distributed energy installations. By selling directly to consumers, we cut out the middleman, lower costs and pass on savings to customers. But we’re not stopping there. We’re also building the Energy Network: a decentralised platform of smart devices that rewards users in Energy Dollars for electrifying their homes, shifting usage to off-peak hours, and helping balance the grid. This network strengthens grid stability - a critical foundation for scaling AI data centers and other energy-intensive industries. Responsibilities In this role you will work closely within product to build the core digital infrastructure for a next-generation energy company. You will use your experience to engineer backend infrastructure that is second-to-none. You'll be working across the back-end: - Constructing a real-time digital twin of our renewable generation and customer demand - Developing messaging interfaces with our third-party providers - Building high-volume pipelines for processing customer energy consumption - Build the backend of a world class energy app For this role, you should be able to think on your feet and adapt to new business needs as well as take ownership of projects and drive change.

Fuse Energy is a forward-thinking renewable energy startup on a mission to deliver a terawatt of renewable energy - fast. We're combining first-principles thinking with cutting-edge technology to build a radically better energy system. We raised $170M from top-tier investors including Multicoin, Balderton, Lakestar, Accel, Creandum, Lowercarbon, Ribbit, Box Group and strategic angels like Nico Rosberg, the Co-Founder of Solana and GPs behind Meta, Revolut, Spotify, Uber and more. We’re creating a fully integrated energy company: from developing solar, wind and hydrogen projects to real-time power trading and distributed energy installations. By selling directly to consumers, we cut out the middleman, lower costs and pass on savings to customers. But we’re not stopping there. We’re also building the Energy Network: a decentralised platform of smart devices that rewards users in Energy Dollars for electrifying their homes, shifting usage to off-peak hours, and helping balance the grid. This network strengthens grid stability - a critical foundation for scaling AI data centers and other energy-intensive industries. Responsibilities In this role you will work closely within product to build the core digital infrastructure for a next-generation energy company. You will use your experience to engineer backend infrastructure that is second-to-none. You'll be working across the back-end: - Constructing a real-time digital twin of our renewable generation and customer demand - Developing messaging interfaces with our third-party providers - Building high-volume pipelines for processing customer energy consumption - Build the backend of a world class energy app For this role, you should be able to think on your feet and adapt to new business needs as well as take ownership of projects and drive change.