Senior .NET Developer (Banking) – Remote (Poland)

🏢 Summary: Senior .NET Developer role focused on designing, extending, and modernising critical banking and securities systems in a fully remote B2B model. The position involves full-stack development, system integration, and cloud scaling within distributed, business-critical environments. The role requires close collaboration with business stakeholders and ownership of end-to-end application delivery. 🗂️ Requirements: 5+ years experience as .NET / C# Developer, Experience in banking or investment banking sector, Full-stack development experience, Knowledge of SOLID design principles, Experience with document-based databases, Experience with event-driven messaging frameworks, Experience with unit and integration testing, End-to-end application development experience, Ability to work during UK business hours, Based in Poland 📃 Skills: .NET, C#, MongoDB, SOLID, Messaging, UnitTesting, IntegrationTesting, Docker, Kubernetes, Cloud 🏢 Description: Work model: 100% remote (candidates must be based in Poland) Contract type: B2B Industry: Banking / Investment Banking We are looking for an experienced Senior .NET Developer to join a distributed engineering team working on critical banking systems. The role focuses on extending and modernising applications used across securities and banking operations, with a strong emphasis on system design, scalability, and cloud transformation. You will work end-to-end on business-critical systems, closely collaborating with Business Analysts, without a separate QA team. A solid background in banking or financial services is essential. Main Responsibilities: Design, develop, and extend .NET-based systems supporting multiple banking entities Contribute to the integration of securities and core banking platforms Support and enhance a portfolio of ~17 applications across product control and risk management Work with an in-house development framework in a full-stack capacity Participate in scaling applications for cloud-based, containerized environments Collaborate closely with business stakeholders to deliver robust solutions Ensure high code quality through unit and integration testing Key Requirements: 5+ years of professional experience as a .NET / C# Developer Hands-on experience in the banking or investment banking sector (mandatory) Full-stack development experience (backend-focused, frontend included) Strong understanding and practical application of SOLID design principles Experience with document-based databases (e.g. MongoDB) Experience with event-driven / event-based messaging frameworks Solid knowledge of unit and integration testing Experience working end-to-end on applications (development, testing, support) Ability to work independently in a fast-paced, regulated environment Availability during UK business hours Nice to Have: Experience with cloud platforms and application migration to cloud Experience with container technologies (e.g. Docker, Kubernetes) Exposure to systems such as Murex or large in-house banking platforms Background in securities, risk, or product control systems Other Details: This role is 100% remote with candidates required to be located in Poland. The contract is on a B2B basis within the banking and investment banking industry.

🏢 Summary: Senior .NET Developer role focused on building and maintaining secure, high-performance online banking solutions in a hybrid work model. The position involves developing new backend features, optimizing databases, and managing containerized applications in an Agile, distributed environment. The role also includes ensuring code quality, supporting production systems, and contributing to secure payment functionalities. 🗂️ Requirements: Minimum 4 years of experience in IT systems development, Strong hands-on experience with .NET, Strong knowledge of PostgreSQL, Strong knowledge of MS SQL, Experience with Docker, Experience with Kubernetes, Practical understanding of Agile methodology, Ability to develop new features and maintain existing systems, Ability to work independently in distributed teams 📃 Skills: .NET, C#, PostgreSQL, MS SQL, SQL, Docker, Kubernetes, Agile, Elixir, Sorbnet 🏢 Description: Innovate online banking and join the team as a Senior .NET Developer! Warsaw-based opportunity with hybrid work model (2 times in the office/month). As a Senior .NET Developer , you will be working for our client, one of the leaders in online banking, supporting the development and maintenance of secure, high-performance financial solutions. You’ll be contributing to a team responsible for building and enhancing banking functionalities, ensuring reliability and innovation. Working in a distributed Agile environment, you’ll play a key role in both implementing complex backend logic and actively collaborating with cross-functional teams. Your main responsibilities: Design and develop new features in .NET 8 Implement and optimize SQL-based data access Build and maintain containerized applications using Docker and Kubernetes Collaborate with distributed teams in an Agile environment Participate in the development of secure payment solutions Share knowledge and support less experienced team members Ensure code quality through code reviews and testing Maintain existing functionalities and resolve production issues Manage your own time and responsibilities while working remotely You're ideal for this role if you have: Strong experience in developing IT systems (min. 4 years of experience) Solid hands-on experience with .NET Strong knowledge of PostgreSQL and MS SQL Practical understanding of Agile software development Excellent communication and collaboration skills in distributed teams Ability to work independently and manage your time effectively Experience in developing new features and maintaining existing ones A passion for software development and continuous learning Experience with Docker and Kubernetes Nice to have: Knowledge of banking domain such as payments and transactions (e.g. Elixir, Sorbnet)

🏢 Summary: Senior .NET Developer role focused on building and maintaining secure, high-performance online banking solutions in a distributed Agile environment. The position involves developing backend features in .NET 8, optimizing SQL-based data access, and working with containerized applications. Hybrid work model with strong emphasis on reliability, security, and collaboration. 🗂️ Requirements: Minimum 4 years of experience in IT system development, Hands-on experience with .NET, especially .NET 8, Strong knowledge of PostgreSQL, Strong knowledge of MS SQL, Experience with Docker, Experience with Kubernetes, Practical experience in Agile software development, Experience in developing new features and maintaining existing systems, Good command of Polish, Legal right to work in the European Union 📃 Skills: .NET, C#, PostgreSQL, MSSQL, SQL, Docker, Kubernetes, Agile 🏢 Description: Ignite digital innovation — shape the future of online banking! Warszawa-based opportunity with hybrid work model (2 days in the office/month, up to 4 remote days/week). As a Senior .NET Developer , you will be working for our client, a leader in online banking, supporting the development and maintenance of secure, high-performance financial solutions. You’ll join a dynamic team dedicated to building cutting-edge banking functionalities, ensuring top-tier reliability and innovation. Operating within a distributed Agile environment, you’ll play a pivotal role in implementing complex backend logic while collaborating seamlessly across teams. This is your chance to contribute to transformative financial technology and accelerate your career growth. Your main responsibilities: Design and develop new features in .NET 8 to enhance banking solutions. Implement and optimize SQL-based data access for performance and security. Build and maintain containerized applications using Docker and Kubernetes. Collaborate with distributed teams within an Agile framework. Participate in the development of secure payment solutions. Share knowledge and mentor less experienced team members. Ensure code quality through reviews and testing. Maintain existing functionalities and address production issues. Manage your time effectively while working remotely. You're ideal for this role if you have: At least 4 years of experience in IT system development. Solid hands-on experience with .NET (especially .NET 8). Strong knowledge of PostgreSQL and MS SQL. Practical understanding of Agile software development. Excellent communication and collaboration skills in distributed teams. Ability to work independently and manage your responsibilities. Experience developing new features and maintaining existing ones. Passion for software development and continuous learning. Experience with Docker and Kubernetes. It is a strong plus if you have: (optional) Certifications in relevant technologies. Experience with financial or payment systems. Language Required for the role: Good command of Polish. Eligibility to work on this role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Senior .NET Developer role focused on building and enhancing distributed microservices for digital banking systems in a European financial environment. The position involves designing scalable, high-quality solutions using C# and .NET, implementing asynchronous communication, and ensuring robust automated testing practices. Remote-first model with collaboration on complex financial platforms. 🗂️ Requirements: 5+ years of experience in C# and .NET development, Strong experience with microservices architecture, Knowledge of CQRS, REST, OOP, EventSourcing, Experience with RabbitMQ or Kafka, Experience with NoSQL and relational databases, Experience with automated testing (unit, integration, contract), Knowledge of DomainDrivenDesign principles, Understanding of BPMS workflows, Experience with Git, Good command of Polish, Legal right to work in the EU 📃 Skills: C#, .NET, Microservices, CQRS, REST, OOP, EventSourcing, RabbitMQ, Kafka, Git, NoSQL, SQL, Docker, Testcontainers, Pact, DomainDrivenDesign, BPMS 🏢 Description: Unleash innovation — revolutionize financial systems with expert .NET development! Wroclaw-based opportunity with remote work model (5 remote days per week). As a Senior .NET Developer , you will be working for our client, a leading financial organization committed to transforming the digital banking experience. You’ll contribute to building and enhancing distributed microservices that enable seamless financial operations across Europe, driving innovation and operational excellence. Your main responsibilities: Develop and maintain scalable, high-quality microservices using C# and .NET technologies following Domain-Driven Design principles. Design and implement asynchronous communication patterns with RabbitMQ or Kafka to ensure system robustness. Collaborate with cross-functional teams to create automated tests, including unit, integration, and contract tests, utilizing Docker, Testcontainers, and Pact. Optimize code for performance, scalability, and reliability, adhering to Clean Code standards. Implement RESTful APIs and work with NoSQL and relational databases for effective data management. Contribute to the continuous improvement of development processes and best practices. Engage proactively in team collaboration, sharing knowledge and solving complex technical challenges. You're ideal for this role if you have: Minimum of 5 years of experience in C# and .NET development in a senior role. Understanding of workflows in BPMS platforms. Strong knowledge of microservices architecture, CQRS, REST, OOP, and Event Sourcing. Practical experience with asynchronous messaging (RabbitMQ/Kafka), Git, NoSQL databases, and relational databases. Familiarity with automated testing frameworks, including unit, integration, and contract testing. Good understanding of Domain-Driven Design (DDD) principles and clean code practices. Excellent team collaboration skills and a responsible, engaged work attitude. It is a strong plus if you have: Experience with Polish language communication skills. Knowledge of automated testing tools and frameworks. Language Required for the role: Polish: Good command Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Remote Senior .NET Developer role in the banking sector focused on developing and scaling banking systems, integrating securities and banking operations, and supporting cloud-based applications. The position requires strong full-stack .NET and Angular expertise, experience with testing and event-driven systems, and familiarity with banking environments. The recruitment process includes a skills assessment and technical interview. 🗂️ Requirements: 5+ years of .NET development experience, Angular proficiency, Full-stack development experience, Hands-on code testing experience, Knowledge of SOLID principles, Experience with document-based databases, MongoDB experience, Unit testing experience, Integration testing experience, Experience with event-based messaging frameworks, Banking industry experience 📃 Skills: .NET, Angular, MongoDB, SOLID, Testing, Messaging, Cloud, Containers 🏢 Description: Work model: This is a remote opportunity within the banking sector, Start date: ASAP Rate: up to 180 zl/h under a B2B arrangement. Recruitment process : The recruitment process includes a skills assessment and a technical interview. Introduction & Summary: We are seeking a highly skilled Senior .NET Developer with a strong background in developing and extending systems for the banking industry. The ideal candidate will possess at least 7 years of experience in .NET development along with proficiency in front-end technologies, particularly Angular. This is a 100% remote position requiring a proactive approach towards scaling applications and supporting cloud-based solutions. Main Responsibilities: Develop and extend systems to support additional entities. Merge securities and banking operations seamlessly. Provide support for 17 applications including product control and risk management. Utilize in-house development frameworks. Scale systems for cloud-based operations to onboard new entities. Key Requirements: 5+ years of experience in .NET development. Proficiency in front-end technologies, specifically Angular. Full-stack development experience with hands-on code testing. Solid understanding of SOLID design principles. Experience with document-based databases. Familiarity with MongoDB. Integrated experience with unit and integration testing. Experience with event-based messaging frameworks. Background in the banking industry. Nice to Have: Advanced cloud computing skills. Experience with containerized solutions.

🏢 Summary: Remote Senior .NET Developer role (EST hours) focused on designing and enhancing backend services for a banking trading platform, with strong emphasis on .NET and Oracle PL/SQL development in an Agile environment. The position involves building scalable integrations and maintaining critical trading functionalities. It targets experienced backend engineers within financial services. 🗂️ Requirements: 6+ years backend development experience, Strong experience with .NET Framework, Strong experience with C#, Solid expertise in Oracle PL/SQL, Experience with REST APIs, Experience with distributed application architectures, Experience in enterprise or financial services environments, Ability to work in Agile teams, Poland based candidate, Availability to work EST hours 📃 Skills: .NET, C#, Oracle, PLSQL, REST, SQL, CI/CD, Git, Agile 🏢 Description: *We are looking for Poland based candidate. The job is remote with EST working hours. At Capco Poland, we’re not just another consultancy - we’re the spark behind digital transformation in the financial world. As a global leader in technology and management consulting, we thrive on helping clients tackle the toughest challenges across banking, payments, capital markets, wealth, and asset management. Build scalable backend solutions powering the next generation of digital trading experiences. The Role We are looking for a Senior .NET Developer to join a high-performing delivery team supporting the enhancement and expansion of a leading banking client’s trading application platform. You will play a key role in designing, developing, and maintaining backend services and integrations that support critical trading functionality and business operations. This role is ideal for someone with strong backend engineering expertise, solid database development experience, and a collaborative mindset who enjoys working in fast-paced Agile delivery environments. What You’ll Do Design, develop, and maintain backend services and APIs using .NET Framework technologies Develop and optimize Oracle PL/SQL packages, procedures, functions, and database objects Collaborate with cross-functional teams including QA, business analysts, and frontend developers to deliver new trading platform features Participate in code reviews, technical design discussions, and release activities to ensure high-quality software delivery Troubleshoot production issues, identify performance improvements, and support ongoing platform stability What We’re Looking For 6+ years of backend development experience within enterprise or financial services environments Strong hands-on experience with .NET Framework and C# application development Solid expertise in Oracle PL/SQL development and database optimization Experience working with REST APIs, integrations, and distributed application architectures Strong problem-solving, communication, and stakeholder collaboration skills within Agile teams Bonus Points For Experience working on trading platforms, banking systems, or capital markets applications Familiarity with performance tuning and query optimization in Oracle databases Exposure to CI/CD pipelines, source control tools, and automated deployment processes Understanding of secure coding standards and enterprise application best practices We offer a flexible collaboration model based on a B2B contract, with the opportunity to work on diverse projects. Recruitment Process: HR Interview with the recruiter Technical Interview Client Interview Feedback and offer

🏢 Summary: Long-term project for a Senior/Expert .NET Developer focused on backend and API development within enterprise banking systems. The role involves developing and optimizing software solutions, working with legacy code, and providing technical leadership and mentorship. The position emphasizes high-quality standards, collaboration, and code excellence in a complex financial environment. 🗂️ Requirements: Strong knowledge of C#, Strong knowledge of .NET framework, Expertise in ASP.NET Core, Experience in API development, Experience with SQL Server design and development, Ability to analyze and troubleshoot legacy code, Solid understanding of OOP principles, Knowledge of software engineering best practices 📃 Skills: C#, .NET, ASP.NET, SQL, T-SQL, Git, Jenkins, Angular, HTML, CSS, JavaScript, Visual Studio, Postman, Swagger, Bitbucket, Bootstrap, SQL Server 🏢 Description: We’re looking for an Expert/Senior .NET Developer to join a long-term project for a leading client in the banking industry. Project Type: Enterprise banking systems – backend & API development, code optimization, and mentorship Responsibilities: Design, develop, and maintain software solutions Analyze, refactor, and troubleshoot legacy code Conduct code reviews and uphold high-quality standards Collaborate with QA and Business Analysts Mentor junior developers and provide technical leadership Must-Have Experience: Strong knowledge of C# and the .NET framework Expertise in ASP.NET Core and API development Experience with SQL Server (design & development) Ability to work with and troubleshoot legacy code Solid understanding of OOP and software engineering best practices Nice-to-Have: Familiarity with Git, Jenkins, and testing frameworks Understanding of cloud concepts & web security best practices Knowledge of frontend technologies (Angular, HTML, CSS, JavaScript) Tools & Tech Stack:Visual Studio, Postman, Swagger, Bitbucket, SQL Server Management Studio, T-SQL, Bootstrap (or similar)

🏢 Summary: The role involves developing and maintaining a large-scale open banking platform focused on secure, high-performance API integrations with European financial institutions. The position centers on backend development in .NET and Java within cloud-based, distributed systems. You will design and optimize secure connectivity solutions aligned with PSD2 standards in an international, collaborative environment. 🗂️ Requirements: Strong experience building backend services using Java and .NET, Approximately 6 years of experience in C# programming, Solid knowledge of Java programming, Strong understanding of API design, Understanding of distributed systems, Experience working in cloud environments, Experience integrating with banks via PSD2 interfaces, Ability to write clean, maintainable, testable code 📃 Skills: C#, Java, .NET, APIs, PSD2, Cloud, DistributedSystems 🏢 Description: Join an international technology team building next-generation open banking solutions used across Europe. Our platform enables secure, reliable, and high-quality connectivity to financial institutions—powering innovative products and services in the digital payments ecosystem. You will work in a highly skilled, collaborative environment alongside teammates located mainly in Denmark, Ireland, and Romania. As a .NET Developer, you will contribute to the development, improvement, and maintenance of a large-scale open banking platform. You will work on advanced API solutions focused on security, data processing, monitoring, onboarding automation, and high-performance connectivity. This role is ideal for engineers who enjoy solving complex problems, working in modern cloud environments, and collaborating with international teams. Our expectations: Strong experience in building backend services (Java + .Net). Approximately 6 years of relevant experience in C# programming. Solid knowledge in Java programming. Solid understanding of API design, distributed systems, cloud environments. Experience in establishing bank connections through PSD2 interfaces. Ability to write clean, maintainable, and testable code. Experience working in fast-paced, product-centric environments. Collaborative mindset and eagerness to work closely with product and engineering peers. Proficiency in English, fluent Polish. Hybrid work 2-3 days per week (Gdansk). Proficiency in English, fluent Polish, Hybrid work 2-3 days per week (Warsaw or Gdansk). Main responsibilities: Design, develop, and maintain APIs and integration modules connecting the platform to thousands of European banks and financial institutions. Collaborate with engineers and product stakeholders to define requirements, set acceptance criteria, and deliver solutions. Contribute to architecture by ensuring scalability, maintainability, and adherence to best practices. Maintain quality through code reviews, testing, and continuous improvement initiatives. Solve complex problems involving performance, distributed systems, and regulatory constraints.

🏢 Summary: Mid-Level .NET Developer role focused on building and enhancing large-scale core banking systems in a hybrid work model. The position involves developing new functionalities, improving existing applications, and ensuring high quality through automated testing within a digital banking environment. 🗂️ Requirements: Minimum 3 years of software development experience, Experience in financial technology sector, Proficiency in C#, Proficiency in .NET and .NET Core, Experience with MS SQL, Experience with PostgreSQL, Understanding of object-oriented programming, Knowledge of design patterns, Experience with Docker, Experience with Kubernetes, Knowledge of automated testing, Familiarity with SOLID principles, Communicative Polish proficiency, Legal right to work in the European Union 📃 Skills: C#, .NET, .NETCore, MSSQL, PostgreSQL, OOP, SOLID, Docker, Kubernetes, Agile 🏢 Description: Ignite the future of digital banking — develop innovative solutions that transform financial services! Warszawa-based opportunity with hybrid work model (2 days in the office / 4 days remote per week). As a Mid-Level .NET Developer , you will be working for our client, a leading player in the online banking sector dedicated to developing and maintaining large-scale financial systems that support daily digital banking operations. Join a forward-thinking team building solutions that shape the future of financial services, offering exciting opportunities for growth and innovation. Your main responsibilities: Implement new functionalities and system improvements in applications developed in the .NET environment. Participate in development work within projects related to the core banking system. Develop and maintain automated tests to ensure high-quality solutions. Collaborate with analysts and business users to support requirements analysis and clarification. Participate in internal software testing and verification processes. Create and update technical and functional documentation for developed solutions. Support the development team in maintaining system stability and performance. You're ideal for this role if you have: At least 3 years of experience in software development, preferably within the financial technology sector. Good knowledge of C#, .NET, .NET Core. Experience with MS SQL and PostgreSQL. Understanding of object-oriented programming principles and design patterns. Hands-on experience with Docker and Kubernetes. Knowledge of automated testing techniques. Ability to work effectively in a team environment. Strong communication skills and attention to detail. Good organizational skills and the ability to quickly learn new technologies. Proficiency in working with technical documentation in English. Familiarity with software development best practices (e.g., SOLID). It is a strong plus if you have: Knowledge of Agile methodologies. Language Required for the role: Communicative Polish proficiency. Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Long-term hybrid .NET Developer role for an international Swiss investment bank focused on building and improving digital products and technology services using modern cloud, microservices, and frontend technologies. The position involves full software development lifecycle responsibilities, production support, and collaboration within agile engineering teams. 🗂️ Requirements: Bachelor’s or Master’s degree in Computer Science, Computer Engineering, or related discipline, Strong experience with C# and .NET Core, Experience building frameworks and APIs with .NET 6 or later, Understanding of object-oriented design, Design Patterns, and SOLID principles, Understanding of multi-threading, Experience with Microsoft Azure services, Experience with cloud architecture and engineering, Experience with microservice and event-driven architectures, Experience with messaging platforms, Experience with containers and Kubernetes, Experience with React, Experience with TypeScript or JavaScript, Experience with CSS3 and HTML5, Agile mindset, Experience with Test Driven Development, Knowledge of DevOps practices, Focus on Clean Code and engineering best practices 📃 Skills: C#, .NET, .NETCore, .NET6, Azure, AKS, Containers, WebApps, AzureFunctions, ServiceBus, StorageAccounts, KeyVault, Microservices, EventDriven, Kafka, Kubernetes, React, TypeScript, JavaScript, CSS3, HTML5, TDD, DevOps, SOLID, Multithreading 🏢 Description: We are currently looking for talented and experienced .NET Developer to join a long-term project with a major international Swiss investment bank operating in the financial sector. 📍 Location: Wroclaw or Krakow 🏢 Hybrid model: 3 days per week from the office Responsibilities Design, develop, and improve digital products and technology services for clients and employees Apply a broad range of software engineering practices, from analyzing user needs to automated testing and deployment Ensure quality, security, reliability, and compliance of solutions Build observability into solutions, monitor production health, resolve incidents, and remediate root causes Understand and advocate for client needs Share knowledge with colleagues, support hiring, and contribute to engineering culture and internal communities Education Bachelor’s and/or Master’s degree in Computer Science, Computer Engineering, or related technical discipline Backend / .NET Strong experience with C# and .NET Core Experience developing frameworks and APIs using .NET 6 or later Understanding of object-oriented design, Design Patterns, and SOLID principles Understanding of multi-threading Cloud & Infrastructure Experience with Microsoft Azure services: AKS Containers Web Apps Azure Functions Service Bus Storage Accounts Key Vault Experience with Cloud architecture and engineering, ideally Azure Architecture Experience with: Microservice architecture Event-Driven architecture Service/Micro-Service architectures Loosely coupled systems Reusable components Messaging & Containers Experience with messaging platforms, ideally Kafka Experience with Containers, ideally Kubernetes Frontend Experience with React Experience with TypeScript / JavaScript Experience with CSS3 and HTML5 Engineering Practices Agile mindset Test Driven Development (TDD) DevOps practices Focus on Clean Code and engineering best practices Benefits ✅ Stable long-term cooperation with opportunity for extension Opportunity to work with modern technologies in an international environment Professional growth and continuous development opportunities Participation in challenging and impactful projects 📩 If you’re interested and meet the qualifications, please send your CV at alina.pchelnikova@dcvtechnologies.co.uk