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: Remote Senior .NET Developer role focused on extending and scaling banking systems, integrating securities and banking operations, and supporting product control and risk management applications. The position requires full-stack .NET and Angular development, testing expertise, and experience with cloud-oriented system scaling. 🗂️ Requirements: 5+ years of .NET development experience, Angular proficiency, Full-stack development experience, Hands-on code testing experience, SOLID design principles, Document-based database experience, MongoDB familiarity, Unit and integration testing experience, Event-based messaging framework experience, Banking industry experience 📃 Skills: .NET, Angular, SOLID, MongoDB, Testing, Messaging, Banking 🏢 Description: 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: 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: Hybrid .NET Developer role supporting the development and improvement of a large-scale core banking platform. The position focuses on delivering new features, improving performance and reliability, building automated tests, and collaborating with analysts and business stakeholders. 🗂️ Requirements: C# and .NET/.NET Core knowledge, MS SQL and PostgreSQL experience, Object-oriented programming and design-patterns knowledge, Docker and Kubernetes experience, Automated-testing knowledge, Teamwork and communication skills, Ability to work with technical documentation in English, Knowledge of software-development best practices, including SOLID 📃 Skills: C#, .NET, .NETCore, MSSQL, PostgreSQL, Docker, Kubernetes, OOP, SOLID 🏢 Description: Ignite the future of digital banking — develop innovative solutions that transform financial services! Warsaw-based opportunity with hybrid work model (2 days in the office/month). As a .NET Developer you will be working for our client, one of the leaders in the online banking sector that develops and maintains large-scale financial systems supporting daily operations of digital banking services. In this role you will contribute to the development and improvement of a core banking platform used across the organization. You will work closely with analysts, developers, and business stakeholders to implement new functionalities, improve system performance, and ensure the reliability and quality of software solutions in a modern .NET environment. 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 of delivered 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: Good knowledge of C#, .NET, .NET Core Experience with MS SQL and PosgreSQL 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 ability to quickly learn new technologies Ability to work with technical documentation in English Familiarity with software development best practices (e.g. SOLID) Nice to have: Knowledge of Agile methodology

🏢 Summary: Hybrid .NET Developer role supporting a digital banking modernization program, rebuilding legacy BPM applications into scalable modern .NET solutions. The position combines backend development, automated testing, enterprise integrations, Kubernetes deployment support, and AI-assisted development with Claude and Codex. 🗂️ Requirements: 3+ years of C# and .NET development experience, Experience with .NET Framework and legacy-code modernization, Practical experience with Claude and Codex, Strong automated-testing experience, Enterprise application design and implementation experience, Strong MS SQL knowledge, Experience with Git, JIRA and TeamCity, English proficiency for technical documentation 📃 Skills: C#, .NET, .NETFramework, Claude, Codex, MS SQL, Git, JIRA, TeamCity, LLM, Testing 🏢 Description: Unleash innovative web solutions — shape the future of digital banking experiences! Łódź-based opportunity with hybrid work model (2 days in the office/month). As a .NET Developer you will be working for our client, a leading financial institution focused on delivering innovative digital banking solutions. You will join a strategic modernization initiative involving the redevelopment of a BPM platform. The project focuses on rebuilding legacy applications from .NET Framework to modern .NET technologies. You will collaborate closely with AI-powered development tools and help deliver scalable, secure, and maintainable solutions in a complex enterprise environment. Your main responsibilities: Develop and maintain backend services using .NET and C# Rebuild legacy applications from .NET Framework to modern .NET architecture Create and maintain automated tests Collaborate with business stakeholders to analyze and refine requirements Design scalable and maintainable software solutions Integrate applications with databases and external services Utilize LLM-based tools such as Claude and Codex to support software development activities Participate in code reviews and ensure adherence to development standards Deploy and support applications running in Kubernetes environments Work closely with cross-functional teams in an Agile delivery model You're ideal for this role if you have: At least 3 years of experience in software development using C# and .NET Experience with .NET Framework and modernizing legacy code Practical experience working with LLM tools such as Claude and Codex Strong experience with automated testing Experience designing and implementing enterprise applications Strong knowledge of MS SQL Experience using Git, JIRA, and TeamCity Ability to work independently while collaborating effectively within a team English skills sufficient to write and understand technical documentation Nice to have: Knowledge of Docker and Kubernetes

🏢 Summary: Senior Fullstack .NET Developer role for a long-term, fully remote banking programme modernising and scaling cloud-based banking and securities platforms. The role focuses primarily on C#/.NET development, Azure migration, event-driven solutions and Angular front ends, with end-to-end delivery responsibility and occasional on-call support. Offers up to 180 PLN/h + VAT on B2B, UK working hours, and significant technical impact across an international organisation. 🗂️ Requirements: 7+ years of professional .NET development experience, Strong hands-on C# and modern .NET experience, Full-stack development experience, Commercial Angular or modern frontend framework experience, SOLID principles and software design expertise, Unit and integration testing experience, MongoDB or document-oriented database experience, Event-based messaging framework familiarity, Independent full development lifecycle delivery, Availability for occasional on-call shifts, Strong communication skills, Proactive, responsible approach 📃 Skills: C#, .NET, Angular, MongoDB, Azure, Murex, SOLID, Messaging, Queueing, Containers, Testing 🏢 Description: Rate : up to 180 PLN/h + VAT under a B2B contract 100% remote work Long-term cooperation within the banking sector UK working hours Significant technical impact across a large international organisation Opportunity to work with modern cloud, messaging and database technologies Start date: ASAP / flexible We are looking for an experienced Senior Fullstack .NET Developer to join an international banking programme focused on scaling cloud-based platforms and building a unified architecture for banking and securities operations. About the project The programme is focused on combining banking and securities operations within a common technology landscape. The UK architecture has been selected as the target model and is now being extended to support the wider organisation. The team is migrating applications to Azure, introducing containerised solutions and gradually moving away from traditional SQL-based systems towards MongoDB and document-oriented databases. You will work across a portfolio of approximately 17 internally developed applications supporting areas such as Product Control and Risk Management. Your responsibilities Developing and extending applications using C# and .NET (80% of workload) Building scalable systems capable of supporting additional business entities. Contributing to the migration of applications and business logic to Azure. Developing event-driven and message-based solutions. Working with Angular-based frontend applications. Designing solutions in line with SOLID principles and clean-code practices. Writing and maintaining unit and integration tests. Taking end-to-end responsibility for development, testing and implementation. Cooperating closely with Business Analysts and other project stakeholders. Supporting production applications and participating in occasional on-call shifts. Technology environment C# / .NET Angular MongoDB Event-driven architecture Messaging and queueing frameworks Azure Containerised applications Murex and internally developed platforms Unit and integration testing What we are looking for At least 7 years of professional .NET development experience. Strong hands-on experience with C# and modern .NET. Full-stack development experience. Commercial experience with Angular or another modern frontend framework. Very good understanding of SOLID principles and software design. Experience with unit and integration testing. Experience with MongoDB or other document-oriented databases. Familiarity with event-based messaging frameworks. Ability to work independently across the full development lifecycle. Strong communication skills and a proactive, responsible approach. On-call responsibility The position includes an occasional on-call element, typically around 1–2 shifts per month . Recruitment process The recruitment process consists of two stages: A technical coding assignment, estimated at approximately 2–4 hours. A technical interview focused on your solution, design decisions, testing approach and understanding of software engineering principles.

🏢 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