.NET Developer (UN) at altersolutions | Warsaw

On-site Full-time

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Qualifications

Proficiency in . NET framework and C# programming. Experience with ASP. NET and MVC frameworks. Understanding of RESTful APIs and web services. Familiarity with SQL Server or similar databases. Excellent problem-solving skills and attention to detail. Ability to work effectively in a team-oriented environment.

About the job

Join altersolutions as a . NET Developer and be part of a dynamic team in Warsaw, where you will contribute to exciting projects and develop innovative software solutions. We seek passionate developers who thrive on creativity and collaboration.

About altersolutions

altersolutions is a forward-thinking company specializing in technology solutions that drive business success. We are committed to fostering a culture of innovation and collaboration, helping our clients achieve their goals through expert software development.

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.NET Developer (f/m) - Innovative Tech Solutions

netcompany1

Full-time|On-site|Warsaw

Join our team as a .NET Developer and be part of our dynamic tech environment where innovation and collaboration thrive. In this role, you will develop high-quality software solutions and contribute to exciting projects that impact our clients positively.

Mar 24, 2026

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Fullstack Developer (.NET + Angular) at altersolutions | Warsaw

altersolutions

Full-time|On-site|Warsaw

Dołącz do naszego zespołu jako Fullstack Developer (.NET + Angular) i pracuj z wiodącym klientem w branży ubezpieczeniowej. Będziesz odpowiedzialny za projektowanie oraz rozwijanie nowoczesnych aplikacji, które spełniają potrzeby naszych klientów. Jeśli posiadasz doświadczenie w .NET oraz Angular, ta oferta jest dla Ciebie!

Oct 23, 2025

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Regular .NET Developer for Card Payment Solutions

margo-group

Full-time|Remote|Warsaw

About the RoleJoin our dynamic team at margo-group as a Regular .NET Developer, where you will play a pivotal role in the development and maintenance of our core card payment systems. You will be involved in everything from transaction authorization and settlement to integrations with external payment services, catering to hundreds of thousands of transactions daily. Ensuring optimal performance, availability, and security is our top priority.Work Model: This is a remote-first position, with scheduled on-site team meetings twice a month in Warsaw.Key Responsibilities- Develop and maintain .NET applications within the card payment sector.- Design and implement new functionalities in compliance with business and regulatory requirements.- Integrate systems with external services using REST, SOAP, and messaging queues.- Optimize application performance, availability, and security.- Collaborate with Analysts, Architects, and QA teams in an Agile/Scrum environment.- Participate in SIT/UAT testing, code reviews, and the preparation of technical documentation.Required Skills- Proven commercial experience with C# and .NET (Framework/Core).- Familiarity with ASP.NET Core, Angular, and WebAPI.- Knowledge of Entity Framework, LINQ, and Dapper.- Proficiency with SQL Server (T-SQL) and query optimization techniques.- Understanding of SOLID principles and design patterns.- Experience writing unit tests (xUnit/NUnit).- Knowledge of system integrations (REST, SOAP, JSON, XML).- Experience working in an Agile environment.- Familiarity with Git, CI/CD, and TeamCity.Language Requirements- Polish: Native or C2 level (required).- English: Professional level for technical documentation.Nice to Have- Experience in the card payments/payment processing domain.- Knowledge of Docker and Kubernetes.- Experience with high-availability or complex distributed systems.

Jan 23, 2026

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Fullstack .NET Angular Developer

Altersolutions

Full-time|On-site|Warsaw

Join our dynamic team at Altersolutions as a Fullstack .NET Angular Developer! In this role, you will have the opportunity to work with cutting-edge technologies and contribute to innovative projects that impact our clients positively. Collaborate with cross-functional teams to design, develop, and implement robust applications that meet business requirements.

May 13, 2025

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Fullstack .NET & Angular Developer

MARGO Group

Full-time|On-site|Warsaw

About Us:MARGO Group is a leading international IT consulting firm established in 2005 in Paris, with additional offices in London and Warsaw. We excel in IT outsourcing and the provision of highly skilled professionals for intricate technology projects throughout Europe. Our commitment at MARGO is to foster long-lasting partnerships, uphold transparency, and encourage continuous growth and development.

Jan 22, 2026

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.NET Developer (UN) at altersolutions | Warsaw

altersolutions

Full-time|On-site|Warsaw

Join altersolutions as a .NET Developer and be part of a dynamic team in Warsaw, where you will contribute to exciting projects and develop innovative software solutions. We seek passionate developers who thrive on creativity and collaboration.

May 9, 2025

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Junior .NET Developer at netcompany1 | Warsaw

netcompany1

Full-time|On-site|Warsaw

Join our dynamic team as a Junior .NET Developer at netcompany1 in Warsaw. In this role, you will have the opportunity to develop innovative software solutions using the latest technologies. You will collaborate with experienced developers, gain hands-on experience, and contribute to exciting projects that make a real impact.

Mar 24, 2026

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Senior .NET Developer with Angular Expertise

MARGO Group

Full-time|Hybrid|Warsaw

About Us:MARGO Group is a leading international IT consulting firm established in 2005 in Paris, with additional offices in London and Warsaw. We specialize in IT outsourcing and providing top-tier experts for intricate technology projects across Europe. Our focus is on fostering long-term partnerships, maintaining transparency, and promoting continuous development.About the Role:We are seeking a Senior .NET Developer with Angular expertise to engage in long-term enterprise banking projects within structured development environments. You will be involved in creating complex business applications while collaborating closely with Analysts, QA Engineers, and Product stakeholders.This position is intended for seasoned developers with over 5 years of experience who prioritize clean code, testing, sound architectural practices, and uphold high engineering standards.Work Model: Remote-first with scheduled on-site team meetings (2 days per month in Warsaw). Office attendance is primarily for team alignment, planning sessions, and direct collaboration.

Jan 23, 2026

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Senior Fullstack .NET Developer with Angular Expertise

MARGO Group

Full-time|On-site|Warsaw

Join MARGO as a Senior Fullstack .NET Developer!Are you passionate about technology and looking to make an impact in the field of IT consulting? MARGO, an international leader in IT consulting, is seeking a Senior Fullstack .NET Developer with Angular expertise to join our dynamic team in Warsaw. Established in 2005 in Paris, with additional offices in London and Warsaw, we pride ourselves on providing top-tier IT experts for complex enterprise projects across Europe. At MARGO, we are committed to building long-lasting partnerships, ensuring transparency in our processes, and maintaining technical excellence in everything we do.

Jan 22, 2026

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Skilled IT Developers (f/m)

netcompany1

Full-time|On-site|Warsaw

Join our dynamic team at netcompany1 as a talented IT Developer. We are looking for innovative and skilled professionals who are passionate about technology and ready to tackle exciting challenges in a collaborative environment. As part of our team, you will contribute to the development of cutting-edge software solutions that empower our clients to achieve their business goals.

Mar 24, 2026

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Fullstack Developer (.NET & Angular) with Cloud-Native Expertise

margo-group

Full-time|On-site|Warsaw

Join margo-group as a Fullstack Developer specializing in .NET and Angular, focusing on cloud-native applications. In this role, you will collaborate with cross-functional teams to design, develop, and deploy robust applications that leverage the power of cloud technology. If you are passionate about innovative software solutions and enjoy working in a dynamic environment, we want to hear from you!

Mar 30, 2026

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Junior .NET Developer at Netcompany Banking Services | Warsaw

Netcompany

Full-time|On-site|Warsaw

Join our dynamic team at Netcompany as a Junior .NET Developer, where you'll be part of a vibrant working environment focused on innovation and collaboration. In this role, you'll contribute to the development of cutting-edge banking solutions, enhancing user experiences through efficient and scalable applications.

Mar 24, 2026

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Fullstack Developer (.Net) - Log Tooling

Veepee

Permanent|On-site|Warsaw

As a trailblazer in online flash sales since 2001, Veepee stands as a cornerstone in the European e-commerce landscape, partnering with over 7,000 brands to deliver exceptional deals on a wide array of products for a limited time. With a remarkable turnover of 3.3 billion euros incl. VAT in 2024, Veepee boasts a dynamic workforce of 5,000 employees across 10 countries, operating in sectors such as fashion, home, wine, travel, and beauty. JOB DESCRIPTIONWe are excited to invite an experienced Backend/Full Stack Developer to join our innovative Logistics Tooling team at VeepeeTech. This pivotal role involves developing cutting-edge solutions that enhance warehouse operations and optimize the Veepee return process, ensuring an efficient and seamless experience for our customers.

Aug 13, 2025

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Product Designer in the .NET Ecosystem

JetBrains s.r.o.

Full-time|Remote|Belgrade, Serbia; Berlin, Germany; Limassol, Cyprus; Madrid, Spain; Munich, Germany; Prague, Czech Republic; Remote, Germany; Warsaw, Poland; Yerevan, Armenia

JetBrains is hiring a Product Designer to focus on the .NET ecosystem. This position involves designing developer tools that improve workflow and make daily tasks more enjoyable. The role is open to candidates in Belgrade, Berlin, Limassol, Madrid, Munich, Prague, Warsaw, Yerevan, or remote within Germany. What you will do Collaborate with engineers, product managers, and fellow designers to build user-centered solutions for .NET products. Shape the visual and interactive aspects of developer tools, ensuring usability aligns with technical needs. Turn research findings and user feedback into clear, effective design concepts. About JetBrains JetBrains creates intelligent software tools used by millions of developers worldwide. The team emphasizes thoughtful design and practical problem-solving to support the work of software professionals.

Apr 27, 2026

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Java Developer at Alter Solutions | Warsaw

Alter Solutions

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Java Developer at Alter Solutions | Warsaw

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Join our dynamic team at Alter Solutions as a Java Developer! We are seeking a talented individual who is passionate about coding and eager to contribute to innovative projects. As a Java Developer, you will play a crucial role in developing high-quality software solutions, collaborating with cross-functional teams, and ensuring the best practices in software development are followed.

Jun 5, 2025

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Senior TypeScript/Node.js Developer for Innovative Swedish Ad Platform

Sigma Software Group

Full-time|On-site|Warsaw

Join our dynamic team as a Senior TypeScript/Node.js Developer and contribute to a cutting-edge advertising platform designed for the Swedish market. In this role, you will leverage your extensive experience in TypeScript and Node.js to develop robust and scalable applications that enhance user engagement and drive business growth.As part of our innovative company, you’ll collaborate with cross-functional teams to deliver high-quality software solutions while utilizing the latest technologies in a supportive and creative environment.

Mar 26, 2026

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Tech Lead/Senior Embedded Linux Software Engineer | Networking Solutions

Teltonika Networks

Full-time|On-site|Warsaw, Masovian Voivodeship, Poland

Teltonika Networks seeks a Tech Lead or Senior Embedded Linux Software Engineer for its Warsaw office. This position centers on developing and enhancing networking solutions that enable industrial connectivity in fields such as Industry 4.0, Smart Cities, and Green Energy. Role overview This role involves building software for both bare metal and embedded Linux devices. The work addresses complex challenges at the intersection of software and hardware, supporting industrial-grade connectivity equipment like routers, switches, gateways, and modems. These products help power modern infrastructure and automation. What you will do Develop software for bare metal and embedded Linux platforms Tackle challenging problems that involve both software and hardware Research and implement new technologies to keep solutions up to date Integrate with hardware components and embedded systems Coordinate with team members in Warsaw and the headquarters in Lithuania Offer technical guidance and mentorship to colleagues About the products The Networking Solutions division designs and manufactures equipment for industrial connectivity. To see the full product range, visit https://www.teltonika-networks.com/products.

Apr 27, 2026

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Senior Java Fullstack Developer at Alter Solutions | Warsaw

Alter Solutions

Full-time|On-site|Warsaw

Join our dynamic team at Alter Solutions as a Senior Java Fullstack Developer, where you will leverage your expertise in Java and full-stack development to create innovative solutions. You will work collaboratively within a talented team, contributing to both frontend and backend development, and enhancing our software architecture.

May 23, 2025

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Tech Lead (PHP, React, Cursor/Windsurf) - Join Our Innovative Team!

Telemedi

Full-time|On-site|Warsaw, Masovian Voivodeship, Poland

Are you ready to lead and innovate in a rapidly evolving tech landscape? Join Telemedi as a Tech Lead!We are seeking a Tech Lead for our IT team to drive our ambitious growth while embracing AI in software development. As a Senior Developer, you will adeptly navigate an AI-integrated IDE, ensuring rapid delivery of business value through IT solutions without compromising on code quality.The old ways of IT are behind us; a new era of software development is here. At Telemedi, we are at the forefront of transforming the development process. By combining cutting-edge technologies with technical expertise and exceptional commitment, we can build more, faster, and better than ever before.Our developers work with Cursor AI (cursor.com), an IDE that revolutionizes programming paradigms. We can accomplish in hours what takes other developers days, and we expect the same from you.Apply if you:Desire to work in a product company with a fascinating and complex business domain where your contributions today yield measurable results tomorrow.Thrive on challenges and enjoy working with intricate applications.Flourish in a dynamic environment full of activity.Take initiative and continuously strive to elevate team standards.Feel a sense of responsibility for your work and your team.Welcomingly accept constructive feedback to enhance your performance.Enjoy understanding business needs and communicate effectively with others, not just in IT.Can swiftly and efficiently create quality applications/features.Are confident in your technical knowledge and can enhance application quality, including progressively improving legacy code.Proactively improve processes around you.Your Responsibilities:Set the benchmark for the IT team regarding work standards.Ensure high programming quality and fast task delivery both individually and as a team.Select tasks necessary for achieving business objectives (avoiding tasks that are not immediately beneficial).Participate in the end-to-end creation of IT solutions alongside business departments (here, IT is not a “silo”).Develop web applications (new features, bug fixing, refactoring) - engage in active programming.Contribute to designing the architecture of new solutions and development infrastructure.Participate in code reviews and maintain the quality of created solutions.Continuously enhance development process standards.Collaborate closely with the team (Developers, PMs/POs, QAs).

Jan 8, 2026

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