Backend Developer (.Net)

🏢 Summary: B2B opportunity for an experienced .NET Back-End Developer to build modern, scalable cloud-based solutions using C# and Azure. The role focuses on designing high-performance services, working with CosmosDB, and collaborating in an Agile team with exposure to AI-assisted development tools. This is a fully remote position with competitive hourly rates and long-term cooperation. 🗂️ Requirements: 5+ years of professional experience in .NET development, Strong experience with C#, Proven experience with Azure services, Experience with CosmosDB, Experience with TypeScript or JavaScript, Bachelor’s degree in Computer Science or related field, Ability to align with US-based team working hours, English language proficiency 📃 Skills: .NET, C#, Azure, CosmosDB, TypeScript, JavaScript, AI, Playwright, Selenium, Drupal 🏢 Description: For our client from the technology and industrial solutions sector, we are looking for a .NET Back-End Developer to join a talented development team working on modern, scalable software solutions. Responsibilities: Design, develop, and maintain high-performance back-end services using .NET and C#. Work extensively with Azure cloud services and CosmosDB to build scalable and resilient solutions. Collaborate with front-end developers, product owners, and other team members to integrate back-end services. Participate in code reviews, architectural discussions, sprint planning, and other Agile ceremonies. Use modern development tools and practices to improve productivity, code quality, and maintainability. Explore and apply AI-assisted tools where appropriate to support development, documentation, troubleshooting, and workflow efficiency. Contribute to improving development processes, engineering practices, and team knowledge sharing. Be a proactive problem-solver and continuous learner, staying current with relevant technologies and industry trends. Requirements: Application Development Experience: 5+ years of professional experience in .NET development. Cloud Development Expertise: Proven experience with C#, Azure services, and CosmosDB. Scripting / Front-End Knowledge: Experience with TypeScript preferred, or JavaScript. AI Tool Familiarity: Interest in or hands-on experience using AI tools to support software development, productivity, documentation, research, or troubleshooting. Educational Background: Bachelor’s degree in Computer Science or a related field. Flexibility: Ability to align somewhat with US-based team working hours. Communication: English language proficiency. Stack: Cloud: Azure, CosmosDB Back-End: .NET, C# Scripting / Tooling: TypeScript preferred, JavaScript acceptable Productivity / AI Tools: Familiarity with AI-assisted development or productivity tools is a plus Nice to have: Domain Knowledge: Background in Electrical Engineering or a related technical field. Background or interest in analog and mixed-signal hardware design. Knowledge of hardware or system simulation concepts. CMS Knowledge: Familiarity with Drupal. Test Automation Exposure: Familiarity with tools like Playwright or Selenium. Quality Mindset: Prior QA experience or understanding of QA methodologies is welcome. Offer: Cooperation based on a B2B contract and rate: 140-170 PLN/hour 100% remote work The support of a dedicated mentor. In the relationship, we focus on direct communication. When you join speedapp, you will be put in touch with a dedicated mentor who will make sure that you enjoy working with us and with the client. Events and integration meetings, as well as participation in various initiatives, e.g., sports. Access to the benefits offering (medical care, Multisport card). About Speedapp At speedapp, we believe that an organization is only as good as the people who make it up. We are a team of IT experts and other professionals working for our clients around the world (including Israel, Austria, USA). We go far beyond the HR category. We build IT teams and also help manage them. 👉 10 years of experience 👉 +100 clients worldwide +300 hires per year 💎 We have won the prestigious "Forbes Diamonds" award four times (2022, 2023, 2024, 2025). We are a member of the European Fast Growth Icons network and FinTech Poland. We are ranked 18th among the 100 fastest growing companies 2023 by Clutch.

🏢 Summary: Offer for a .NET Backend Developer focused on building backend services in a microservices and cloud-native environment. The role includes developing REST APIs, API-to-API integrations, data access layers, and collaborating in Scrum teams using modern backend technologies. 🗂️ Requirements: Experience as .NET Backend Developer, Practical knowledge of .NET, Knowledge of Scrum, Practical knowledge of Git, Experience with API-to-API communication, Knowledge of asynchronous programming, Experience designing and implementing REST API, Practical knowledge of Entity Framework, Good knowledge of SQL, Experience with PostgreSQL, Experience with microservices architecture, Knowledge of Cloud Native solutions 📃 Skills: .NET, Scrum, Git, REST, EntityFramework, SQL, PostgreSQL, Microservices, CloudNative, Async, API, AWS, Kubernetes, KQL, SIEM, Elastic, Hangfire, gRPC, GraphQL 🏢 Description: O projekcie Poszukujemy .NET Backend Developera do realizacji projektów opartych o architekturę mikroserwisową i rozwiązania cloud-native. Rola obejmuje rozwój usług backendowych, integrację systemów poprzez API oraz współpracę z zespołem projektowym zgodnie z metodyką Scrum. Twój zakres obowiązków projektowanie i rozwój aplikacji backendowych w technologii .NET implementacja oraz rozwój mikroserwisów tworzenie i rozwój REST API integracja systemów z wykorzystaniem komunikacji API-to-API projektowanie i rozwój rozwiązań opartych o architekturę cloud-native współpraca z zespołem projektowym w metodyce Scrum rozwój oraz utrzymanie warstwy dostępu do danych udział w przeglądach kodu oraz stosowanie dobrych praktyk programistycznych Nasze wymagania doświadczenie jako .NET Backend Developer praktyczna znajomość .NET znajomość metodyki Scrum praktyczna znajomość Git doświadczenie w komunikacji API-to-API znajomość programowania asynchronicznego (Async) doświadczenie w projektowaniu i implementacji REST API praktyczna znajomość Entity Framework dobra znajomość SQL doświadczenie z PostgreSQL doświadczenie w pracy z architekturą mikroserwisową znajomość rozwiązań Cloud Native Mile widziane znajomość AWS doświadczenie z Kubernetes znajomość KQL doświadczenie z SIEM znajomość Elastic znajomość Hangfire doświadczenie z gRPC znajomość GraphQL

🏢 Summary: Senior .NET Developer role focused on building backend microservices and cloud integrations for scalable digital platforms using .NET Core and Azure-related technologies. The position involves developing backend functionalities, partner integrations, search engines, and database optimization in a hybrid or remote work model. 🗂️ Requirements: 5+ years of experience as a Backend .NET Developer, Strong knowledge of .NET Core, Strong knowledge of C#, Experience with SQL Server, Experience creating and optimizing SQL queries, Experience with messaging systems, Business-level Polish communication, Communicative English proficiency, Legal right to work in the European Union 📃 Skills: .NET, C#, SQL, SQLServer, CosmosDB, Azure, AzureServiceBus, EventHub, Kafka, MQ, Elasticsearch, MongoDB, Swagger, OpenAPI, Microservices 🏢 Description: Empower the future of backend development by architecting innovative microservices and seamless cloud integrations! Warszawa-based opportunity with a hybrid work model (1 day in-office per week, typically on Mondays). Fully remote work is also possible but prioritized second. As a Senior .NET Developer – Microservices and Cloud Integration, you will be working for our client, a leader in innovative software solutions. You will contribute to the development of complex backend systems, focusing on microservices architecture and cloud-based integrations, supporting scalable and robust digital platforms. This role offers a path to impactful projects and career growth in a dynamic environment. Your main responsibilities: Design and implement new backend functionalities on the Goodie platform using .NET Core. Develop and maintain microservices and external partner integrations. Implement and enhance content search engines. Work with SQL Server and Cosmos DB for data querying and optimization. Participate in requirement analysis, backlog refinement, and sprint planning. Ensure code quality through unit tests, code reviews, and adherence to best practices. You're ideal for this role if you have: Minimum 5 years of experience as a Backend .NET Developer. Strong knowledge of .NET Core / C#. Experience with SQL Server, including query creation and optimization. Familiarity with messaging systems, preferably Azure Service Bus or Event Hub, or alternative like Kafka or MQ. Proficient communication skills in Polish and English at a business level. It is a strong plus if you have: Experience with Azure AI Search or Elasticsearch. Knowledge of Azure Cosmos DB, MongoDB, or other NoSQL databases. Experience with Azure cloud services (App Services, Functions, Storage, Application Insights, Log Analytics). API documentation skills using Swagger / OpenAPI. Backend development experience for mobile applications. Language Required for the role: Polish (business communication level) and English (communicative 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: Backend Developer role focused on building and evolving a scalable music streaming backend platform. The position involves designing, implementing, and maintaining high-performance backend services that support content discovery and playback in a distributed, high-load environment. You will work in an agile team to deliver reliable, testable, and maintainable solutions. 🗂️ Requirements: Strong experience with .NET and C#, Knowledge of Object-Oriented Design (OOD), Understanding of SOA and SOLID principles, Experience with SQL databases, Experience with NoSQL databases, Ability to design and consume RESTful APIs, Experience with distributed and high-load systems, Familiarity with CI/CD pipelines, Proficiency with Git version control 📃 Skills: .NET, C#, OOD, SOA, SOLID, SQL, NoSQL, REST, CI/CD, Git, Distributed, High-load 🏢 Description: We are looking for a Backend Developer to join the product development of Music Backend (BE) platform . You will be part of a team responsible for building and evolving a scalable streaming platform, delivering product and business improvements in close collaboration with cross-functional teams. Your responsibilities: Contribute to the development and improvement of the backend music streaming platform Design and implement scalable, testable, and maintainable backend solutions using appropriate architectural patterns Collaborate with Product Owners and cross-functional teams to shape user experience Develop and maintain front-facing backend services enabling content discovery and playback Ensure operational stability through monitoring, upgrading, and maintaining backend systems Write high-quality code with a strong focus on performance, reliability, and customer value Explore and apply modern technologies within the backend ecosystem Work in an agile development environment We are looking for you, if you have: Strong experience with .NET / C# Solid understanding of Object-Oriented Design (OOD) , SOA , and SOLID principles Experience with SQL and NoSQL databases Experience designing and consuming RESTful APIs Experience with distributed, large-scale, high-load systems Familiarity with CI/CD pipelines Experience using Git for version control Nice to have Experience with application monitoring (preferably Datadog ) Experience working with MongoDB Knowledge of AWS Experience developing in Python Experience with GraphQL We offer: Participation in interesting and demanding projects Flexible working hours A great, non-corporate atmosphere Stable employment conditions (contract of employment or B2B contract) Opportunities for development and promotion Attractive package of benefits Work model: remote or hybrid (2 days per week from the office) We reserve the right to contact the selected candidates.

🏢 Summary: Backend Developer (.NET) role in a long-term enterprise project focused on development and maintenance of large-scale business systems. The position involves designing and implementing new features, optimizing existing solutions, and ensuring high performance and stability. Hybrid work model with strong emphasis on code quality and system reliability. 🗂️ Requirements: Experience with C#, Knowledge of .NET Core / .NET 6+, Experience with ASP.NET / ASP.NET Core (MVC, Web API), Experience with Entity Framework / EF Core (migrations, query optimization), Experience with MS SQL Server (T-SQL, stored procedures, indexes, optimization), Experience with migration scripts and Entity Framework, Experience with SQL Server Agent Jobs, Knowledge of HTML5 and CSS3, Experience with JavaScript and jQuery, Knowledge of Bootstrap, Experience with IIS configuration and manual deployments, Ability to monitor logs and diagnose errors, Knowledge of Windows Server, Experience with REST and SOAP, Knowledge of JSON and XML, Experience with GIT 📃 Skills: C#, .NET, ASP.NET, MVC, WebAPI, EF, SQL, TSQL, MSSQL, HTML5, CSS3, JavaScript, jQuery, Bootstrap, IIS, WindowsServer, REST, SOAP, JSON, XML, GIT 🏢 Description: Dla naszego klienta poszukujemy Backend Developera (.NET) do długoterminowego projektu związanego z rozwojem i utrzymaniem systemów biznesowych o dużej skali. Rola obejmuje projektowanie i rozwój nowych funkcjonalności, optymalizację istniejących rozwiązań oraz współpracę z zespołami frontendowymi i infrastrukturalnymi. Projekt realizowany jest w środowisku enterprise, z naciskiem na jakość kodu, wydajność oraz stabilność systemów. Tryb pracy Praca hybrydowa: 3 dni pracy zdalnej 2 dni pracy w biurze w Warszawie Start Od zaraz (możliwość dopasowania terminu rozpoczęcia dla odpowiedniego kandydata) Wymagane kompetencje Backend / .NET Wymagane: C#, .NET Core / .NET 6+ ASP.NET / ASP.NET Core (MVC, Web API) Entity Framework / EF Core (migracje, optymalizacja zapytań) Mile widziane: .NET Framework 4.8 REST / SOAP Programowanie asynchroniczne i wielowątkowe Znajomość zasad SOLID i wzorców projektowych WCF, WinForms, WPF Office Interop / COM Interop Bazy danych Wymagane: MS SQL Server (T-SQL, procedury składowane, indeksy, optymalizacja) Skrypty migracyjne, praca z Entity Framework SQL Server Agent Jobs (harmonogramowanie i automatyzacja zadań) Mile widziane: SSIS (ETL) SAS, PostgreSQL, Oracle, Teradata Frontend Wymagane: HTML5, CSS3 JavaScript, jQuery Bootstrap DevOps / Utrzymanie Wymagane: IIS (konfiguracja, wdrożenia manualne) Monitorowanie logów i diagnostyka błędów Windows Server Mile widziane: WPF / WinForms (aplikacje desktopowe) Podstawy UNIX Dodatkowe kompetencje Komunikacja międzyserwisowa (REST, SOAP, JSON, XML) GIT

🏢 Summary: Backend Tech Lead role focused on leading and implementing a strategic rewrite of a core financial platform module into a modern, scalable architecture. The position combines hands-on Java/Spring Boot development with architectural decision-making, API design, and integration across multiple enterprise banking systems. It involves designing high-performance backend services handling large transactional and reporting datasets. 🗂️ Requirements: 7+ years backend or fullstack development experience, Strong Java expertise, Strong Spring Boot expertise, Experience designing REST APIs, Experience as Tech Lead or technical owner, Experience designing scalable and distributed systems, Strong relational database design skills (PostgreSQL), Experience with Elasticsearch or similar search technology, Experience integrating external systems via REST or GraphQL, Experience with Docker and Kubernetes, Experience with CI/CD pipelines, Knowledge of OAuth2 and OIDC, Working knowledge of React, Working knowledge of TypeScript, Experience handling large datasets with complex queries, Ability to lead architecture and mentor developers 📃 Skills: Java, Spring, SpringBoot, REST, GraphQL, PostgreSQL, Elasticsearch, Docker, Kubernetes, CI/CD, OAuth2, OIDC, React, TypeScript, SQL, Microservices, DistributedSystems 🏢 Description: Our client is an international financial technology company building solutions that support transaction communication, balances visibility, reporting, and integrations across multiple banking systems . We are looking for a Backend Tech Lead to join a strategic rewrite of a core platform module. The role combines technical leadership with hands-on backend development , helping redesign a legacy component into a modern, scalable architecture. You will work closely with product stakeholders, platform engineers, and frontend teams to design and implement reliable, high-performance backend services that integrate multiple enterprise systems. IN SHORT: 🌍 Remote work or on-site (Wrocław, Bielsko-Biała) – your choice! 💰 170 - 190 PLN/h + VAT ☑️ B2B contract Your Daily Missions Lead the design and development of backend services for a core platform rewrite. Design scalable services responsible for transactions, balances, statements, and reporting data . Define API contracts and integration patterns between backend services, frontend applications, and external enterprise systems. Make key decisions around data modeling, search/indexing strategies, and performance optimization for million-row datasets with complex filtering, sorting, and pagination . Support frontend teams by ensuring API-first design and smooth integration with React applications . Ensure engineering quality through code reviews, architecture discussions, and mentoring other developers . Collaborate closely with product, frontend, and platform teams to deliver robust, production-ready systems . The Essentials We're Seeking 7+ years of experience in backend or fullstack software development. Strong expertise in Java and Spring Boot , including designing modular backend services and REST APIs. Experience acting as a Tech Lead or technical owner responsible for architectural decisions. Solid experience designing scalable APIs and distributed systems . Strong understanding of data modeling in relational databases (e.g., PostgreSQL) and designing efficient query patterns. Practical experience with Elasticsearch (or similar search/indexing technologies) for filtering, search, and aggregation over large datasets. Experience designing hybrid data architectures combining multiple data sources . Experience working with external system integrations , including REST or GraphQL APIs. Familiarity with containerized environments (Docker, Kubernetes) and modern CI/CD pipelines. Understanding of security patterns in enterprise systems (OAuth2, OIDC, authentication and authorization flows). Working knowledge of React and TypeScript , enabling effective collaboration with frontend teams. Proven ability to break down complex architectural changes into manageable development phases . Experience using AI-assisted development tools (e.g., Cursor, Claude Code, or similar agentic coding tools) and openness to experimenting with AI-driven approaches to improve development efficiency and engineering workflows . Ability to combine hands-on engineering with technical leadership and mentoring . Nice-to-Haves Experience in FinTech, banking, or enterprise integration platforms . Experience with large-scale transactional or reporting systems . Experience with GraphQL integrations . Experience with data migration or legacy system modernization . Experience designing API-first platforms . Familiarity with observability practices (logging, metrics, tracing). Understanding of database partitioning and query optimization patterns . Reasons Why You Would Enjoy Working With Us We work in the latest technologies and with international clients, and our projects are polished from < to /> - learn about some of the projects we have completed. We organize TechTalks, meet-ups and create guilds where we exchange knowledge - you can learn a lot from your teammates. We have a close-knit team and we make sure to have regular integrations - we often go out to celebrate together. You can work remotely or choose to work from our offices in Wroclaw or Bielsko-Biala. However, we count on your openness to occasionally visit the office for team meetings or client visits, or possible occasional trips to the client's headquarters. You can adjust your working hours to suit your needs, starting your day between 7:00 and 10:00 am. You can work with great specialists in their fields who also have a sense of humor and other after-hours hobbies. It is the people who create the unique atmosphere and relaxed atmosphere at CSHARK. We have a flat structure - we are not a corporation and don't want to be one 🙃. We offer bonuses for employee referrals (from 3000 PLN to 7000 PLN). We organize remote English classes and provide access to the company library. You can also become an author/author of articles published on our technical blog - https://cshark.com/blog/ .

🏢 Summary: The offer is for a .NET Developer to join a backend team building and enhancing systems that support business operations, integrations, and data processing in an international environment. The role focuses on developing high-performance .NET applications, designing APIs, and collaborating within a mixed .NET and Java ecosystem. It includes work on integrations, CI/CD processes, and cooperation with distributed teams in a hybrid work model. 🗂️ Requirements: Minimum 3 years of professional experience in .NET development, Strong knowledge of C#, Experience with Java, Experience in backend development and API creation, Working knowledge of relational databases, Familiarity with Git, Experience working in Agile/Scrum teams, English proficiency at B2 level or higher 📃 Skills: .NET, C#, Java, REST, Git, SQL, MS SQL Server, SQLite, PostgreSQL, CI/CD 🏢 Description: 📍Contract of Employment 📍Gliwice - hybrid (50%) 📍17.000 - 21.000PLN gross monthly Position Overview We are seeking a .NET Developer to join a backend team responsible for building and enhancing systems that support business operations, integrations, and data processing in our client’s international environment. This role focuses mainly on .NET technologies while offering opportunities to collaborate within a broader ecosystem that also includes Java-based solutions. What You’ll Be Working On Developing, maintaining, and optimizing backend applications built on .NET to ensure high performance and reliability Designing and implementing APIs that meet business and technical expectations Analyzing requirements and delivering new features, improvements, and system enhancements Supporting and expanding existing solutions Creating and managing integrations with internal and external systems Troubleshooting issues, performing root-cause analysis, and ensuring long-term stability Cooperating with distributed teams across locations such as Poland and Germany Participating in code reviews and shaping coding standards and best practices Preparing and maintaining clear, structured technical documentation Supporting deployment processes and contributing to CI/CD pipelines What We Expect From You At least 3 years of professional experience in .NET development Strong command of C# Experience with Java and readiness to work in a combined .NET + Java ecosystem Experience in backend development and API creation Working knowledge of relational databases Familiarity with Git Experience in Agile/Scrum teams Strong communication skills and readiness to collaborate in an international setting English at B2 level or higher Technology Environment .NET (including .NET Framework, .NET Core, .NET 5+) C# REST APIs Git Databases such as MS SQL Server, SQLite, PostgreSQL CI/CD tools and pipelines Hays Poland sp. z o.o. jest agencją zatrudnienia zarejestrowaną w rejestrze prowadzonym przez Marszałka Województwa Mazowieckiego pod numerem 361.

🏢 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: The offer is for a .NET Developer responsible for building and enhancing scalable backend systems and REST APIs for global travel platforms. The role involves contributing to architecture, optimizing performance, and collaborating in an agile environment to deliver reliable, high-quality software. It includes hybrid work, international projects, and professional development opportunities. 🗂️ Requirements: Minimum 3 years of commercial experience with .NET development, Strong knowledge of ASP.NET MVC, Experience developing REST APIs, Experience working in agile software development teams, Good knowledge of MS SQL, Good knowledge of Elasticsearch, Experience with CI/CD tools (Git, TeamCity or similar), Experience writing unit and integration tests, Ability to write clean, maintainable, and well-tested code, Very good English communication skills 📃 Skills: .NET, ASP.NET, MVC, REST, MS SQL, Elasticsearch, Git, TeamCity, CI/CD, UnitTesting, IntegrationTesting, Umbraco, Angular, AWS 🏢 Description: We are looking for a .NET Developer to join our team and help build scalable, high-quality solutions that power our global travel platforms. In this role, you will work on the development and enhancement of backend systems, contribute to architectural decisions, and collaborate with cross-functional teams to deliver reliable and efficient software used by customers worldwide. Your responsibilities Design, develop, and maintain applications using .NET technologies Translate business requirements into scalable and maintainable technical solutions Develop and enhance REST APIs and backend services Maintain, troubleshoot, and improve existing applications Refactor and optimize code to improve performance, scalability, and maintainability Write clean, well-structured, and testable code following best practices Participate in code reviews and contribute to improving development standards Identify and resolve performance bottlenecks and system issues Contribute to application architecture, technical design, and system documentation Collaborate closely with developers, QA engineers, Product Owners, and other stakeholders in an agile environment Our requirements At least 3 years of commercial experience with .NET development Strong knowledge of ASP.NET MVC and REST APIs Experience working within agile software development teams Good knowledge of MS SQL and Elasticsearch Experience with CI/CD tools and practices (Git, TeamCity or similar) Experience writing unit and integration tests Ability to write clean, maintainable, and well-tested code Very good English communication skills Nice to have Experience with Umbraco CMS Experience with Angular Knowledge of AWS services and cloud-based solutions How we work Clean Code principles Design patterns and software engineering best practices Code reviews and knowledge sharing Static code analysis Continuous Integration and Continuous Deployment (CI/CD) Agile and collaborative development environment What we offer Hybrid work model (1–2 days per week in our Katowice office) Opportunity to work on international, large-scale projects Attractive remuneration paid in EUR Flexible working hours Individual development budget Partially or fully funded training and certifications English lessons Mentoring and support from experienced technical leaders Participation in conferences in Poland and abroad A culture focused on learning, collaboration, and knowledge sharing Space to innovate and bring your own ideas to life Support for IT community initiatives

🏢 Summary: Long-term backend role focused on building and maintaining system integrations in an Azure-native environment using C#/.NET. The position involves developing APIs and microservices, working with cloud services, and improving CI/CD and Infrastructure as Code solutions within an Agile/SAFe setup. The project connects internal and external systems to support real business operations. 🗂️ Requirements: Minimum 3 years of experience as a Backend or .NET Developer, Strong experience with C# and .NET 6+, Experience building and maintaining system integrations, Hands-on work with REST APIs, message queues, FTP, microservices, Experience with Azure or other cloud platforms (AWS, GCP), Basic knowledge of Infrastructure as Code, Experience with CI/CD pipelines, Experience working in distributed systems or microservices architecture 📃 Skills: C#, .NET, Azure, AWS, GCP, REST, APIs, Microservices, MessageQueues, FTP, Terraform, Bicep, Pulumi, AzurePipelines, GitHubActions, GitLabCI, Jenkins, TeamCity 🏢 Description: Do you want to build integrations that power real business operations across the globe? Are you ready to work in an Azure-native environment where you can grow your skills in cloud, messaging, and microservices? If you enjoy learning on the job and working closely with business and Scrum teams, this project could be a great fit. Join a long-term integration team in Poland, contributing to solutions that connect systems for clients, partners, and internal teams. Key responsibilities Develop backend applications in C# / .NET Build and maintain integrations between systems (APIs, messaging, microservices) Work with cloud services (mainly Azure) Support and improve CI/CD pipelines and Infrastructure as Code (IaC) solutions Troubleshoot and resolve integration issues Collaborate with other application teams in an Agile/SAFe-based environment Ideal candidate profile At least 3 years of experience as a backend or .NET developer Practical experience with C# and .NET (6+) Experience with system integrations (REST APIs, message queues, FTP, microservices) Familiarity with cloud platforms (Azure preferred, AWS/GCP acceptable) Basic understanding of Infrastructure as Code (Azure Bicep, Terraform, Pulumi) and CI/CD pipelines (Azure Pipelines, GitHub Actions, GitLab CI/CD, Jenkins, TeamCity) Comfortable working in a distributed systems / microservices environment Team-oriented, communicative, and eager to learn from both business and technical teams Conditions Location: Gdańsk (Olivia Centre) Work model: Hybrid (2-3 days in the office) Employment type: B2B Project duration: Long-term cooperation expected; the first contract for 6-12 months Salary: 100-150 PLN/h Recruitment steps Initial call with a KUBO recruiter Interviews with the client Decision and feedback