Senior Software Engineer (.NET / Windows)

🏢 Summary: Senior Software Engineer role focused on developing and maintaining a complex enterprise .NET platform, combining backend development, production troubleshooting, and performance optimization. The position involves working on identity-related systems and improving architecture, reliability, and code quality within a large-scale environment. The engineer will contribute to technical decisions and future platform evolution. 🗂️ Requirements: 5+ years commercial experience with C# and .NET, Strong knowledge of ASP.NET Core, Experience with asynchronous programming, Experience with dependency injection, Hands-on experience with Entity Framework Core, Strong understanding of SQL Server, Experience with query optimization, Experience with OAuth2, Experience with OpenID Connect, Experience with JWT, Experience supporting and troubleshooting production systems, Fluent English 📃 Skills: C#, .NET, ASP.NET, EntityFramework, SQLServer, OAuth2, OpenIDConnect, JWT, IdentityServer, Duende, ActiveDirectory, AzureAD, MicrosoftGraph, Quartz.NET, SignalR, Playwright, AzureDevOps, CI/CD 🏢 Description: We are looking for an experienced Senior Software Engineer to develop and maintain a complex enterprise .NET platform used by global organizations. This role combines backend development , production troubleshooting , performance optimization , and work on identity-related systems . 💼 Responsibilities: Design, develop, and maintain backend services built with C# and .NET Investigate and resolve complex production issues and customer-reported problems Optimize application performance, database queries, and system reliability Collaborate with Product, Support, and Engineering teams on technical solutions Improve architecture, code quality, and engineering standards Participate in technical discussions and contribute to future platform development ✅ Requirements: 5+ years of commercial experience with C# and .NET Strong knowledge of ASP.NET Core and modern .NET applications Experience with asynchronous programming and dependency injection Hands-on experience with Entity Framework Core Good understanding of SQL Server, query optimization, and database performance Experience with OAuth2, OpenID Connect, JWT Experience supporting and troubleshooting production systems Fluent English communication skills 🌟Nice to have: Experience with IdentityServer / Duende IdentityServer Understanding of Active Directory, Azure AD or Microsoft Graph Hands-on experience with Quartz.NET or similar scheduling frameworks Familiarity with SignalR, Playwright, Azure DevOps and CI/CD pipelines 🎁 We offer: Work on a mature enterprise product used globally Influence technical decisions and platform evolution Private healthcare Life insurance Multisport Opportunity to work with modern .NET technologies and large-scale systems

🏢 Summary: Remote B2B opportunity for a Senior Software Engineer focused on developing complex, high-performance systems in modern C++ within Linux environments. The role involves contributing to product-level features, collaborating across teams, and working with cloud and backend technologies. Long-term cooperation with flexibility on financial expectations and start date. 🗂️ Requirements: 6+ years of hands-on experience in C++ development, Strong knowledge of modern C++, Experience with multithreading, Understanding of memory management, Experience with performance optimization, Strong understanding of Linux-based systems, Experience developing in Linux environment, Ability to deliver complex technical features, Bachelor’s degree in Science, Technology, Engineering or related field 📃 Skills: C++, Linux, Multithreading, MemoryManagement, PerformanceOptimization, Python, Go, AWS, Terraform, CloudFormation, REST, CI/CD, GitHub, Jenkins, Artifactory, Ansible, Networking, Security, Databases 🏢 Description: For our client, we are looking for a Senior Software Engineer (f/m/n). Qualifications 6+ years of hands-on experience in C++ development (modern C++ preferred) with a solid understanding of multithreading, memory management, and performance optimization Strong experience contributing to complex features with a good product-level understanding and exposure to diverse technologies Proven ability to collaborate effectively within a team, actively participating in technical discussions and supporting delivery across multiple contributors Strong understanding of Linux-based systems and experience developing in a Linux environment (user level) Demonstrated ability to take ownership of well-defined technical tasks and drive them to completion with high quality Strong interpersonal skills with the ability to communicate clearly, collaborate effectively, and contribute confidently in professional discussions Proven ability to quickly learn and adapt to new technologies, taking on tasks with a proactive, can-do attitude and a willingness to expand beyond the core tech stack, including Python, AWS and Go Highly self-managed and independent, capable of delivering results with limited supervision while aligning with broader team goals Bachelor’s degree in Science/Technology/Engineering or a related field How will you stand out from the crowd Experience with Go and/or Python programming languages Experience with cloud-native development and infrastructure-as-code tools (e.g., Terraform, CloudFormation) Experience in enterprise-scale application development in cloud or SaaS environments (AWS serverless architecture is a definite advantage) Experience in building fullstack applications, including REST API-based backend systems and modern frontend interfaces Familiarity with networking protocols, security principles, and database systems Experience with modern CI/CD pipelines, such as GitHub, Jenkins, Artifactory, and Ansible We offer: Work model: remote Contract type: B2B with SHIMI Long-term cooperation We are open to the candidate’s financial expectations Start: ASAP (up to 1 month notice)

🏢 Summary: Senior Software Engineer role focused on designing, building, and scaling secure enterprise web applications and high-performance SaaS platforms. The position covers backend APIs, microservices, testing, technical leadership, and Azure-based CI/CD delivery within Agile teams. 🗂️ Requirements: 6+ years of full-lifecycle software development experience, Experience developing and maintaining large-scale web applications and SaaS solutions, Strong proficiency in C#, .NET Core, and .NET Framework, Hands-on experience with Azure Cloud services, RESTful architectures, and CI/CD pipelines, Experience with NUnit, Moq, Jest, and Git, Strong problem-solving and technical communication skills 📃 Skills: C#, .NET, Azure, REST, Microservices, NUnit, Moq, Jest, Git, CI/CD, SaaS 🏢 Description: We are looking for a skilled and passionate Senior Software Engineer to join the core engineering team. In this role, you will play a key part in designing, building, and scaling enterprise-grade web applications and high-performance SaaS solutions. If you have a strong foundation in Microsoft technologies, cloud architecture, and modern engineering practices—and love solving complex technical challenges—we would love to hear from you! Key Responsibilities Architecture & Development - Design, build, and maintain scalable, secure, and resilient web applications and SaaS platforms. API & Backend Systems - Implement and optimize RESTful APIs, microservices, and Web API integrations. Quality & Testing - Drive software quality by writing comprehensive unit tests using NUnit, Moq, and Jest, and advocate for test-driven practices. Technical Leadership - Participate in code reviews, architectural discussions, and technical planning to ensure clean, maintainable code. Agile Collaboration - Work closely with cross-functional teams using Agile methodologies to deliver features iteratively and efficiently. DevOps & Version Control - Utilize Git and Azure DevOps for continuous integration, project tracking, and modern deployment pipelines. Key Requirements Experience - 6+ years of hands-on experience in full-lifecycle software development. SaaS & Web Architecture - Proven track record of developing and maintaining large-scale web applications and SaaS solutions. Core Tech Stack - Strong proficiency in C#, .NET Core, and .NET Framework. Cloud & DevOps - Hands-on experience with Azure Cloud services, RESTful architectures, and CI/CD pipeline concepts. Testing & Tools - Solid experience with unit testing frameworks: NUnit, Moq, and Jest; and version control with Git. Communication - Excellent problem-solving skills and the ability to articulate technical concepts clearly to team members. Nice to Have Agile Frameworks - Experience working within a SAFe (Scaled Agile Framework) environment. Mentorship - Passion for coaching junior developers and fostering team growth.

🏢 Summary: Senior Software Engineer role focused on building and scaling a high-performance, AI-supported trade management platform using Rust and C#. The position involves designing distributed, event-driven systems with strong emphasis on performance, scalability, and reliability. The engineer will own solutions end-to-end and optimize cloud-based backend systems. 🗂️ Requirements: 5+ years of software engineering experience, Strong system design knowledge, Strong understanding of concurrency, Strong understanding of performance optimization, Hands-on Rust experience in production, Familiarity with C#/.NET, Experience with distributed systems, Experience with cloud platforms (preferably AWS), Practical use of AI tools in development workflows 📃 Skills: Rust, C#, NET, AWS, Kafka, RabbitMQ, AI, DistributedSystems, Concurrency, PerformanceOptimization 🏢 Description: Senior Software Engineer C# (AI-driven systems) We are looking for an experienced Software Engineer who combines strong system design skills with a modern, AI-supported development approach. This role focuses on building and scaling a high-performance trade management platform, primarily in Rust, with some exposure to C#/.NET. You will work on distributed, event-driven systems processing large volumes of data, with a strong focus on performance, scalability, and reliability. Key Responsibilities Develop and optimize high-performance backend systems Design and maintain scalable distributed services Use AI tools to accelerate development, testing, and debugging Own solutions end-to-end, from design to production Improve system performance and cloud efficiency Requirements 5+ years of experience in software engineering Strong fundamentals in system design, concurrency, and performance Hands-on experience with Rust (production level) Familiarity with C#/.NET Experience with distributed systems and cloud (preferably AWS) Practical use of AI tools in development workflows Nice to have Experience with messaging systems (Kafka, RabbitMQ, etc.) Exposure to financial systems or trading environments

🏢 Summary: Senior Software Engineer role focused on developing and maintaining internal forecasting and demand management products for offshore wind operations using Angular and .NET. The position involves close collaboration with cross-functional teams, delivering high-quality increments, and improving product functionality and user experience. The role requires active participation in Agile processes and code quality assurance. 🗂️ Requirements: 7–10 years experience with Angular and .NET development, Strong proficiency in .NET Core and C#, Experience with Microsoft and Azure deployment pipelines, Experience working in Agile/Scrum environments, Ability to conduct code reviews and maintain clean code standards, Understanding of user-centered design principles 📃 Skills: Angular, .NET, .NETCore, C#, Azure, Microsoft, Scrum, Agile, UX, CI/CD 🏢 Description: Introduction & Summary: We are seeking a Senior Software Engineer with extensive experience in Angular and .NET technologies. The ideal candidate will play a key role in developing and maintaining internal products utilized for forecasting and managing demands in offshore wind operations. In this role, you will work collaboratively within a team, contributing to product improvements and ensuring user satisfaction. Main Responsibilities: As a Senior Software Engineer, your core responsibilities will include: Delivering quality increments through collaboration with the development team and stakeholders. Understanding and connecting business needs with user requirements and frontend implementations. Actively participating in Scrum ceremonies and backlog refinements. Conducting code reviews to ensure high coding standards and provide constructive feedback. Identifying and advocating for improvements in the codebase and product functionality. Collaborating with UX designers to refine user experience based on usability testing. Key Requirements: 7-10 years of experience in design and development using Angular and .NET technologies. Proficient in managing deployments via Microsoft and Azure pipelines. Strong understanding of user-centered design principles. Experience in Agile/Scrum environments, with a comprehensive understanding of the development lifecycle. Creativity and drive for product improvement. Proficient in .NET Core, C#, and clean code principles. Nice to Have: Experience in Agile/Scrum environments. Familiarity with UX design principles. Experience in usability testing. Start: July 2026 Duration: Jun 2027 Location: Greater Copenhagen Area Onsite/remote: min. 3 days onsite per week

🏢 Summary: Senior Software Engineer role focused on developing and maintaining secure encryption infrastructure across Windows, Linux, and cloud environments. The position involves backend and driver development, Windows application enhancement, CI/CD automation, and server management to support critical production systems. The role combines embedded systems, hardware-software integration, and cloud-based infrastructure in a hybrid Warsaw-based setup. 🗂️ Requirements: Engineering Degree in Electronics or Computer Science, Minimum 5 years of experience in IT, automation, software engineering, or electronics, Strong proficiency in IP networking, Strong knowledge of computer systems, Experience with database management, Proven troubleshooting skills in Python and C++, Experience working in Windows and Linux environments, Fluency in English, Fluency in Polish, Legal right to work in the European Union 📃 Skills: Python, C++, JavaScript, Node.js, Express, Windows, Linux, AWS, Azure, CI/CD, IP, VPN, PKI, SQL, Batch 🏢 Description: Ignite Innovation in Embedded Systems — Redefine the Future of Connectivity and Security! Warsaw-based opportunity with hybrid work model. As a Senior Software Engineer , you will be working for our client, a leading company in the manufacturing industry, focused on the development and deployment of critical encryption infrastructure. You will play a vital role in maintaining and advancing secure server and device solutions across Windows, Linux, and cloud environments. Join us to push the boundaries of hardware-software integration, ensuring robust security and operational excellence in high-stakes production lines. This is your chance to be part of pioneering technological progress. Your main responsibilities: Develop backend solutions in Python and hardware device drivers to support encryption systems. Create new Windows applications based on existing modules, extending functionality and performance. Enhance frontend components mainly supporting existing JavaScript modules in Node.js/Express. Automate CI/CD workflows, develop tests, and streamline deployment processes. Support and improve Windows batch scripts, deploy Windows services, and troubleshoot related applications. Diagnose and resolve issues within Python, JavaScript, and C++ codebases. Identify system risks, propose mitigation strategies, and implement solutions to prevent future problems. Collaborate directly with product development teams on evolving existing solutions and developing new products. Manage Windows and Linux servers on-premises and in the cloud, overseeing network configurations and VPN connectivity. Navigate and maintain cloud-based systems, primarily AWS and Azure. Conduct upgrades and deployment of encryption infrastructure on new production lines. Occasionally travel domestically and internationally (up to 5%). You're ideal for this role if you have: An Engineering Degree in Electronics or Computer Science. At least 5 years of hands-on experience in IT, automation, software engineering, or electronics. Strong proficiency in IP Networking, computer systems, and database management. Proven troubleshooting skills in Python and C++, with experience in Windows and Linux environments. Ability to proactively identify risks and craft effective solutions. Excellent communication and collaboration skills for working with international teams. Fluency in English, both spoken and written, for technical documentation and team interactions. It is a strong plus if you have: (optional) Experience working with Azure or AWS cloud platforms. Background in PKI system development. Language Required for the role: Fluent in English and Polish. 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 Senior Software Engineer role building a cloud-based financial data platform from scratch. The position focuses on designing and developing scalable, real-time data processing solutions in Azure with strong influence on architecture and engineering standards. You will create backend services and data pipelines in a modern, evolving data environment. 🗂️ Requirements: Strong programming skills in Python or Java or C#, Experience with cloud platforms (Azure preferred), Experience building backend services or data processing components, Experience working with data pipelines and ensuring data consistency, Understanding of software design and clean code principles, Experience with CI/CD pipelines, Experience with version control systems 📃 Skills: Python, Java, C#, Azure, Cloud, CI/CD, Backend, Datapipelines 🏢 Description: As a Senior Software Engineer, you’ll be working on data-driven solutions within the financial data and analytics space. This is a long-term collaboration on a project being built from scratch, giving you real influence over architecture, technology choices, and engineering standards from day one. You’ll be shaping platforms that process large-scale, real-time data used across global financial systems, in a modern and evolving data environment. Key responsibilities Design and develop scalable solutions in cloud environment (Azure) Build and maintain data processing components and services Work with data pipelines and ensure data consistency across systems Develop cloud-based applications and services Collaborate with Engineering, Architecture and Product teams Contribute to clean code, CI/CD, automation and system reliability Take part in code reviews and technical discussions Ideal candidate profile Strong programming skills in Python or Java or C# Experience working with cloud platforms (Azure preferred) Experience in building backend services or data processing components Understanding of software design, clean code and good engineering practices Experience with CI/CD pipelines and version control systems Ability to work independently and as part of a team Good communication skills Nice to have Experience with Spark / PySpark / Databricks Experience with data platforms or data engineering concepts Familiarity with event-driven architectures (Kafka, Event Hubs or similar) Experience with Azure data ecosystem (e.g. Fabric) Experience with containers / Kubernetes (AKS) Conditions Form of cooperation: UoP + KUP 50% Salary range: 18 000 - 30 000 PLN gross/month + yearly bonus depends on the results Hybrid work model: 3 days per week in the Gdynia office Benefits: private medical care, Multisport card, employee pension scheme Recruitment steps Call with a KUBO recruiter (approx. 30 min.) Interview with the client (max. 2 rounds) Decision and feedback

🏢 Summary: Senior Software Engineer role focused on developing and maintaining C#/.NET desktop applications for manufacturing and testing systems, including GUI development and hardware integration. The position combines desktop software engineering with Python-based test automation and parallel execution support in complex technical environments. 🗂️ Requirements: Strong experience with C# and .NET, Experience in desktop application development, Experience with WPF and MVVM, Experience with hardware integration and instrument control, Experience integrating Python scripts with .NET applications, Knowledge of multithreading and thread safety, Ability to troubleshoot using logs and system traces 📃 Skills: C#, .NET, WPF, MVVM, Python, Multithreading, GUI, Desktop, Hardware, Automation 🏢 Description: We are looking for a Senior Software Engineer to join a team developing advanced desktop applications for manufacturing and testing environments. This role is a good fit for someone who has strong experience with C#/.NET, enjoys solving complex technical problems, and is interested in combining software development with Python based test automation and hardware integration. ✅ Your responsibilities: Develop and maintain C# / .NET desktop applications for manufacturing and testing systems Build GUI features using WPF / MVVM Work with hardware integration, instrument control and automated test execution Integrate Python-based test scripts into .NET applications Support parallel execution, thread safety and application stability Troubleshoot issues using logs, traces and system data 🧠 Our requirements: Develop and maintain C# / .NET desktop applications for manufacturing and testing systems Build GUI features using WPF / MVVM Work with hardware integration, instrument control and automated test execution Integrate Python-based test scripts into .NET applications Support parallel execution, thread safety and application stability Troubleshoot issues using logs, traces and system data 🌟 What we offer: Private healthcare Multisport Life insurance Real influence on technical decisions Opportunity to work on a modern AI / ML product platform

🏢 Summary: Senior Software Engineer role focused on developing and maintaining advanced C#/.NET desktop applications for manufacturing and testing environments. The position combines WPF/MVVM GUI development, hardware integration, and integration of Python-based test automation within .NET systems. It involves ensuring application stability, parallel execution, and troubleshooting complex technical issues. 🗂️ Requirements: Strong experience with C# and .NET, Experience developing desktop applications, Proficiency in WPF, Knowledge of MVVM pattern, Experience with hardware integration, Experience with instrument control, Experience with automated test execution, Ability to integrate Python scripts with .NET applications, Understanding of multithreading and thread safety, Ability to troubleshoot using logs and traces 📃 Skills: C#, .NET, WPF, MVVM, Python, Multithreading, Threading, GUI, Hardware, Automation 🏢 Description: We are looking for a Senior Software Engineer to join a team developing advanced desktop applications for manufacturing and testing environments. This role is a good fit for someone who has strong experience with C#/.NET, enjoys solving complex technical problems, and is interested in combining software development with Python based test automation and hardware integration. ✅ Your responsibilities: Develop and maintain C# / .NET desktop applications for manufacturing and testing systems Build GUI features using WPF / MVVM Work with hardware integration, instrument control and automated test execution Integrate Python-based test scripts into .NET applications Support parallel execution, thread safety and application stability Troubleshoot issues using logs, traces and system data 🧠 Our requirements: Develop and maintain C# / .NET desktop applications for manufacturing and testing systems Build GUI features using WPF / MVVM Work with hardware integration, instrument control and automated test execution Integrate Python-based test scripts into .NET applications Support parallel execution, thread safety and application stability Troubleshoot issues using logs, traces and system data 🌟 What we offer: Private healthcare Multisport Life insurance Real influence on technical decisions Opportunity to work on a modern AI / ML product platform

🏢 Summary: Senior Software Engineer role focused on designing and developing scalable backend and fullstack applications using modern C++ in Linux environments. The position involves performance optimization, concurrency, and cloud-native technologies while contributing to high-impact product features. It requires strong ownership, collaboration, and the ability to work across diverse technologies including cloud and DevOps tools. 🗂️ Requirements: 6+ years of C++ development experience, Strong knowledge of multithreading, Strong knowledge of memory management, Experience with performance optimization, Experience developing backend systems, Experience with REST APIs, Experience working in Linux environments, Ability to design and maintain scalable systems, Bachelor’s degree in STEM field 📃 Skills: C++, Linux, REST, Multithreading, AWS, Python, Go, Terraform, CloudFormation, GitHub, Jenkins, Artifactory, Ansible 🏢 Description: Senior Software Engineer – C++ We are looking for a talented Senior Software Engineer to join our team. This role is ideal for someone with deep experience in C++ development , backend skills, and exposure to cloud-native technologies. You will work on challenging projects, contribute to high-impact features, and help shape the future of our products. What You’ll Do Design, develop, and maintain scalable backend systems in C++ (modern C++ preferred) Work on fullstack applications , including REST API-based backend services Optimize software for performance, concurrency, and memory efficiency Develop and maintain applications in Linux environments Take ownership of technical tasks, delivering high-quality results independently Collaborate closely with cross-functional teams, contributing to design and technical discussions Explore new technologies and expand beyond your primary stack, including Python, Go, and AWS Apply a product-focused mindset, understanding the business impact of your technical decisions What We’re Looking For 6+ years of hands-on experience in C++ development Solid understanding of multithreading, memory management, and performance optimization Strong experience contributing to complex features with exposure to diverse technologies Proven ability to work effectively in a team and communicate clearly Experience with Linux-based systems and development in Linux environments Self-motivated, independent, and capable of delivering results with limited supervision Bachelor’s degree in Science, Technology, Engineering, or a related field Nice to Have Experience with Go and/or Python Knowledge of cloud-native development and Infrastructure-as-Code tools (Terraform, CloudFormation) Background in enterprise-scale applications or AWS serverless architectures Familiarity with networking protocols, security best practices, and database systems Experience with modern CI/CD pipelines (GitHub, Jenkins, Artifactory, Ansible)