Engineering Team Leader (.NET / C#)

🏢 Summary: Hybrid Engineering Team Leader (.NET/C#) role focused on leading a development team and ensuring high-quality delivery of proprietary backup and disaster recovery products. Combines people management with partial hands-on development and ownership of end-to-end product execution. Strong emphasis on engineering standards, collaboration, and technical excellence. 🗂️ Requirements: Minimum 2 years experience leading development team (min. 3 people), Minimum 5 years commercial experience with .NET and C#, Strong knowledge of OOP principles, Strong knowledge of SOLID principles, Knowledge of design patterns, Experience with SQL databases, Knowledge of Git, Knowledge of Jira, Knowledge of Docker, Good knowledge of Windows, Good knowledge of Linux, English B2 level, Polish B2 level 📃 Skills: .NET, C#, OOP, SOLID, SQL, Git, Jira, Docker, Windows, Linux, NoSQL, Kubernetes, VMware, Hyper-V, S3, SignalR, TeamCity 🏢 Description: For our Client operating in the backup & disaster recovery domain, we are looking for a .NET Team Leader who will take on a key leadership role within a growing R&D organization. The company develops its own proprietary products , used globally — including by Fortune 500 companies — and is currently in a phase of strong growth and expansion of its engineering teams. This is an environment where you can have a real impact on the product, people, and technological direction . 📍 Hybrid – remote work + 2 days per week from the office 📍 Offices: Poznań / Kraków , with additional locations planned this year 🚀 The Role We are looking for an Engineering Team Leader (.NET/C#) — someone with a strong software development background who wants to focus primarily on people management , team development, and ensuring high-quality software delivery. This is not a pure Tech Lead role — while technical competence is important, leadership and soft skills are key . 🔧 Your Responsibilities Managing a development team (building, leading, mentoring), End-to-end responsibility for product/project development in cooperation with the Product Manager, Ensuring high software engineering standards (SOLID principles, best practices), Conducting code reviews, Partial hands-on work in the codebase, Close collaboration with QA, Product, DevOps/Infrastructure, Support, and Customer Success teams, Supporting the team in solving technical challenges, Co-creating and maintaining technical and project documentation, Participating in technical recruitment processes (e.g. live coding, code reviews). 🧠 Requirements Minimum 2 years of experience leading a development team (at least 3 people), Minimum 5 years of commercial experience with .NET / C# , Strong knowledge of OOP principles, SOLID, and design patterns, Experience working with SQL databases (NoSQL is a plus), Knowledge of Git, Jira, Docker , Good knowledge of Windows and Linux environments, Polish and English — communicative level (B2) , A people-oriented mindset with a focus on mentoring, motivation, and team growth. ⭐ Nice to Have Kubernetes, VMware, Hyper-V, S3 Storage, SignalR, TeamCity, Experience with desktop applications, Low-level programming experience. 🎁 Benefits Private medical care, Sports card (e.g. Multisport), Training and development budget, English lessons during working hours, Additional days off (health prevention day, menstrual leave), Employee referral program, integrations, company events, Real influence on the product and organizational growth. 📌We will contact only selected candidates who meet the requirements specified in the job posting. The recruitment process is conducted by TQLO Sp. z o.o. , an IT recruitment agency. KRAZ registration number: 33580

🏢 Summary: Development of scalable, cloud-native applications using C#/.NET in a microservices architecture on Microsoft Azure. The role focuses on building high-performance, containerized systems, ensuring quality through CI/CD practices, and optimizing performance in modern cloud environments. Position requires strong engineering expertise and experience in travel-related solutions. 🗂️ Requirements: 5+ years experience with C# and .NET, 3+ years experience developing travel-related solutions, Experience with modern cloud architectures, Expertise in Microsoft Azure, Experience with containerized applications, Experience with SQL and NoSQL databases, Strong knowledge of microservices architecture, Understanding of API design principles, Knowledge of clean architecture and SOLID principles, Experience with CI/CD practices 📃 Skills: C#, .NET, Azure, SQL, NoSQL, Microservices, Containers, APIs, CI/CD, SOLID 🏢 Description: Our Client is a rapidly growing European technology company developing advanced digital solutions used by thousands of customers worldwide. The organization focuses on building scalable platforms and innovative products that support operational efficiency and business growth. Their engineering teams work in modern cloud environments and emphasize quality, user experience, and continuous delivery. The company operates internationally and continuously invests in product development and technology excellence. 📍 Location: Warsaw - once per week in the office 🚀 Your responsibilities Develop clean, scalable code using C# / .NET in microservices architecture and cloud-native environments Test and deploy systems and applications on Microsoft Azure Monitor and optimize system performance , identifying and resolving issues proactively Act as a technical expert for the system and support other internal teams Work in an Agile squad , with strong focus on user experience, quality assurance, and CI/CD practices Contribute to the engineering culture by sharing knowledge and applying best practices Work on projects that directly impact the company’s growth and product development 🎯 Our requirements 5+ years of professional experience in software development using C# / .NET and modern cloud architectures 3+ years of experience developing travel-related solutions Strong understanding of core software engineering principles and API design Proven expertise in building and managing high-performance containerized applications on Microsoft Azure Experience designing and managing SQL and NoSQL databases Deep understanding of microservices architecture, clean code, clean architecture, and SOLID principles Professional English proficiency ⭐ Nice to have Working knowledge of Angular / AngularJS Familiarity with AI tools supporting development workflows Experience working in Agile / Scrum environments Thank you for all applications. We will contact selected candidates. TQLO Sp. z o.o. – Employment Agency (KRAZ 33580)

🏢 Summary: Lead .NET Engineer role combining hands-on backend development with technical leadership, owning architecture, core platform services, APIs, and payment integrations in a distributed AWS environment. The position includes defining technical direction, mentoring engineers, driving CI/CD and operational excellence, and promoting AI-assisted development practices. After a short onboarding period in the US, the role is fully remote with long-term engagement in a strategic product initiative. 🗂️ Requirements: 6–10+ years of experience building and operating production software systems, Experience in Technical Lead or Lead Engineer role, Strong backend development experience with C# and .NET, Experience designing and operating distributed systems and microservices, Strong SQL and database design skills, Hands-on experience with AWS (SQS, DynamoDB, S3, ECS, Lambda), Experience owning and improving CI/CD pipelines, Experience in payments, financial services, or regulated environments, Working knowledge of React or Vue 📃 Skills: C#, .NET, AWS, ECS, Lambda, SQS, DynamoDB, S3, SQL, Microservices, REST, CI/CD, React, Vue, AI 🏢 Description: Lead .NET Engineer Remote 140–160 PLN/h B2B Full-time (FTE) *Project starts with a 2–3 week onboarding and training period in the US, followed by fully remote work. About the role We are looking for an experienced Lead .NET Engineer to take ownership of a squad responsible for core platform services, APIs, and payment integrations. In this role, you will combine hands-on software engineering with technical leadership. You will define technical direction, partner with Product on roadmap delivery, mentor engineers, and help drive the adoption of AI-assisted development practices across the software delivery lifecycle. Responsibilities Own squad-level architecture and technical decision-making. Lead the design, development, and operation of backend services and APIs. Ensure high standards of code quality, performance, security, and reliability. Drive incident management and operational excellence. Collaborate closely with Product Managers and stakeholders to deliver roadmap priorities. Mentor engineers through coaching, technical guidance, and regular feedback. Participate in hiring and team growth activities. Promote and implement AI-assisted development tools and best practices. Contribute to continuous improvement of engineering processes, CI/CD, and platform capabilities. Must-have requirements 6–10+ years of experience building and operating production software systems. Proven experience in a Technical Lead, Lead Engineer, or similar leadership role. Strong backend development experience with C#/.NET. Working knowledge of frontend technologies such as React or Vue. Experience designing and operating distributed systems and microservice architectures. Strong SQL and database design skills. Experience working within payments, financial services, or other regulated environments. Hands-on experience with AWS services, including: SQS DynamoDB S3 ECS Lambda Experience owning and improving CI/CD pipelines. Strong communication and stakeholder management skills. Nice to have Experience building large-scale payment platforms or fintech products. Previous people-management responsibilities. Experience with platform modernization and cloud transformation initiatives. Experience implementing AI-powered engineering tools and workflows. Tech Stack C# .NET AWS ECS Lambda SQS DynamoDB S3 SQL Microservices REST APIs CI/CD React / Vue AI-assisted Development What we offer Long-term engagement in a strategic product initiative. High-impact technical leadership role. Opportunity to shape engineering standards and architecture. Exposure to modern AI-assisted development practices. International environment and collaboration with US-based teams. Fully remote work after onboarding period in the US.

🏢 Summary: Hands-on Technical Lead (.NET) role focused on designing and delivering scalable, high-performance software solutions for logistics platforms. The position combines architectural decision-making, microservices and cloud-based system design with active coding and team leadership. You will drive technical direction, ensure best engineering practices, and oversee Azure-based cloud environments and CI/CD processes. 🗂️ Requirements: 8+ years of software engineering experience, Minimum 2 years in technical leadership role, Strong experience with .NET and C#, Experience designing and developing scalable RESTful APIs, Knowledge of microservices architecture and design patterns, Experience with message queues, Experience with relational or NoSQL databases, Experience with Azure and GCP cloud services, Experience with Docker and Kubernetes, Experience with CI/CD practices, Experience with Agile methodologies, Experience managing software releases and performance monitoring, Advanced English proficiency (B2+) 📃 Skills: .NET, C#, Node.js, REST, Microservices, RabbitMQ, Kafka, MySQL, MongoDB, CosmosDB, Azure, GCP, Docker, Kubernetes, CI/CD, Agile 🏢 Description: As Technical Lead (.NET) you join a team of talented engineers and developers working together to transform final mile logistics and supply chain operations.  Your role will be a hands-on leadership position where you guide engineering teams to deliver scalable, high-quality software solutions. This is the perfect role for experienced engineers who thrive in technical decision-making, architecture, and mentorship—while staying engaged in hands-on coding. Key Responsibilities: Define the technical direction, making pivotal design decisions to ensure our architecture is scalable, maintainable, and high performing. Stay hands-on with coding, leading by example and ensuring adherence to best practices in security, performance, development, deployment and observability. Implement scalable microservices, API gateways, and event-driven architectures, ensuring high availability, disaster recovery and fault tolerance strategies are in place. Champion high-quality code testing, automation testing, and continuous integration/continuous deployment (CI/CD). Oversee Azure-based cloud architecture, optimizing performance, security, and cost efficiency. Directly supervise, mentor, and develop a team of 5-7 engineers, providing career guidance and fostering a culture of engineering excellence full of collaboration, accountability and professional growth. Actively recruit and interview top talent to strengthen the engineering team. Collaborate with Product Managers to align roadmap priorities, streamline development workflows, and enhance team processes for improved efficiency and operational excellence. Optimize development workflows and SDLC processes to improve team velocity, efficiency and maintain low cycle times. Establish engineering KPIs and leverage data-driven insights to enhance performance. Stay updated with industry trends and emerging technologies to continuously improve our platform. Requirements: 8+ years in software engineering (ideally .NET C#), with at least 2 years in a technical leadership role. Experience in other tech stacks like Node.js as a plus. Demonstrated expertise in designing and developing scalable APIs, with knowledge of RESTful principles and best practices. Knowledge of microservices architecture and related design patterns / best practices. Experience with message queues (e.g., RabbitMQ, Kafka) and event-driven architecture / patterns. Experience with databases such as MySQL, MongoDB, CosmosDB or similar. Experience utilizing cloud services (Azure and GCP) and containerization (Docker, Kubernetes). Experience with Agile methodologies and CI/CD practices. Experience in managing software releases, performance monitoring, and reliability improvements. Strong problem-solving skills and ability to work in a fast-paced environment. Ability to explain complex technical concepts to engineers, executives, and cross-functional teams. Advanced proficiency in English, both written and spoken (B2+). Office location: Kraków, Poland Work Style: hybrid (2-3 days from the office / week preferred) Salary levels: 28 000 – 32 000 PLN/ month Take the next step in your career and become a part of OneRail’s exciting journey!

🏢 Summary: Remote Software Development Manager / Tech Lead role focused on leading engineering teams and defining technical strategy. The position combines hands-on expertise in .NET and cloud solutions with responsibility for architecture, code quality, and mentoring. You will collaborate with stakeholders while supporting international projects. 🗂️ Requirements: Experience as Software Development Manager or Tech Lead, Strong expertise in .NET, Experience with cloud solutions, Ability to design software architecture, Experience ensuring code quality, Experience mentoring developers, Ability to define technical strategy 📃 Skills: .NET, C#, Cloud, Azure, AWS, Architecture 🏢 Description: We are seeking an experienced Software Development Manager / Tech Lead to play a pivotal role in leading and growing our engineering teams. The ideal candidate will combine deep technological expertise—especially in .NET and cloud solutions—with strong leadership and communication skills. You will be responsible for technical strategy, architecture, code quality, and mentoring, while collaborating with business stakeholders and supporting international projects. 100% remote Rate: Up to 180PLN/h (B2B)

🏢 Summary: Mid-Level Fullstack .NET Developer role focused on building and maintaining scalable web applications within a microservices architecture. The position involves developing robust REST APIs, implementing automated testing, and contributing to CI/CD processes in a hybrid work model. You will work with modern .NET and Angular technologies to deliver high-quality, enterprise-grade systems. 🗂️ Requirements: Minimum 3 years of full stack development experience, Strong knowledge of C# and .NET Core, Practical experience with Angular, Experience with REST API development, Experience with microservice architecture, Experience with automated testing (unit, E2E), Knowledge of SOLID principles and design patterns, Experience with Docker and Kubernetes, Experience with MSSQL and PostgreSQL, Experience with CI/CD pipelines and related tools, Familiarity with JIRA, TeamCity, Jenkins, git, Communicative Polish, Legal right to work in the EU 📃 Skills: C#, .NET, Angular, REST, Microservices, Docker, Kubernetes, MSSQL, PostgreSQL, Git, Jenkins, TeamCity, JIRA, CI/CD, SOLID 🏢 Description: Ignite the Future of Digital Innovation — Shape Powerful, Scalable Systems with Cutting-Edge Technologies! Warszawa-based opportunity with hybrid work model (up to 4 days remote per week). As a Mid-Level Fullstack .NET Developer , you will be working for our client, a forward-thinking leader in the software industry dedicated to delivering innovative solutions. Your expertise will contribute to designing and implementing robust, microservice-based systems, empowering businesses to thrive in a digital landscape. Join us and be part of a dynamic environment where your skills fuel impactful projects and career growth. Your main responsibilities: Develop and maintain scalable web applications using .NET Core, C#, and Angular. Write automated unit and E2E tests to ensure high-quality deliverables. Apply SOLID principles, design patterns, IoC, and DI to create maintainable code. Design and implement REST APIs within microservice architecture. Collaborate with cross-functional teams utilizing JIRA, TeamCity, Jenkins, and version control systems like git/bitbucket. Support and optimize database interactions with MSSQL and PostgreSQL. Participate in continuous integration and delivery processes (SSDLC, CI/CD tools). You're ideal for this role if you have: Minimum of 3 years of professional experience in full stack development. Practical knowledge of C#, .NET Core, Angular. Experience with Docker and Kubernetes. Experience with automated testing, SOLID, design patterns, and REST API development. Familiarity with MS SQL, PostgreSQL, and microservice architecture. Knowledge of SSDLC, CI/CD pipelines, and tools such as JIRA, TeamCity, Jenkins, and git. It is a strong plus if you have: (optional) Certifications in cloud technologies or microservice architectures. Language Required for the role: Polish (Communicative level) 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 in English or Polish, along with a statement confirming your consent to the processing and storage of your personal data.

🏢 Summary: Engineering Leader role owning a key B2B SaaS product domain with significant business impact. Responsible for setting technical direction, shaping product vision with Product Leadership, and leading a large cross-functional team. Focused on scalable architecture, operational excellence, and high-quality delivery in a modern web and cloud environment. 🗂️ Requirements: 8+ years of software engineering experience, Proven experience building complex B2B SaaS enterprise solutions, Experience leading and managing large engineering teams, Strong knowledge of modern web development, Hands-on experience with cloud platforms, Experience contributing to architectural decisions and scalable systems, Experience working in a Product + Tech partnership model 📃 Skills: NETCore, React, Azure, SaaS, B2B, Web, Cloud, Architecture, Scalability 🏢 Description: We are looking for an experienced Engineering Leader to take ownership of a key product domain with significant business impact. In this role, you will work closely with Product Leadership, jointly shaping the product vision, roadmap, delivery, and overall business success. You will lead a large, cross-functional team (approx. 20 engineers and specialists), setting the technical direction for a core part of the customer experience. This role requires a leader who combines strong technical expertise in B2B SaaS with a product-oriented mindset. Key responsibilities: Collaborate with Product Leadership to define the product vision and roadmap, aligning technical possibilities with business objectives Lead, mentor, and grow a cross-functional team, fostering a culture of ownership, quality, and continuous improvement Drive operational excellence at scale by improving team efficiency and removing blockers in complex initiatives Provide technical leadership and actively contribute to architectural decisions, ensuring scalability and maintainability of solutions Work closely with engineering, product, and design teams to ensure alignment on priorities and delivery Oversee product quality and performance, while managing technical debt alongside new feature development Maintain visibility over team capabilities and support the growth of senior talent Requirements: Proven track record in building complex B2B SaaS enterprise solutions 8+ years of experience in software engineering, including leadership experience (managing larger teams is a strong plus) Strong understanding of modern web development and cloud platforms (experience with .NET Core, React, and Azure is a plus) Product mindset and experience working in a Product + Tech partnership model Experience delivering impactful solutions, not just maintaining legacy systems Excellent communication skills in English and Polish (C1/C2) Self-driven, proactive, and collaborative Experience working in international, fast-paced, and multicultural environments Additional information: Candidates must be eligible to live and work in Poland Location: Hybrid (Warsaw – approx. 4 days/month in the office) or fully remote within Poland What we offer: Opportunities for personal and professional development A dynamic, innovative work environment based on strong values Training and development budget Private healthcare Co-financed sports card Option to work fully remotely or in a hybrid model with an office in Warsaw

🏢 Summary: Leadership role responsible for owning and scaling a key B2B SaaS product domain with significant business impact. The position combines technical direction, architectural oversight, and close collaboration with Product to shape vision, roadmap, and delivery. You will lead a large cross-functional team and ensure scalable, high-quality solutions in a modern cloud environment. 🗂️ Requirements: 8+ years of software engineering experience, Proven experience building complex B2B SaaS enterprise solutions, Experience leading and managing large engineering teams, Strong knowledge of modern web development, Experience with cloud platforms, Hands-on experience with architectural design and scalability, Experience in Product + Tech partnership model, Fluency in English and Polish (C1/C2), Eligibility to work in Poland 📃 Skills: .NET, React, Azure, SaaS, B2B, Cloud, Web, Architecture, C# 🏢 Description: We are looking for an experienced Engineering Leader to take ownership of a key product domain with significant business impact. In this role, you will work closely with Product Leadership, jointly shaping the product vision, roadmap, delivery, and overall business success. You will lead a large, cross-functional team (approx. 20 engineers and specialists), setting the technical direction for a core part of the customer experience. This role requires a leader who combines strong technical expertise in B2B SaaS with a product-oriented mindset. Key responsibilities: Collaborate with Product Leadership to define the product vision and roadmap, aligning technical possibilities with business objectives Lead, mentor, and grow a cross-functional team, fostering a culture of ownership, quality, and continuous improvement Drive operational excellence at scale by improving team efficiency and removing blockers in complex initiatives Provide technical leadership and actively contribute to architectural decisions, ensuring scalability and maintainability of solutions Work closely with engineering, product, and design teams to ensure alignment on priorities and delivery Oversee product quality and performance, while managing technical debt alongside new feature development Maintain visibility over team capabilities and support the growth of senior talent Requirements: Proven track record in building complex B2B SaaS enterprise solutions 8+ years of experience in software engineering, including leadership experience (managing larger teams is a strong plus) Strong understanding of modern web development and cloud platforms (experience with .NET Core, React, and Azure is a plus) Product mindset and experience working in a Product + Tech partnership model Experience delivering impactful solutions, not just maintaining legacy systems Excellent communication skills in English and Polish (C1/C2) Self-driven, proactive, and collaborative Experience working in international, fast-paced, and multicultural environments Additional information: Candidates must be eligible to live and work in Poland Location: Hybrid (Warsaw – approx. 4 days/month in the office) or fully remote within Poland What we offer: Opportunities for personal and professional development A dynamic, innovative work environment based on strong values Training and development budget Private healthcare Co-financed sports card Option to work fully remotely or in a hybrid model with an office in Warsaw

🏢 Summary: 100% remote B2B opportunity to lead a development team in building and maintaining scalable applications within an agile environment. The role combines hands-on full-stack development with strategic technical leadership, focusing on robust system architecture and faster delivery of new solutions. Long-term cooperation with a two-stage recruitment process including a technical test. 🗂️ Requirements: Proficiency in .NET, Proficiency in C#, Experience in full-stack development, Experience with front-end technologies, Experience with document-based databases, Knowledge of event-based messaging frameworks, Experience with cloud services, Experience with containerization, Ability to lead development teams, Experience working in agile environment 📃 Skills: .NET, C#, Angular, MongoDB, Cloud, Docker, Microservices, REST, Git 🏢 Description: Work model: 100% remote Start date: Flexible Rate: up to 215 PLN/h netto + VAT Contract : B2B, long-term cooperation (12-month contract up front + extensions) Recruitment process : 2 stages, including a technical test estimated to take 2-4 hours. Summary: The role focuses on leading the development team to create new solutions and maintain systems within an agile environment, emphasizing the importance of robust applications and strategic direction. Main Responsibilities: Lead the development team in creating and maintaining applications. Adopt wider technology practices and address the speed of new application delivery. Engage in hands-on development while guiding the strategic direction of projects. Collaborate with teams to gather specifications and perform technical analysis. Navigate complex systems and ensure they are built to scale. Manage developer quality and capacity amidst organizational constraints. Key Requirements: Proficient in .NET and C#. Experience with full-stack development, including front-end technologies. Familiarity with document-based databases. Knowledge of event-based messaging frameworks. Experience with cloud services and containerization. Nice to Have: Prior experience in the banking or financial services sector. Familiarity with Angular or other modern front-end frameworks. Experience with MongoDB or similar environments. Other Details: Environment: .NET, C#, Angular, MongoDB, moving towards cloud solutions. Team Structure: Full Stack Developers working closely with Business Analysts.

🏢 Summary: B2B contract for a Mid/Senior FullStack Engineer to modernize and migrate legacy .NET applications to a modular, cloud-native Azure architecture in the banking sector. The role combines backend development in .NET with frontend work in React, focusing on refactoring legacy systems, building scalable APIs, and implementing CI/CD and observability practices. Hybrid work model with strong influence on architectural decisions and cloud migration. 🗂️ Requirements: 5+ years of commercial experience with C# and .NET (Framework and .NET Core/6+), Strong proficiency in EF Core and MSSQL (query tuning, transactions, indexing), Commercial experience with React and TypeScript, Experience building and securing REST APIs (authentication, versioning, validation), Familiarity with Azure services (App Service, Functions, SQL, Service Bus, Storage), Experience with automated testing (unit, integration, contract, E2E), Experience with CI/CD pipelines (Azure DevOps or GitHub Actions), Ability to work with legacy .NET codebases (ASP.NET MVC, Razor, WPF, WinForms), English at B2+ level 📃 Skills: C#, .NET, .NETCore, .NET6, .NET8, EFCore, MSSQL, T-SQL, React, TypeScript, REST, Azure, AppService, AzureFunctions, AzureSQL, ServiceBus, AzureStorage, xUnit, Jest, Playwright, Cypress, Git, AzureDevOps, GitHubActions, ASP.NET, MVC, Razor, WPF, WinForms, DDD, CleanArchitecture 🏢 Description: We are looking for FullStack Engineer (.NET & React) Location: Kraków / Hybrid (7 days in the office per month) Contract Type: B2B Contract Seniority: Mid / Senior About the Project Join a high-impact modernization initiative for a leading player in the banking sector . We are transforming a portfolio of approximately a dozen .NET applications and MSSQL databases into a modular, cloud-native Azure architecture. As a FullStack Engineer, you will play a dual role: evolving existing production services (including legacy UI and desktop components) while systematically extracting business logic to re-implement it into a modern, scalable ecosystem. This is a unique opportunity to influence the transition from monolithic architectures to high-performance, distributed cloud services. Your Responsibilities Design & Development: Build backend services and APIs using .NET 6/8 following Clean Architecture and DDD patterns. Frontend Evolution: Develop and maintain React + TypeScript frontends, managing the incremental migration from legacy UI modules. Modernization: Read, refactor, and extract complex business logic from legacy .NET codebases and T-SQL stored procedures. Quality Assurance: Write and maintain comprehensive automated tests (Unit, Integration, Contract, and E2E). DevOps & Observability: Create CI/CD pipelines (Azure DevOps/GitHub Actions) and instrument services for deep observability (metrics, logs, distributed traces). Collaboration: Participate in domain modeling, architecture discussions, and Agile ceremonies with Architects and Product Owners. Skills & Experience We Require Experience: 5+ years of commercial experience with C# and the .NET ecosystem (both Framework and .NET Core/6+). Database Expertise: Strong proficiency in EF Core and MSSQL (including query tuning, transactions, and indexing). Frontend: Solid production experience with React and TypeScript. Web Services: Practical experience in building and securing REST APIs (Auth, Versioning, Validation). Cloud: Familiarity with Azure services (App Service, Functions, SQL, Service Bus, Storage). Testing & Tooling: Experience with xUnit, Jest, and Playwright/Cypress, as well as disciplined Git practices. Legacy Handling: The ability to read and reason about legacy codebases (ASP.NET MVC, Razor, WPF, or WinForms). Communication: English at a B2+ level for technical documentation and team collaboration. Nice to Have Experience with Infrastructure as Code (Terraform or Bicep). Knowledge of Docker and Kubernetes (AKS). Background in migrating monoliths to microservices. Azure Developer Associate certification. What We Offer Impact: Real influence on the architecture and the cloud migration roadmap. Autonomy: Direct collaboration with Tech Leads and Architects in a flat structure. Modern Stack: Opportunity to work with the latest .NET versions (6/8) and React. Efficiency: Fast technical onboarding with immediate access to repos, CI/CD pipelines, and monitoring tools. Flexible Hybrid Model: Remote-first approach with only 7 planned days in the Kraków office per month. Benefits : Luxmed and Multisport Card