Senior C# Developer

🏢 Summary: Backend Python Developer role within a structured rates products team, building and maintaining analytics microservices for pricing and valuation of financial instruments in a banking environment. The position involves developing backend features, integrating with frontend components, and deploying services on Kubernetes in a microservices architecture. The role supports trading systems used for initial valuation of financial products. 🗂️ Requirements: Excellent knowledge of Python with type hinting, Experience working with large codebases, Proficiency with Git version control, Knowledge of Docker, Knowledge of Kubernetes, Knowledge of Ansible, Experience with unit testing, Knowledge of JavaScript, Knowledge of React, Experience leveraging AI agents for software development 📃 Skills: Python, TypeHinting, Git, Docker, Kubernetes, Ansible, JavaScript, React, Testing, AI, Microservices 🏢 Description: Montrose Software supports one of the largest North American banks in enhancing and maintaining its financial libraries and applications. The bank serves over 17 million clients worldwide, employs more than 86,000 people, and offers a broad range of services including personal and commercial banking, wealth management, insurance, investor services, and capital markets products. Within this engagement, we are part of the structured rates products team, responsible for developing analytics services that support the pricing and initial valuation of financial instruments used across the bank’s systems and web-based applications. The solution is built using a microservices architecture, with communication handled via the Solace messaging system (pub/sub architecture). All microservices are deployed on the bank’s own Kubernetes cluster and are used by traders for the initial valuation of financial products before they are traded. Industry : Finance Location : Kraków / Hybrid/ Remote from Poland Your daily work will include: Develop and maintain backend functionality and integrate it with the frontend. Implement new features, optimize existing functionality, and fix bugs. Work together with other developers to deliver high-quality results Team & Collaboration > 20 people, and 7 from Montrose Regular meetings: Daily at 15:30 CET and weekly retrospective Communication : Chat, emails, ad hoc call Working hours: usually 9:00–17:00 CET Qualifications: Excellent knowledge of Python programming language with type hinting Large codebases, with hands on experience Ability to use Git version control system Docker / Kubernetes / ansible knowledge Unit testing skills Knowledge of Javascript / React Experience leveraging AI agents for software development Fluent in spoken and written English Nice to have: Familiarity with C++ Experience in a quantitative finance environment Experience in Linux/Windows management Please note that the interview process is divided into four parts: Technical phone screening (~30 minutes) Technical interview (~2 hours) Non-technical call with HR team (~30 minutes) Call with client for which you will be working Perks, Snacks & Everything Nice :) Work Environment & Flexibility Top-quality equipment to support your work Flexible working hours Remote work option Exciting and challenging projects with international teams Learning & Development English lessons with a native speaker Dedicated training budget for personal and professional growth Health & Well-being Private medical insurance Multisport card Air-conditioned workspace Showers available at the office Food & Comfort Lunches from Kraków’s top restaurants delivered to the office or a refund of the budget allocated for it Fully stocked kitchen with drinks, fruit, and snacks Lifestyle & Fun No dress code — dress comfortably Chillout area with bean bags, therapy balls, PlayStation 4, Nintendo Switch 2 + games, stretching area, and pull-up bar Regular team events Additional Perks Indoor bicycle parking Wyrażam zgodę na przetwarzanie moich danych osobowych przez Montrose Software zgodnie z Polityką Prywatności . English Version: I consent to Montrose Software processing my personal data according to the Privacy Policy Zapoznałem sie z Polityka Ochrony Sygnalistów Montrose Software. English Version: I consent to the Montrose Software Whistleblower Protection Policy.

🏢 Summary: The offer is for a backend engineer role focused on building and optimizing distributed infrastructure services for large-scale pricing and risk calculations in the financial domain. The position involves developing and maintaining C++ and Python services, supporting high-throughput and low-latency analytics, and ensuring reliability in a complex distributed system. The role includes working with containerized environments on Linux and Kubernetes, using modern CI/CD and messaging solutions. 🗂️ Requirements: Good knowledge of C++, Experience working in Linux environment, Proficiency in Python, Experience with Git, Familiarity with RESTful applications, Familiarity with containerization technologies, Familiarity with Kubernetes 📃 Skills: C++, Python, Linux, Kubernetes, Docker, Git, REST, SQL, SQLServer, Solace, Jenkins, GitHub, Jira 🏢 Description: Project description: Our team develops and evolves infrastructure services that orchestrate large-scale analytic price and risk computations across a wide range of financial instruments. These calculations are distributed over thousands of computation engines, enabling both high-throughput End-of-Day batch processing and low-latency intraday streaming analytics. The core analytic engine is implemented in C++, while the surrounding orchestration services are written in Java (legacy) and Python. We’re transitioning our environment from Windows-based virtual machines to containerized deployments on Kubernetes and Linux. Communication between services is primarily handled via Solace messaging and REST APIs. A major focus of our work is ensuring reliability and performance in a complex distributed system- including extensive debugging, monitoring, and log analysis to identify and resolve issues across multiple services and environments. Industry : Finance Location : Kraków / Hybrid/ Remote from Poland Your daily work will include: Building and optimizing services for pricing and risk calculation Designing, developing, and maintaining backend services in C++ and Python Participating in code reviews, discussing technical improvements, and sharing best practices Collaborating with developers across Poland, UK and Canada Working with SQL Server, Linux, and Solace (Pub/Sub model) Using GitHub, Jira, and Jenkins for CI/CD and task management Team & Collaboration 3 (Montrose) + 3 on the client’s side, including developers (4) and QAs (2) Regular meetings: daily standups biweekly sprint planning biweekly retrospective biweekly developer catchup call 4 short biweekly backlog refinement sessions Communication via email and Webex chat Working hours: usually 9:30–17:30 CET Qualifications: Good knowledge of C++ Linux environment Python Git Familiar with RESTful applications Familiar with containerization and Kubernetes Nice to have: Fintech experience Strong software engineering or math background Microsoft SQL use AI agents for development( ( e.g. Microsoft Copilot) Please note that the interview process is divided into four parts: Technical phone screening (~30 minutes) Technical interview (~2 hours) Non-technical call with HR team (~30 minutes) Call with client for which you will be working Perks, Snacks & Everything Nice :) Work Environment & Flexibility Top-quality equipment to support your work Flexible working hours Remote work option Exciting and challenging projects with international teams Learning & Development English lessons with a native speaker Dedicated training budget for personal and professional growth Health & Well-being Private medical insurance Multisport card Air-conditioned workspace Showers available at the office Food & Comfort Lunches from Kraków’s top restaurants delivered to the office or a refund of the budget allocated for it Fully stocked kitchen with drinks, fruit, and snacks Lifestyle & Fun No dress code — dress comfortably Chillout area with bean bags, therapy balls, PlayStation 4, Nintendo Switch 2 + games, stretching area, and pull-up bar Regular team events Additional Perks Indoor bicycle parking Wyrażam zgodę na przetwarzanie moich danych osobowych przez Montrose Software zgodnie z Polityką Prywatności . English Version: I consent to Montrose Software processing my personal data according to the Privacy Policy Zapoznałem sie z Polityka Ochrony Sygnalistów Montrose Software. English Version: I consent to the Montrose Software Whistleblower Protection Policy.

🏢 Summary: Internship offer for IT students to work on internal web and mobile projects, gaining hands-on experience under senior developer mentorship while supporting technical office tasks and website updates. 🗂️ Requirements: Student of Information Technology or related field (minimum 2nd year), Knowledge of at least one programming language, Understanding of algorithms and data structures, Very good spoken and written English, Analytical thinking skills, Willingness to learn new technologies 📃 Skills: English, Programming, Algorithms, DataStructures, Web, Mobile 🏢 Description: Montrose Software is a software consultancy based in New Jersey USA, with our primary development center in Kraków. We develop mobile apps, web applications and enterprise systems for a wide variety of clients. We are always looking for excellent programmers at all levels of experience, from students and recent graduates to professionals looking for a change. If you want to work on dynamic projects for world class clients in a fun workplace, do not hesitate to apply. Requirements: Very good in spoken and written English, You are a student of Information Technology, or similar faculty (at least 2nd year of studies), Knowledge of at least one programmatic language, Knowledge of fundamental algorithms and data structures, You would like to learn new skills/technologies, Analytical thinking. Responsibilities: Developing internal projects (~70% of the time) Developing Montrose internal project, There are several different projects using different technology stacks, mostly web or mobile Interns will be cared for by senior developers (e.g. code review, consultations) Technical assistance for the office manager (~20% of the time) Various tasks that need some technical knowledge, like preparing computers for new employees, comparing pieces of equipment that we want to buy (e.g. screens) etc Montrosesoftware.com updates (~10% of the time) Updates to our company website We’re not planning any major redesign now, rather small changes (like adding a new job offer) Perks, Snacks & Everything Nice :) Work Environment & Flexibility Top-quality equipment to support your work Flexible working hours Exciting and challenging projects with international teams Learning & Development English lessons with a native speaker Dedicated training budget for personal and professional growth Health & Well-being Private medical insurance Multisport card Air-conditioned workspace Showers available at the office Food & Comfort Lunches from Kraków’s top restaurants delivered to the office or a refund of the budget allocated for it Fully stocked kitchen with drinks, fruit, and snacks Lifestyle & Fun No dress code — dress comfortably Chillout area with bean bags, therapy balls, PlayStation 4, Nintendo Switch 2 + games, stretching area, and pull-up bar Regular team events Additional Perks Indoor bicycle parking Wyrażam zgodę na przetwarzanie moich danych osobowych przez Montrose Software zgodnie z Polityką Prywatności . English Version: I consent to Montrose Software processing my personal data according to the Privacy Policy Zapoznałem sie z Polityka Ochrony Sygnalistów Montrose Software. English Version: I consent to the Montrose Software Whistleblower Protection Policy.

🏢 Summary: Backend Developer role focused on building and maintaining analytics services for pricing and valuation of financial instruments within a microservices architecture. The position involves developing backend features, integrating with frontend components, and supporting event-driven systems used by traders in a banking environment. Work includes optimizing existing solutions and collaborating within a large, distributed team. 🗂️ Requirements: Excellent knowledge of Python, Experience with FastAPI framework, Knowledge of event-driven architecture, Understanding of programming design patterns, Experience working with large codebases, Proficiency with Git version control, Unit testing skills, Knowledge of JavaScript, Knowledge of React, Understanding of software architecture and design principles 📃 Skills: Python, FastAPI, JavaScript, React, Git, Microservices, Testing, Architecture, Design-patterns, Event-driven 🏢 Description: Montrose Software supports one of the largest North American banks in enhancing and maintaining its financial libraries and applications. The bank serves over 17 million clients worldwide, employs more than 86,000 people, and offers a broad range of services including personal and commercial banking, wealth management, insurance, investor services, and capital markets products. Within this engagement, we are part of the structured rates products team, responsible for developing analytics services that support the pricing and initial valuation of financial instruments used across the bank’s systems and web-based applications. The solution is built using a microservices architecture, with communication handled via the Solace messaging system (pub/sub architecture). All microservices are deployed on the bank’s own Kubernetes cluster and are used by traders for the initial valuation of financial products before they are traded. Industry : Finance Location : Kraków / Hybrid/ Remote from Poland Your daily work will include: Develop and maintain backend functionality and integrate it with the frontend. Implement new features, optimize existing functionality, and fix bugs. Work together with other developers to deliver high-quality results Team & Collaboration > 20 people, and 7 from Montrose Regular meetings: Daily at 15:30 CET and weekly retrospective Communication : Chat, emails, ad hoc call Working hours: usually 9:00–17:00 CET Qualifications: Excellent knowledge of Python Knowledge of event-driven architecture Python FastAPI framework Good understanding of programming design pattern Large codebases, with hands on experience Ability to use Git version control system Unit testing skills Knowledge of Javascript / React Knowledge of software architecture and design principles Fluent in spoken and written English Nice to have: Familiarity with C++ Experience in a quantitative finance environment Docker / Kubernetes / ansible knowledge Experience in Linux/Windows management Perks, Snacks & Everything Nice :) Work Environment & Flexibility Top-quality equipment to support your work Flexible working hours Remote work option Exciting and challenging projects with international teams Learning & Development English lessons with a native speaker Dedicated training budget for personal and professional growth Health & Well-being Private medical insurance Multisport card Air-conditioned workspace Showers available at the office Food & Comfort Lunches from Kraków’s top restaurants delivered to the office or a refund of the budget allocated for it Fully stocked kitchen with drinks, fruit, and snacks Lifestyle & Fun No dress code- dress comfortably Chillout area with bean bags, therapy balls, PlayStation 4, Nintendo Switch 2 + games, stretching area, and pull-up bar Regular team events Additional Perks Indoor bicycle parkingm

🏢 Summary: Senior role focused on migrating and enhancing a rates trading platform from a legacy system to Murex, implementing data transformation between Murex and FpML formats, and building a trade booking bridge. The position involves moving services to a Linux/Java/PostgreSQL stack and optimizing database performance for capital markets systems. Work includes backend development and database configuration in a finance environment. 🗂️ Requirements: 7+ years hands-on software development experience, 5+ years database experience, 2+ years PostgreSQL experience, 3+ years Java 17+ experience, Experience with Spring, Experience with SpringBoot, Experience with unit testing, 5+ years GitHub experience, Experience with database configuration and optimization, Experience with database clustering, Experience with Docker, Experience with Kubernetes 📃 Skills: PostgreSQL, Java, Spring, SpringBoot, GitHub, Docker, Kubernetes, Linux, Murex, FpML, MsSQL, .NET, Windows, Clustering, UnitTesting 🏢 Description: Montrose Software (Polska) Sp. z o.o. Montrose Software is a software consultancy based in New Jersey (USA), with our primary development center in Kraków. We develop mobile apps, web applications and enterprise systems for a wide variety of clients. If you want to work on dynamic projects for world class clients in a fun workplace, do not hesitate to apply. Senior PostgreSQL and Java Developer Our client: Montrose Software has an ongoing relationship with one of the largest North American banks to enhance and maintain its production libraries and applications. The bank serves 17 million clients worldwide and provides personal and commercial banking, wealth management, insurance, investor services, and capital markets products and services globally. We work mainly with their capital markets teams, focusing on derivatives and fixed income systems. Project description: The bank made a strategic decision to migrate the rates trading platform from a legacy system to Murex. As the new system passes data in a new format, our team is to implement and enhance the system capabilities to transform between Murex format and FpML, as well as create a new bridge that will allow booking of trades in FpML form into Murex. The system supports a wide variety of financial products, starting from simple FRAs and Swaptions to complex products. As part of this project will be to move services from Windows/.NET/MsSQL to Linux/Java/PostgreSQL platform. Industry : Finance Location : Kraków / Hybrid/ Remote from Poland Your daily work will include: PostgreSQL database configuration, optimization and schema designing Writing well tested java code Configuring and working with database cluster and others like docker, kubernetes. Team & Collaboration 3 developers and 2 managers Regular meetings: Daily Stand-Up in afternoon hours. Communication via email and Webex chat Working hours: usually 9:00–17:00 CET Qualifications: Strong technical developer with 7+ years hands on experience 5+ years of experience in Database technologies, including 2+ years with PostgreSQL 3+ years of experience in Java 17+ with Spring, Spring-Boot, unit-tests. 5+ years of experience with version control systems like GitHub

🏢 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: 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: Long-term remote B2B contract for a technical leader responsible for guiding a development team in building and maintaining scalable applications within an agile environment. The role combines hands-on .NET development with strategic oversight, technical analysis, and quality management. Focus is on delivering robust, cloud-oriented solutions and improving application delivery speed. 🗂️ Requirements: Proficiency in .NET and 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 team, Experience in building scalable systems 📃 Skills: .NET, C#, Angular, MongoDB, Cloud, Docker, Messaging, SQL 🏢 Description: Work model: 100% remote Start date: 30.06.2026 Rate: 160-180 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: Technical leadership role focused on driving the development and maintenance of scalable .NET-based applications in an agile environment. The position combines hands-on full-stack development with strategic oversight of architecture, quality, and delivery speed. It involves close collaboration with cross-functional teams to build robust, cloud-oriented solutions. 🗂️ Requirements: Proficiency in .NET and C#, Experience in full-stack development, Knowledge of front-end technologies, Experience with document-based databases, Knowledge of event-based messaging frameworks, Experience with cloud services, Experience with containerization, Ability to design scalable systems, Experience leading development teams 📃 Skills: .NET, C#, Angular, MongoDB, Cloud, Docker, Kubernetes, Microservices, REST, Git 🏢 Description: Work model: 100% remote Start date: 30.06.2026 Rate: 160-180 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: Engineering Team Leader (.NET/C#) role responsible for leading a development team and owning the design and delivery of advanced backup and disaster recovery solutions. The position combines hands-on development with architectural decisions and cross-functional collaboration in a growing R&D environment. Work involves building and maintaining distributed systems using modern Microsoft and containerized technologies. 🗂️ Requirements: Minimum 2 years experience as Team Leader (team of at least 3 engineers), Minimum 5 years commercial experience with .NET and C#, Strong knowledge of OOP, SOLID and DRY principles, Experience with SQL and NoSQL databases, Experience designing and developing REST APIs, Knowledge of Windows and Linux environments, Practical experience with Git, Jira and Docker, Experience creating unit, integration and E2E tests, Communicative Polish and English 📃 Skills: .NET, C#, REST, WebSockets, Docker, SQL, NoSQL, SQLite, PostgreSQL, VMware, Hyper-V, Git, Jira, Windows, Linux, OOP, SOLID, DRY, Kubernetes, S3, MS365, SignalR, TeamCity, Android, iOS, macOS 🏢 Description: Our Client is a leading provider of backup and disaster recovery solutions . The company develops advanced products securing physical, virtual, SaaS, and DevOps environments . Its solutions are used by Fortune 500 companies worldwide. You will join the organization as an Engineering Team Leader (.NET/C#) and have a real impact on product development and the growth of R&D teams during a period of intensive company expansion. 📍 Location: Kraków / Poznań - 2 days per week in the office 🏡 Work model: remote start, after a few months hybrid work model (office in one of the above locations) Scope of responsibilities Building, leading, and mentoring a development team (3+ engineers) Full ownership of assigned projects and products (in cooperation with the Product Manager) Designing and implementing new functionalities Developing and maintaining systems based on: .NET/C#, REST APIs, WebSockets, Docker, SQL/NoSQL (SQLite, PostgreSQL), VMware/Hyper-V Ensuring code quality and software development standards Conducting code reviews Close cooperation with QA, Product Team, DevOps/Infrastructure, Customer Success, and Support Solving complex technical problems Creating unit, integration, and E2E tests Co-creating and maintaining technical documentation Requirements Minimum 2 years of experience in a Team Leader role (team of at least 3 people) Minimum 5 years of commercial experience with .NET / C# Strong knowledge of OOP, SOLID, DRY principles, and design patterns Experience working with SQL and NoSQL databases Knowledge of Windows and Linux environments Practical experience with Git, Jira, Docker Communicative knowledge of Polish and English Nice to have Kubernetes, VMware, Hyper-V, S3, MS365, SignalR, TeamCity Experience with Android / iOS / macOS Low-level programming experience What we offer For B2B: 26 days off from service provision + 10 days of paid sick leave Full equipment and hardware provided Training budget Free English lessons during working hours Multisport card (e.g. Light package for 1 PLN) Private medical care (Luxmed package from 1 PLN) TQLO Sp. z o.o. – Recruitment Agency (KRAZ no. 33580)