Team Lead (.NET)

🏢 Summary: Long-term remote B2B opportunity for an experienced .NET Tech Lead to lead the design and delivery of scalable, secure event-driven microservices for a banking-sector client. The role combines hands-on .NET and Azure development with architectural leadership, engineering quality, and technical mentoring in a regulated environment. 🗂️ Requirements: 10+ years of modern .NET experience, 3+ years as a Tech Lead or Senior .NET Developer with technical leadership responsibilities, Banking, FinTech, or other regulated-industry delivery experience, Event-driven architecture and Kafka expertise, Azure experience, including Functions, DevOps, and Application Insights, Docker and Kubernetes experience, Redis and NoSQL database knowledge 📃 Skills: .NET, Kafka, Azure, Docker, Kubernetes, Redis, NoSQL 🏢 Description: Location: 100% Remote Contract: B2B, long-term cooperation Industry: Banking / FinTech We are looking for an experienced Tech Lead (.NET) to join a team delivering modern solutions for a client in the banking sector. You'll play a key role in designing and leading the development of scalable, event-driven systems in a highly regulated environment, while supporting the technical growth of the team and driving architectural decisions. Your responsibilities: Lead the technical direction of the development team Design and develop modern event-driven microservices Drive architecture and technology decisions Collaborate closely with architects, developers, and business stakeholders Ensure high code quality and engineering best practices Support the delivery of scalable, secure, and high-performance solutions Requirements: 10+ years of experience with modern .NET 3+ years of experience as a Tech Lead or Senior .NET Developer with technical leadership responsibilities Experience delivering solutions within banking, fintech, or other regulated industries Solid understanding of event-driven architecture and Kafka Hands-on experience with Azure , including services such as Azure Functions, Azure DevOps, and Application Insights Experience with Docker and Kubernetes in containerized environments Knowledge of Redis and NoSQL databases Strong communication skills and fluent English Nice to have: Experience designing distributed systems at scale Knowledge of cloud-native development patterns Experience working in Agile/Scrum environments

🏢 Summary: Long-term B2B remote contract for a Tech Lead (.NET) delivering scalable, secure event-driven microservices for a banking client. The role leads technical direction, architecture decisions, and engineering quality while collaborating with technical and business stakeholders. 🗂️ Requirements: 10+ years of modern .NET experience, 3+ years as a Tech Lead or Senior .NET Developer with technical leadership responsibility, Experience in banking, fintech, or another regulated industry, Event-driven architecture and Kafka knowledge, Hands-on Azure experience, Experience with Azure Functions, Azure DevOps, and Application Insights, Docker and Kubernetes experience, Redis and NoSQL database knowledge, Fluent English, Strong communication skills 📃 Skills: .NET, Kafka, Azure, Functions, DevOps, ApplicationInsights, Docker, Kubernetes, Redis, NoSQL 🏢 Description: Location: 100% Remote Contract: B2B, long-term cooperation Industry: Banking / FinTech About the role We are looking for an experienced Tech Lead (.NET) to join a team delivering modern solutions for a client in the banking sector. You'll play a key role in designing and leading the development of scalable, event-driven systems in a highly regulated environment, while supporting the technical growth of the team and driving architectural decisions. Your responsibilities Lead the technical direction of the development team Design and develop modern event-driven microservices Drive architecture and technology decisions Collaborate closely with architects, developers, and business stakeholders Ensure high code quality and engineering best practices Support the delivery of scalable, secure, and high-performance solutions Requirements 10+ years of experience with modern .NET 3+ years of experience as a Tech Lead or Senior .NET Developer with technical leadership responsibilities Experience delivering solutions within banking, fintech, or other regulated industries Solid understanding of event-driven architecture and Kafka Hands-on experience with Azure , including services such as Azure Functions, Azure DevOps, and Application Insights Experience with Docker and Kubernetes in containerized environments Knowledge of Redis and NoSQL databases Strong communication skills and fluent English Nice to have Experience designing distributed systems at scale Knowledge of cloud-native development patterns Experience working in Agile/Scrum environments

🏢 Summary: Hands-on Senior .NET Developer / Technical Lead role focused on building backend APIs for a new customer mobile app and modernizing a large operational platform. The role offers ownership of architecture, integrations, engineering standards, and future backend team development, with compensation of $5,000–$6,000 plus milestone bonuses and relocation support to Warsaw. 🗂️ Requirements: Commercial .NET / C# experience, Production backend systems and API development experience, API design, authentication, authorization, and security knowledge, SQL and database design experience, Third-party and existing business-system integration experience, Legacy application modernization experience, Cloud infrastructure, CI/CD, testing, and production support knowledge, Technical ownership and sound decision-making ability, Strong communication and practical problem-solving skills 📃 Skills: .NET, C#, API, SQL, Authentication, Authorization, Security, CI/CD, Cloud, Testing, Monitoring, Azure, Umbraco, Microservices, IoT, CRM, ERP, CMS 🏢 Description: Senior .NET Developer / Technical Lead One of the largest logistics and storage companies in the region is looking for a Senior .NET Developer / Technical Lead to help build the next generation of its technology platform. This is a hands-on role with significant ownership. You’ll work closely with the leadership and product teams, make important technical decisions, and help modernize a large operational platform used across the business. Your first project: Your immediate priority will be building the backend APIs for a new customer mobile application . Customers will use the app to manage their accounts and rentals, make payments, and access their storage units. You’ll work closely with the mobile team to design the APIs, authentication, permissions, integrations, and backend workflows that make this possible. Beyond the mobile application, you’ll help move the business away from legacy systems and towards a modern, API-driven platform connecting customer applications, operations, payments, access control, reporting, notifications, and other core services. What you’ll do Design and build production APIs and backend services using .NET / C# Work closely with the mobile team on API contracts and backend workflows Take ownership of key backend and architecture decisions Integrate new services with existing systems and SQL databases Help modernize and gradually replace legacy applications Design secure and reliable integrations between business-critical systems Improve testing, monitoring, documentation, and CI/CD practices Help establish development standards as the platform grows Mentor and potentially help build the future backend team What we’re looking for Strong commercial experience with .NET / C# Proven experience building production backend systems and APIs Strong understanding of API design, authentication, authorization, and security Good SQL and database design experience Experience integrating third-party or existing business systems Experience working with or modernizing legacy applications Understanding of cloud infrastructure, CI/CD, testing, and production support Ability to take ownership and make sound technical decisions Strong communication skills and a practical approach to solving problems Nice to have Experience in any of the following would be useful, but is not required : Azure or another major cloud platform Payments Mobile application backends Access-control, IoT, or hardware-connected systems CRM, ERP, CMS, or operational platforms Umbraco Microservices or event-driven systems Leading or mentoring other developers Why join? This isn’t a maintenance role. You’ll have the opportunity to influence the architecture of a major new platform, replace legacy technology with modern systems, and see the software you build used directly by customers and operations. You’ll join at an important stage of the project with the opportunity to take real technical ownership and grow into a broader leadership role as the engineering team expands. Offer: $5,000 — $6,000 (depending on experience) Rewarding bonuses for milestones hit. Work in a new high-tech office in Warsaw Long-term growth opportunities and career progression Relocation support to Warsaw (If needed)

🏢 Summary: Remote B2B opportunity for a .NET Software Developer to design, build, and optimize mission-critical enterprise systems for a major European institution. The role includes end-to-end development, technical leadership, solution design, testing, release management, and advanced technical support, with occasional visits to Warsaw. 🗂️ Requirements: 4+ years of IT-relevant professional experience, 2+ years of relevant project or similar-role experience, 2+ years working with mission-critical complex enterprise systems, Experience with asset or human-resources management and financial-management systems, Expertise in enterprise-level .NET software development, Data, business-logic, and UI layer design and development experience, UML application design experience, Completion of at least one full software-solution lifecycle, Scrum development experience, Technical team leadership experience, Fluent English at B2 level or higher, Bachelor’s degree or equivalent 3 years of higher education in an ICT-relevant field, Intermediate .NET software-development certification or an accepted equivalent international certification 📃 Skills: .NET, UML, Scrum, ICT 🏢 Description: Software Developer (.NET) — own system design, lead technical teams, and drive end-to-end development. Far-site remote, 200 PLN net/h B2B. IT · Multiple locations · Fully Remote About the Client and our Role At Optiveum, we connect top IT professionals with exciting tech initiatives. In this case, we are the recruitment partner acting within the TimeDev Framework Agreement to provide outsourcing consultants for our partner organization . By taking part in this long-term project, you will be contributing as a Software Developer to support a major European institution. The Role We are looking for a Software Developer (.NET) to take an active role in designing, building, and optimizing enterprise-level software systems. In this position, you will lead development initiatives, implement robust solutions across data, business logic, and UI layers, and ensure software meets stringent security, performance, and quality standards. You will work closely with other technical teams to prototype solutions and support complex enterprise frameworks. Responsibilities Design and develop the system, translating requirements into technical design. Lead development teams and set software development standards. Design applications using UML and optimize software for performance, security, and quality. Propose technical solutions for business needs and solve complex technical problems. Estimate effort and time for development. Produce technical documentation and effectively document developments. Manage configuration, releases, and collect/interpret software metrics. Contribute to requirements analysis, testing, quality assurance, change management, and deployment. Test solutions, develop testing tools, and prototype new features. Act as 2nd and 3rd line technical support. Expectations Experience: Minimum 4 years of overall IT-relevant professional experience, including at least 2 years of project experience relevant to the profile (or in a similar position). Specific Domain Expertise: At least 2 years of experience with mission-critical complex enterprise systems, specifically including asset and/or human resources management, as well as financial management. Technology Stack: Expert in developing enterprise-level software systems in the .NET technology domain . Technical Skills: Proficient in designing and developing the data layer, business logic layer, and UI layer. Strong knowledge of UML and ability to design applications in UML. Completion of at least 1 full lifecycle of a software solution. Process & Leadership: Experience working in Scrum developments, capable of leading technical teams, and strong problem-solving skills. Language: Fluent English (minimum B2 level / CEFR). Education (Level 6): Minimum Bachelor’s degree (or 3 years of higher education confirmed by a diploma). An ICT-relevant degree is mandatory. Certifications Requirements You must possess at least one of the following: An Intermediate level certificate in software development relevant to the domain (.NET). An equivalent internationally recognized certification (subject to acceptance as a valid credential by the Contracting Authority). What We Offer Salary: max 200 net / hour. Contract Type: B2B agreement. Type of Work: Remote with occassional visits to the client HQ in Warsaw, Poland

🏢 Summary: Lead .NET Developer role for an international client, owning delivery of Azure-based applications while improving production performance, reliability, and code quality. The position includes technical leadership, mentoring, collaboration with QA, DevOps, architecture, and product stakeholders, and support for modularizing monolithic functionality. 🗂️ Requirements: 10+ years of software development experience, Strong C#, .NET, ASP.NET Core and Web API experience, Strong Entity Framework / EF Core experience, Strong Azure experience: App Services, Azure SQL, Application Insights, Azure DevOps and CI/CD, Production-system performance and reliability improvement experience, Developer leadership, code review and engineering standards experience, Strong communication with technical and non-technical stakeholders 📃 Skills: C#, .NET, ASP.NET, WebAPI, EntityFramework, EFCore, Azure, AppServices, AzureSQL, ApplicationInsights, AzureDevOps, CI/CD 🏢 Description: Zaven is a software company from Wrocław, Poland. We build high-quality custom software for essential industries. Our focus is on practical results and trusting our people, not on strict rules or long processes. If you want to work with smart teams to build important software, and you want to avoid big company bureaucracy, this is the place for you. Now we’re looking for a .NET Developer to join our team on a project for one of our international clients. We need a hands-on .NET lead developer who can own delivery, improve code quality, mentor developers, and work closely with architecture, QA, DB, DevOps, and product stakeholders. What exactly will you be doing?: Leading development work across .NET, C#, and Azure-based applications. Reviewing and improving code quality, performance, maintainability, and reliability. Working on application performance optimizations, including async/await, EF Core usage, caching, API design, memory allocation, HttpClient usage, long-running processes, and error handling. Supporting the decomposition of monolithic functionality into modular components or services. Partnering with QA teams on testability, regression coverage, defect triage, and release readiness. Mentoring mid-level developers and raising engineering standards. Collaborating with product and business stakeholders to clarify requirements and reduce rework. Participating in production issue analysis and root-cause reviews. Required Skills & Experience: 10+ years software development experience. Strong C#, .NET, ASP.NET Core, Web API experience. Strong Entity Framework / EF Core experience. Strong Azure experience: App Services, Azure SQL, Application Insights, Azure DevOps, CI/CD. Experience improving performance and reliability in production systems. Experience leading developers, reviewing code, and setting engineering standards. Strong communication skills with both technical and non-technical stakeholders. Nice to have: Angular / React / front-end experience. Redis / distributed caching. Azure Front Door, API Management, Service Bus, Storage. Insurance, fintech, or regulated environment experience. Experience with test automation and CI/CD quality gates.

🏢 Summary: Oferta B2B dla Team Leadera / Tech Leada, który poprowadzi rozwój backendu .NET platformy PSIM wspieranej przez AI Computer Vision. Rola łączy projektowanie skalowalnych systemów rozproszonych, zarządzanie zespołem oraz integrację modeli analitycznych z systemami bezpieczeństwa fizycznego. 🗂️ Requirements: Doświadczenie w prowadzeniu zespołu deweloperskiego, Minimum 5–6 lat doświadczenia komercyjnego w C# i .NET, Znajomość ASP.NET Core, REST API, EF Core i MS SQL Server, Praktyczne doświadczenie w projektowaniu systemów rozproszonych, Znajomość wzorców projektowych i optymalizacji wydajności, Gotowość do codziennej pracy stacjonarnej, Gotowość do wyjazdów wdrożeniowych 📃 Skills: C#, .NET, ASP.NET, REST, EF, SQL, SOLID, AI, ComputerVision 🏢 Description: Team Leader / Tech Lead (.NET & AI Physical Security) Miejsce pracy: Warszawa, Plac Konstytucji ( 100% stacjonarnie ) Forma zatrudnienia: B2B O projekcie Tworzymy zaawansowaną platformę klasy PSIM (Physical Security Information Management) wspieraną przez AI Computer Vision . Nasz system w czasie rzeczywistym zarządza bezpieczeństwem fizycznym obiektów, integruje tysiące urządzeń (kamery, sensory, systemy kontroli dostępu) i przetwarza ogromne ilości danych. Szukamy Lidera, który połączy kropki: weźmie odpowiedzialność za architekturę backendu, poprowadzi zespół programistów i przełoży wizję produktową na sprawnie działający kod. Zakres obowiązków Zarządzanie i mentoring: Będziesz liderem dla zespołu deweloperów – organizujesz pracę, dbasz o podział zadań, rozwój ludzi oraz jakość techniczną (Code Review, standardy SOLID). Strategia i Architektura: Podejmujesz kluczowe decyzje architektoniczne dla systemów rozproszonych. Projektujesz skalowalne i wysokowydajne (high-performance) usługi backendowe w .NET. Most technologiczny: Ściśle współpracujesz z zespołem AI Computer Vision, koordynując integrację zaawansowanych modeli analitycznych i sieci neuronowych z backendem. Wdrożenia i biznes: Masz realny wpływ na roadmapę produktu. Od czasu do czasu wyjedziesz z zespołem poza Warszawę (kraj lub zagranica), aby nadzorować kluczowe wdrożenia u klientów na żywym organizmie. Wymagania Doświadczenia w liderowaniu: Popartego sukcesami doświadczenia w prowadzeniu zespołu deweloperskiego (jako Team Leader, Tech Lead lub doświadczony Senior gotowy na pełen awans). Solidnego backgroundu w .NET: Minimum 5-6 lat komercyjnego doświadczenia w C#, .NET/.NET Core, ASP.NET Core, REST API, EF Core oraz MS SQL Server. Szerokiego spojrzenia na architekturę: Praktycznej wiedzy z zakresu projektowania systemów rozproszonych, wzorców projektowych i optymalizacji wydajnościowej. Pragmatyzmu i decyzyjności: Szukamy osoby, która potrafi przeciąć dyskusję, podjąć decyzję techniczną i dowieźć temat do końca. Gotowości do pracy stacjonarnej: Codziennej obecności w biurze (Plac Konstytucji) – lider dla zespołu pracującego stacjonarnie musi być na miejscu – oraz gotowości do wyjazdów wdrożeniowych. Co oferujemy Realny, namacalny produkt: Nie robimy kolejnego nudnego CRM-a ani formatki do przeklikiwania. Robimy systemy bezpieczeństwa, które ratują sytuację w realnym świecie. Pracę w zespole ekspertów: Brak korporacyjnych procedur i ustrukturyzowanych spotkań o niczym – skupiamy się na robocie. Stabilność i bezpośredni wpływ na strategię rozwoju produktu.

🏢 Summary: Remote, long-term B2B contract for an experienced .NET Software Developer supporting a European Union organization. The role covers enterprise-system design and development, technical leadership, solution architecture, quality optimization, releases, testing, and 2nd/3rd-line support. Rate: 215 PLN net + VAT per hour. 🗂️ Requirements: Completed at least one full solution lifecycle, Expertise in enterprise-level software development, UML application design, Data, business-logic and UI-layer design and development, Scrum experience, Technical team leadership capability, Technical-solution documentation skills, Problem-solving skills, At least 2 years of experience with mission-critical complex enterprise systems, Experience with asset and/or human-resources management and financial-management systems, At least one internationally recognized intermediate software-development certification relevant to the domain 📃 Skills: .NET, UML, Scrum, Enterprise, Testing, Prototyping, Configuration, Deployment 🏢 Description: Currently, for one of our Partners, we are looking for an experienced Software Developer .NET (m/f/n) to support a long‑term project delivered for an organization of the European Union based in Warsaw. Requirements: Has gone at least 1 time through the complete lifecycle of the solution Expert in developing enterprise level software systems in specified technology domain Knows UML and can design applications in UML Proficient in designing and developing: data layer, business logic layer and UI layer Worked in Scrum developments Is capable for leading technical teams Holds ability to document effectively technical solutions Presents problem solving skills Specific requirements At least 2 years of experience with mission critical complex enterprise systems including asset and/or human resources management, as well as financial management. At least 1 certification among: Intermediate level certificate in software development relevant to the domain or an equivalent certification recognized internationally (subject to acceptance as a valid credential by the Contracting Authority) Typical tasks and responsibilities Designs and develops the system Lead development teams Translates requirements into design Optimizes software from performance, security and quality points of view Produces technical documentation Estimates effort and time for development Sets software development standards Propose technical solutions for business needs and technical problems Collects and interprets software metrics Manages configuration and releases Contributes to requirements analysis, testing, quality assurance, change management, deployment Tests solutions and develops testing tools Documents developments Prototypes solutions Acts as 2nd and 3rd line support Offer: Rate: 215 PLN net +VAT/H Set-up: Remote B2B

🏢 Summary: Fully remote Senior Engineering Manager role leading a distributed team of 6–10 engineers building scalable AI products for finance teams. The role combines people leadership, technical oversight, delivery ownership, and engineering-organization scaling. 🗂️ Requirements: Experience managing distributed engineering teams, Software engineering background, Python, TypeScript, Production-scale software delivery, Cloud-native architecture, APIs, Databases, CI/CD, Automated testing, Observability, Stakeholder management, AI tools 📃 Skills: Python, TypeScript, Cloud, APIs, Databases, CI/CD, Testing, Observability, AI, Agile 🏢 Description: Position: Senior Engineering Manager (Team Lead) Type of contract: B2B or UoP Working mode: Fully remote Salary: 33 - 39k PLN/month Role overview: Our client is a fast-scaling B2B AI start-up building reliable, scalable products for finance teams. They are transforming how finance teams work by shaping how AI Agents improve operations at scale. The company is backed by a strong vision to use AI not just for insights, but for meaningful work inside critical business processes with governance and measurable outcomes. Joining them means helping shape the technical foundation, product quality, and engineering culture behind AI Agents that finance teams can trust. Your Mission: You will lead a high-performing engineering team, strengthen delivery practices, and help scale the product and engineering organization. While you may not write every line of code anymore, you still enjoy getting into the details when it matters—reviewing technical decisions, asking architectural questions, and debugging complex issues. You will foster a culture of trust, clarity, and high-autonomy, empowering your team to thrive based on the standards, support, and ownership you put in place. Requirements: Experience: Proven experience managing a distributed team of engineers, setting clear goals, and developing technical talent. Strong background as a software engineer before moving into management. Tech Stack Familiarity: Strong experience across modern software engineering, with familiarity with Python and TypeScript, giving you credibility to lead technical conversations. Delivery Mindset: Experience delivering production-grade software at scale. Strong understanding of cloud-native architecture, APIs, databases, CI/CD, automated testing, and observability. Communication & Stakeholder Management: Excellent communicator working effectively with technical and non-technical stakeholders (Product, Commercial, Customer Success, and leadership). Mindset: Positive attitude with a ‘doer’ approach. You take ownership, move quickly, and solve problems pragmatically in a fast-paced environment. Commercially minded, ensuring engineering decisions support business growth. AI-First Thinker: Embraces innovation and is excited about using AI tools to improve engineering productivity and customer outcomes. Bonus: Experience in finance, accounts receivable, payments, credit, ERP systems, or workflow automation is a strong plus. Responsibilities: Team Leadership: Lead, coach, and develop a distributed team of 6 to 10 engineers, creating a culture of ownership, accountability, collaboration, and continuous improvement. Technical Delivery: Partner closely with Product and Implementation teams to translate customer needs into clear technical plans. Drive agile delivery practices for fast, high-quality product improvements. Point of Contact: Act as the primary point of contact for CS, Sales, and implementation requests, owning triage, estimation, and configuration scoping. Quality Assurance: Own QA and release processes end-to-end to ensure reliable shipping and defect prevention. Organizational Scaling: Work closely with the CTO and leadership to scale the engineering organization, team structure, and operating rhythm. People Management: Support hiring, onboarding, performance management, and career development as the team expands. Benefits: Fully remote role in a globally distributed organization. 23 days of holiday, including flexible bank holidays. Company-wide offsites on a quarterly or semi-annual basis, including visits to international offices in the UK and US. Access to multiple frontier AI tools for daily work and experimentation. Potential share options.