Lead Full Stack Developer (.NET + React)

Andersen is hiring a Lead Full Stack Developer (.NET + React) to drive development and provide technical leadership, ensuring delivery of quality, team coordination, and alignment with architectural decisions.  The customer is an international company delivering professional and technology-enabled solutions that support effective collaboration, structured communication, and operational efficiency for organizations. It operates in a fast-growing environment, focusing on scalability, security, and continuous improvement while developing digital platforms used by diverse clients worldwide.    The project is focused on delivering full-stack engineering solutions while ensuring consistent technical execution and team coordination. It combines hands-on development with technical oversight, guiding the engineering team, supporting day-to-day delivery, and maintaining alignment across tasks and architectural decisions.    Responsibilities:  • Designing, developing, testing, and maintaining software within a .NET 4.6 monolithic MVC API and React front‑end environment.  • Taking ownership of mid‑to‑high complexity tasks and delivering reliable, production‑ready solutions.  • Modernizing and refactoring legacy .NET components to improve performance, maintainability, and scalability.  • Building and integrating React front‑end components into existing backend API flows.  • Investigating and resolving complex technical issues, optimizing system performance, and supporting distributed components.  • Providing technical supervision and direction to other engineers on the team.  • Supporting TJ by handling day‑to‑day technical guidance, ensuring that TJ focuses on high‑level oversight rather than operational details.  • Reviewing architecture decisions with TJ, propose improvements, and drive implementation consistency.  • Ensuring developers follow best coding practices, documentation standards, and architectural guidelines.  • Helping prioritize work, clarify requirements, and unblocking engineers during daily execution.  • Acting as a point of stability for the team during active development phases.  • Leading code reviews and maintaining engineering standards across backend and frontend layers.  • Collaborating with product managers, designers, and QA to deliver end‑to‑end features.  • Preparing and maintaining architectural diagrams, API specifications, and integration documentation.  • Participating in Agile ceremonies (planning, stand‑ups, retrospectives) and helping improve team workflows.    Must-have:  • Experience in full stack development for 4+ years.  • Strong experience with C# / .NET Framework 4.6, MVC, API development, and legacy code maintenance/refactoring.  • Proficiency with React (React 16+, modern hooks, component lifecycle, reusable components).  • Strong SQL Server knowledge (query design, optimization, indexing).  • Experience working with monolithic architectures and gradually modernizing them.  • Solid understanding of event patterns, asynchronous processing, and scalable design practices (even within legacy constraints).  • Ability to provide technical direction and guidance to other developers.  • Experience mentoring, supervising, or coaching engineers (formal team lead experience is a plus but not mandatory).  • Ability to structure tasks, clarify technical requirements, and support daily execution to reduce the load on TJ.  • Strong ownership mindset and ability to work semi‑independently while aligning with TJ on strategic direction.  • Level of English – from Intermediate+ and above.    Nice-to-haves:  • Experience with modern DevOps practices (Azure DevOps, CI/CD pipelines).  • State management expertise (Redux, Zustand, RTK, or similar React patterns).  • Hands‑on experience with AI coding tools (Copilot, ChatGPT, Claude Code).  • Familiarity with cloud services (Azure preferred).     Reasons why this job would be interesting to you:  • Experience in teamwork with leaders in FinTech, Healthcare, Retail, Telecom, and others. Andersen cooperates with such businesses as Samsung, Siemens, Johnson & Johnson, BNP Paribas, Ryanair, Mercedes, TUI, Verivox, Allianz, T-Systems, etc..  • The opportunity to change the project and/or develop expertise in an interesting business domain.  • Job conditions – you can work both fully remotely and from the office or can choose a hybrid variant.  • Guarantee of professional, financial, and career growth! The company has introduced systems of mentoring and adaptation for each new employee.  • The opportunity to earn an additional up to 1,000 USD per month by participating in the company's activities.  • Access to the corporate training portal, where the entire knowledge base of the company is collected and which is constantly updated.  • Bright corporate life (parties / pizza days / PlayStation / fruits / coffee / snacks / movies).  • Certification compensation (AWS, PMP, etc).  • Referral program.  • English courses.  • Private health insurance and compensation for sports activities.    Join us!  Your personal data is protected in accordance with GDPR regulations. Learn more: https://andersenlab.com/privacy-policy   https://people.andersenlab.com/