Fullstack Engineer (C# / .NET / React)

Fullstack Engineer (C# / .NET / React) B2B contract: 16 500 - 25 000 PLN + VAT Get to know us better CodiLime is a software and network engineering industry expert and the first-choice service partner for top global networking hardware providers, software providers and telecoms. We create proofs-of-concept, help our clients build new products, nurture existing ones and provide services in production environments. Our clients include both tech startups and big players in various industries and geographic locations (US, Japan, Israel, Europe). While no longer a startup - we have 250+ people on board and have been operating since 2011 we’ve kept our people-oriented culture. Our values are simple: Act to deliver. Disrupt to grow. Team up to win. The project and the team You will work on a large-scale analytics and intelligence platform built for a global consulting organization, supporting M&A (Mergers and Acquisitions) analysis and business decision-making. The platform combines large datasets, interactive visualizations, AI-powered capabilities, and modern cloud-native services to deliver insights to business users around the world. Your primary focus will be full-stack application development including building modern frontend applications and backend services. Additionally, you will contribute to application architecture, data integration, and AI-powered product capabilities. Technology stack: Frontend: React , TypeScript, JavaScript, Material UI (MUI), styled-components, ag-Grid, D3.js, amCharts, Mapbox GL Backend: C#, .NET (8-10), ASP.NET Core, REST APIs, Entity Framework Databases: Azure SQL, PostgreSQL Authentication & Security: OAuth 2.0, JWT, Okta, RBAC Cloud & Platform: Azure, Azure SignalR, Azure Redis Cache, Azure Blob Storage DevOps & Delivery: GitHub Actions, Docker, Kubernetes, ReSharper AI & Developer Productivity: Codex, Cursor, Claude Code, LLM-assisted development, Azure OpenAI What else you should know: Team: Product Owner, Frontend Engineers, Fullstack Engineers, Data Engineers, DevOps Engineers, Architects, UX Designers Distributed team across Europe and India Agile, collaborative, proactive and impact-driven environment Close cooperation with business stakeholders Strong ownership culture and product mindset We work on multiple interesting projects at a time, so it may happen that we’ll invite you to an interview for another project if we see that your competencies and profile are well suited for it. Your role This is a Fullstack Engineering role combining modern frontend development, backend services, and data-driven applications. You will: Develop and maintain web applications using React and TypeScript. Develop complex user interfaces for data-intensive applications. Design and implement large interactive tables, filters, and configuration screens. Integrate data visualization and mapping solutions into business applications. Develop backend services and REST APIs using C# and ASP.NET Core. Design and optimize database access layers using Entity Framework. Work with Azure SQL and PostgreSQL databases. Integrate authentication and authorization solutions using OAuth, JWT, and Okta. Implement secure multi-tenant application patterns. Collaborate closely with product, data, and platform teams. Participate in architectural discussions and technical decisions. Use AI-powered development tools to improve productivity and code quality. Contribute to the future AI capabilities of the platform. Do we have a match? As a Fullstack Engineer, you must meet the following criteria: 6+ years of professional experience in full-stack web development. Strong experience with C# and ASP.NET Core. Strong experience with React and TypeScript. Experience with component libraries such as MUI or similar design systems. Experience with data-heavy interfaces, interactive tables, advanced filtering solutions, data visualization libraries, and mapping technologies. Experience developing and maintaining REST APIs . Practical knowledge of .NET 8+ ecosystem . Experience with Entity Framework. Strong SQL skills and experience with relational databases (Azure SQL, PostgreSQL). Experience with OAuth 2.0, JWT, and role-based access control. Understanding of multi-tenant SaaS application security. Experience using modern AI-assisted development tools. Good knowledge of English (minimum C1 level). Beyond the criteria above, we would appreciate the following nice-to-haves: Experience with Nx, Azure, Redis, Blob Storage, Hangfire. Familiarity with Azure OpenAI services. Experience working with large analytical datasets. Understanding of cloud-native architectures. More reasons to join us Flexible working hours and approach to work: fully remotely, in the office or hybrid Professional growth supported by internal training sessions and a training budget Solid onboarding with a hands-on approach to give you an easy start A great atmosphere among professionals who are passionate about their work The ability to change the project you work on Department Observability Division Locations Poland Remote status Fully Remote