FullStack .NET Developer (React)

OPTIVEUM sp. z o.o.; Polska; Ibrido; PLN 201.000 - 279.000; Tempo pieno

Vantaggi offerti da questo lavoro

Hybrid work policy

Modern Warsaw Office

Competitive compensation

Descrizione del lavoro

OPTIVEUM sp. z o.o. seeks a Senior FullStack Developer to bridge backend .NET services and modern frontend with React. You’ll own features end-to-end, design RESTful APIs, and contribute to a cloud-native microservices platform on Azure.

You will collaborate with US product managers, mentor teammates in Warsaw, and deliver world-class UX in a fast-paced US tech culture with a hybrid work model in Warsaw.

Competenze

• 5+ years of .NET (6/8+) and C# experience building RESTful APIs.
• Frontend experience with React and TypeScript.
• Azure cloud experience with App Services, Functions, Cosmos DB/SQL.
• SQL Server and Entity Framework Core expertise.
• CI/CD with Azure DevOps or GitHub Actions.
• Excellent English (C1).

Mansioni

• Own features end-to-end from database to final React component.
• Contribute to Cloud-Native microservices architecture on Azure.
• Maintain high coding standards (SOLID, Clean Code, design patterns).
• Develop responsive, high-performance React applications.
• Collaborate with US PMs and stakeholders to translate vision into reality.
• Mentor and conduct code reviews for the Warsaw hub.

Conoscenze

.NET

React

TypeScript

REST APIs

Strumenti

Docker

Kubernetes

Azure DevOps

GitHub Actions

Descrizione del lavoro

About Optiveum and our Client Optiveum is a boutique talent advisory firm. We help our clients build high-performance technology teams that move the needle. We are currently looking for a Senior FullStack .NET Developer for our client—a fast-growing US-based leader in the Financial Technology sector . With a major engineering hub in Warsaw , they are blending American innovation and "move-fast" culture with top-tier Polish engineering talent. You’ll be joining an environment that skips the bureaucracy in favor of high ownership, architectural excellence, and a product-first mindset.

The Role As a Senior FullStack Engineer, you aren’t just executing tickets; you are a product builder . You will bridge the gap between robust, high-scale backend services and modern, highly interactive user interfaces. This role is perfect for someone who thrives in a fast-paced US tech culture, enjoys solving complex distributed systems puzzles, and cares deeply about delivering a world-class User Experience (UX).

Your Responsibilities

• Full-Scale Development: Own features end-to-end, from database schema and API design to the final React component.
• Architecture & Scale: Contribute to the evolution of a Cloud-Native microservices architecture on Azure, designed to handle global traffic.
• Engineering Excellence: Maintain high standards (SOLID, Clean Code, Design Patterns) while maintaining the velocity needed for a competitive US market.
• Frontend Leadership: Drive the development of responsive, high-performance web applications using React.
• Global Collaboration: Partner closely with US-based Product Managers and Stakeholders to translate vision into scalable technical reality.
• Mentorship: Lead by example through Code Reviews and knowledge sharing, helping elevate the Warsaw engineering hub.

Requirements

• Backend Expertise: 5+ years of experience in .NET (.NET 6/8+) and C#. Expertise in building RESTful APIs and event-driven architectures.
• Frontend Mastery: Solid experience with React and TypeScript . Familiarity with state management (Redux, Zustand, or React Query).
• Cloud-Native Mindset: Practical experience with Azure (App Services, Functions, Service Bus, Cosmos DB/SQL).
• Database Knowledge: Strong skills in SQL Server and Entity Framework Core.
• Modern DevOps: Hands-on experience with Docker, Kubernetes, and CI/CD pipelines (Azure DevOps/GitHub Actions).
• Language: Excellent English (C1) – essential for daily collaboration with the US team.

Nice to Have

• Experience in high-growth FinTech, WealthTech, or high-frequency trading environments.
• Knowledge of testing frameworks (xUnit, Jest/Cypress).
• Familiarity with Web Performance optimization and Accessibility (WCAG).

What We Offer

• US Tech Culture: A transparent, high-growth environment that values "radical candor," innovation, and taking initiative.
• Professional Growth: Access to the latest tech—we operate on the "bleeding edge" of .NET and React.
• Modern Warsaw Office: A vibrant, well-located hub for collaboration, combined with a flexible hybrid/remote policy.
• Competitive Compensation: 18.000 - 25000 PLN B2B
• Global Scale: Your code will power mission-critical systems used by financial professionals and institutions across the US and globally.