Middle/Strong Middle Full-Stack Engineer (React and .NET)

Middle/Strong Middle Full-Stack Engineer (React and .NET)

Lviv, Poland, Remote

Blackthorn Vision is looking for a Middle/Middle Strong Full-Stack Engineer (React and .NET). Our client, established in 2011 and based in Colorado, is a leading player in the U.S. application management market. We’ve had a successful partnership with this client and are seeking candidates who are eager to take ownership and improve a product already trusted by over 6,000 enterprises.

Requirements:

• 3+ years of commercial software development experience .
• Strong production experience with .NET / C# .
• Experience with Redux Toolkit / RTK Query , REST APIs, and complex application state.
• Understanding of data access technologies , including Entity Framework and MongoDB.
• Experience with both SQL and NoSQL databases .
• Experience with microservice-oriented architecture, parallel, and asynchronous programming design patterns .
• Experience with Kubernetes, Docker, and RabbitMQ .
• Knowledge of design and architectural patterns .
• Familiarity with React Router, React Hook Form, Zod, and frontend testing .
• Understanding of authentication, permissions, accessibility, and responsive UI .

Responsibilities

• Develop and maintain high-quality software solutions using .NET 10.0 and React .
• Take full ownership of delivering new features to end users, including designing architecture, implementing, testing, and onboarding the customer support team with new functionality.
• Build and maintain complex features across customer and admin portals .
• Integrate APIs and deliver reliable, tested user experiences.
• Implement access controls, feature flags, and real-time UI updates .
• Collaborate with product owners, the support team, end users, product, design, backend, and QA teams to understand project requirements and deliver solutions.
• Participate in code reviews to enhance overall code quality.
• Ensure applications are high-performing, responsive, and of excellent quality .
• Troubleshoot and resolve technical issues and defects promptly.
• Create code documentation, technical specifications, and architecture diagrams for new features.
• Follow Agile methodologies and participate in regular sprint planning and review meetings .

You are compatible with us if you:

• Have a strong product mindset.
• Have a proactive approach to taking ownership of decisions/features.
• Possess a strong, curiosity-driven mindset.
• Are comfortable with challenges.
• Have the ability to collaborate and build relationships with diverse personalities.
• Demonstrate customer-focused decision-making.
• Exhibit clear and timely communication.Are open to giving and receiving constructive feedback.
• Value the quality of your code.
• Are able to solve the required technical tasks and communicate throughout the process (for example, asking clarifying questions promptly).

We offer:

• exciting and challenging work in a friendly and professional environment;
• excellent career opportunities and competitive salary;
• on-site visits to customers;
• professional development program with internal seminars on technical topics;
• courses, certifications, and access to the corporate library;
• free English classes;
• 18 working days of paid vacation (24 calendar days), 5 full-paid sick leave days, paid public holidays;
• medical insurance;
• maternity leave;
• employee referral program;
• recognition program with gifts and awards;
• pet-friendly and eco-friendly;
• direct and easy communication with management and much more.