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

Blackthorn Vision LLC.; Polska; Hybrid; PLN 180,000 - 300,000; Full time

Benefits offered by this job

On-site visits

Professional development program

Courses & library access

Free English classes

Vacation days

Medical insurance

Maternity leave

Employee referral program

Recognition program

Pet-friendly and eco-friendly

Direct communication with management

Job summary

Blackthorn Vision LLC. in Poland is seeking a Middle/Middle Strong Full-Stack Engineer (React and .NET) to join a remote team.

You will contribute to both frontend and backend, owning features from design through deployment, and collaborating across product, design, and QA to deliver robust software. Ideal candidates have 3+ years of commercial experience, strong .NET/C#, and hands-on work with React, Redux Toolkit, REST APIs, and modern data stores.

Qualifications

• 3+ years of commercial software development experience.
• Strong production experience with .NET / C#.
• Experience with Redux Toolkit / RTK Query, REST APIs, and complex 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 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.

Skills

.NET / C#

Redux Toolkit

RTK Query

REST APIs

Entity Framework

MongoDB

SQL Databases

NoSQL Databases

Microservices

Kubernetes

Docker

RabbitMQ

Design Patterns

React Router

React Hook Form

Zod

Frontend Testing

Authentication

Accessibility

Responsive UI

Tools

React

Redux Toolkit

RTK Query

Entity Framework

MongoDB

SQL

NoSQL

Kubernetes

Docker

RabbitMQ

Job description

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.