Strong Junior Full-Stack Engineer (React and .NET)

Blackthorn Vision LLC.; Polska; Hybrid; PLN 90,000 - 130,000; Full time

Benefits offered by this job

On-site visits to customers

Professional development program

Courses and certifications

Access to corporate library

Free English classes

Paid vacation (18 working days) + 5+6?

Job summary

Blackthorn Vision is seeking a Strong Junior Full-Stack Engineer specialized in React and .NET. You will contribute to both frontend and backend features, work on complex state management, and own parts of the product with guidance from senior engineers.

Responsibilities include building features for customer and admin portals, integrating APIs, and ensuring secure, scalable UI and data access. A collaborative, Agile environment with ongoing learning and certification opportunities is provided.

Qualifications

• 2+ 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 Azure technologies, including Azure Entra ID, Azure Storage Accounts, Azure Service Bus, and Azure Container Registry.
• 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#

React

Redux Toolkit / RTK Query

REST APIs

Async programming

Authentication/Authorization

Accessible UI

Frontend testing

Design patterns

Tools

Entity Framework

MongoDB

SQL

NoSQL databases

Azure (Entra ID, Storage, Service Bus, ACR)

Kubernetes

Docker

RabbitMQ

Job description

Strong Junior Full-Stack Engineer (React and .NET)

Lviv, Poland, Remote

Blackthorn Vision is looking for a Strong Junior 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:

• 2+ 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 Azure technologies, including Azure Entra ID, Azure Storage Accounts, Azure Service Bus, and Azure Container Registry.
• 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.

Nice To Have:

• Experience with Kubernetes, Docker, and RabbitMQ.

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.