Jobs Lviv, React.js

Blackthorn Vision is seeking a Middle Full-Stack Engineer (React + .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 React, TypeScript, JavaScript, HTML, and CSS.
• 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.
• Upper-Intermediate English.

Nice To Have:

• Experience with Kubernetes, Docker, and RabbitMQ.

Responsibilities:

• Develop and maintain high-quality software solutions using React and .NET 10.0.
• 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).

About the vacavncy:

We are a young and rapidly growing company with almost 200 highly skilled developers of various levels.  As this opportunity requires working from our office, it is open exclusively to Lviv residents. 

We offer free English language courses for employees. Also we provide free corporate housing for our employees from other cities.

What we expect from the candidate:

- Experience in building responsive user interfaces and designs using HTML/CSS.
- Solid knowledge of JavaScript and React/Next.js.
- Understanding of the latest trends and best practices in front-end development.
- Ability to use dev tools, debugger and package managers (npm, yarn).
- Basic understanding of REST principles.
- Experience with Git.
- Knowledge of how to effectively use GitHub during teamwork.
- Excellent communication skills and a collaborative mindset, ability to work with   minimum supervision.
- Knowledge of React will be a plus.
- English level B1 - the ability to communicate with clients, to read and understand documentation in English.

What we offer:
- Personal corporate English language academy
- Flexible and accommodating working hours.
- Welcoming and amiable work environment in a comfortable office space.
- Official employment with a competitive salary that reflects your experience and skills.
- A supportive team of seasoned developers and managers.
- Exciting opportunity to contribute to innovative projects.

React.js Developer (on-site)

We're a fast-growing tech company building modern, innovative digital products — and we're looking for a React.js Developer to join our team in Lviv. If you're passionate about crafting clean, responsive UIs and writing JavaScript that's a pleasure to maintain, we'd love to hear from you.

What you'll be doing

You'll work as part of a cross-functional team to build and improve user-facing features, develop scalable frontend architecture, and collaborate closely with designers and backend developers to deliver polished, high-quality products.

What we're looking for

HTML / CSS / Preprocessors

• Strong command of HTML5 and CSS3
• Hands-on experience with SASS, including mixins and style generators
• Ability to build cross-browser compatible, responsive layouts that work seamlessly across all screen sizes and devices

JavaScript / TypeScript

• Confident use of modern JavaScript (ES6+)
• Solid foundational understanding of TypeScript
• Competence in handling and managing DOM events

React & State Management

• Practical experience developing applications with React
• Experience applying modern React hooks in real projects
• Working knowledge of state management tools, including Redux

General

• Responsible, self-motivated, and comfortable working both independently and as part of a team

What we offer

• Full-time, in-office position in Lviv
• Official employment and a competitive salary based on your skills and experience
• Company-provided equipment
• A well-structured work schedule
• A friendly, supportive team and a comfortable office environment
• Mentorship and guidance from experienced colleagues
• Interesting and technically challenging projects to grow on

How to apply

Send us your CV - we review every application and get back to candidates promptly. This could be the start of something great.

Insiders is a fast-growing IT company which employs about 200 people. Our company focused on providing innovative digital services and cutting-edge technologies to solve complex business challenges.

We are located in Lviv and currently work in an office format. For candidates from other cities, we offer relocation (an apartment located near the office, this option is free).

What we expect from the candidate:

- Experience in building responsive user interfaces and designs using HTML/CSS.
- Solid knowledge of JavaScript and React/Next.js.
- Understanding of the latest trends and best practices in front-end development.
- Ability to use dev tools, debugger and package managers (npm, yarn).
- Basic understanding of REST principles.
- Experience with Git.
- Knowledge of how to effectively use GitHub during teamwork.

what we offer:

- free study in our Corporate English Academy

- growth and development opportunities for young developers even if you have no commercial experience

- regular salary review (after the completion of each contract)

- provision of Apple equipment

- comfortable office with all amenities not far from the center (uninterrupted internet, generator, tea and coffee, pastries).

- timely payment of salaries.

- corporate events, teambuildings, etc.

- working on projects side by side with Senior developers, which will give you the opportunity to learn and develop.