Senior Frontend Engineer

Excelsior Works

. Build and maintain high-quality mobile and web applications using React Native and TypeScript .

Posted 9/24/2026full-timeSofia • BulgariaSeniorWebsite

Core Competencies

Role fit

Core Competencies

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Demonstrates expertise in building and maintaining high-quality mobile and web applications using React Native and TypeScript, with a strong focus on frontend performance optimization and user experience. Proficient in state management, API integration, and applying security and DevOps best practices throughout the development lifecycle.

Highest-signal resume keywords

React NativeTypeScriptReduxFrontend Performance OptimisationAutomated UI/Application Testing

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Applicant Tracking System Keywords

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Hard Skills

Frontend DevelopmentState ManagementAPI IntegrationPerformance OptimisationAutomated TestingCI/CDServer-Side RenderingProgressive Web ApplicationsReal-Time ApplicationsFrontend Architecture Design

Soft Skills

CommunicationCollaborationOwnership

Tools & Technologies

Redux ToolkitREST APIsDevOps Principles

Tech Stack

Tools & technologies

JavaScriptNext.jsReactReact NativeReduxTypeScript

About the role

Key responsibilities & impact

Build and maintain high-quality mobile and web applications using React Native and TypeScript
Develop reusable, scalable components and contribute to frontend architecture as the product grows
Build smooth, responsive and intuitive user experiences across different platforms and devices
Implement and maintain state management using Redux, Redux Toolkit or similar solutions
Integrate APIs and backend services into frontend applications
Optimise application performance, responsiveness and overall user experience
Write and maintain automated UI and application tests to ensure quality and reliability
Work closely with Backend, Product and Design to turn requirements into polished product experiences
Apply security, DevOps and engineering best practices throughout the development lifecycle
Participate in code reviews, technical discussions and architectural decisions, helping improve engineering standards and ways of working
Take end-to-end ownership of features from technical implementation through delivery and continuous improvement

Requirements

What you’ll need

5+ years of professional software development experience, with strong hands-on experience building frontend applications across mobile and web
Strong professional experience with React Native and TypeScript
Experience with state management solutions such as Redux, Redux Toolkit or similar
Experience integrating REST APIs and working with asynchronous data
Strong understanding of frontend performance optimisation and building fast, responsive experiences
Experience with automated UI/application testing and maintaining scalable, well-structured frontend code
Good understanding of security and DevOps principles as they apply to frontend development
Ability to make and take ownership of technical and architectural decisions and explain the reasoning behind them
Strong communication and collaboration skills
Excellent written and spoken English
Experience with Next.js, server-side rendering (SSR) and progressive web applications (PWAs) (nice to have)
Experience with real-time or frequently updating applications (nice to have)
Experience designing frontend architecture for products expected to scale significantly over time (nice to have)
Experience with CI/CD and application release processes (nice to have)

Benefits

Comp & perks

Competitive salary and discretionary performance bonus
Premium private health insurance, including dental care
€50 monthly flexible benefits allowance
Up to 25 days of paid annual leave
Hybrid working, including 1 work-from-home day per week
Opportunity to grow and have a real impact in a fast-moving international company
A collaborative environment where ownership, ideas and new ways of doing things are encouraged