{"id":2941247,"url":"https://alion.io/job/excelsior-works-senior-frontend-engineer","title":"Senior Frontend Engineer","company":{"id":4454711,"name":"Excelsior Works","domain":"exwo.com","url":"https://alion.io/company/excelsior-works","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":null,"truth_index":null},"role":"Frontend","role_family":"Frontend","seniority":"senior","employment_type":null,"work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Sofia, Bulgaria"],"countries":["BG"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"React Native","optional":false},{"name":"Redux","optional":false},{"name":"Redux Toolkit","optional":false},{"name":"Rest API","optional":false},{"name":"State Management","optional":false},{"name":"TypeScript","optional":false},{"name":"CI/CD","optional":true},{"name":"JavaScript","optional":true},{"name":"Next.js","optional":true},{"name":"React.js","optional":true}],"status":"live","first_seen_at":"2026-10-20T16:27:03Z","employer_posted_date":null,"last_verified_at":"2026-10-20T16:27:03Z","board_verified":false,"closed_at":null,"days_open":7,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":7},"description":"At ExWo we’re building a global digital platform focused on fairness, simplicity, and radical transparency. We’re not here to reinvent the wheel – we’re here to make it turn better. Our mission is simple: put users first, cut the nonsense, and build a product that earns trust every step of the way.\n\nRole Overview:\n\nWe’re looking for a Senior Frontend Engineer to join our Engineering team and help us build and evolve the user experience behind our global online entertainment platform. We build our platform in-house, with React Native and TypeScript at the core of our frontend development across mobile and web. You’ll work on fast, responsive and highly interactive experiences where performance, scalability and thoughtful UX genuinely matter. This is a hands-on role for someone who enjoys solving complex frontend challenges, cares about building polished user experiences and wants real ownership over the architecture and technical decisions behind them.\n\nWhat You’ll Do:\n\nBuild and maintain high-quality mobile and web applications using React Native and TypeScript.\n\nDevelop reusable, scalable components and contribute to frontend architecture as the product grows.\n\nBuild smooth, responsive and intuitive user experiences across different platforms and devices.\n\nImplement and maintain state management using Redux, Redux Toolkit or similar solutions.\n\nIntegrate APIs and backend services into frontend applications.\n\nOptimise application performance, responsiveness and overall user experience.\n\nWrite and maintain automated UI and application tests to ensure quality and reliability.\n\nWork closely with Backend, Product and Design to turn requirements into polished product experiences.\n\nApply security, DevOps and engineering best practices throughout the development lifecycle.\n\nParticipate in code reviews, technical discussions and architectural decisions, helping improve engineering standards and ways of working.\n\nTake end-to-end ownership of features from technical implementation through delivery and continuous improvement.\n\nWhat We’re Looking For:\n\n5+ years of professional software development experience, with strong hands-on experience building frontend applications across mobile and web.\n\nStrong professional experience with React Native and TypeScript.\n\nExperience with state management solutions such as Redux, Redux Toolkit or similar.\n\nExperience integrating REST APIs and working with asynchronous data.\n\nStrong understanding of frontend performance optimisation and building fast, responsive experiences.\n\nExperience with automated UI/application testing and maintaining scalable, well-structured frontend code.\n\nGood understanding of security and DevOps principles as they apply to frontend development.\n\nAbility to make and take ownership of technical and architectural decisions and explain the reasoning behind them.\n\nStrong communication and collaboration skills.\n\nExcellent written and spoken English.\n\nNice to Have:\n\nExperience with Next.js, server-side rendering (SSR) and progressive web applications (PWAs).\n\nExperience with real-time or frequently updating applications.\n\nExperience designing frontend architecture for products expected to scale significantly over time.\n\nExperience with CI/CD and application release processes.\n\nWhat We Offer:\n\nCompetitive salary and discretionary performance bonus.\n\nPremium private health insurance, including dental care.\n\n€50 monthly flexible benefits allowance.\n\nUp to 25 days of paid annual leave.\n\nHybrid working, including 1 work-from-home day per week.\n\nOpportunity to grow and have a real impact in a fast-moving international company.\n\nA collaborative environment where ownership, 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