{"id":2091993,"url":"https://alion.io/job/rullion-senior-frontend-developer-2","title":"Senior Frontend developer","company":{"id":1795322,"name":"Rullion","domain":"rullion.co.uk","url":"https://alion.io/company/rullion","size_band":null,"is_staffing_agency":true,"employer_type":"agency","is_intermediary":false,"listed_via":null,"ats_vendor":"Schema","truth_index":null},"role":"Frontend","role_family":"Frontend","seniority":"senior","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["London, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":null,"max":650,"currency":"GBP","period":"day","gross":null,"usd_annual":214750},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Agile","optional":false},{"name":"CI/CD","optional":false},{"name":"Jest","optional":false},{"name":"Next.js","optional":false},{"name":"Playwright","optional":false},{"name":"React.js","optional":false},{"name":"TypeScript","optional":false},{"name":"Vitest","optional":false},{"name":"Git","optional":true},{"name":"JavaScript","optional":true},{"name":"Tailwind CSS","optional":true},{"name":"Twilio","optional":true}],"status":"live","first_seen_at":"2026-10-07T00:00:00Z","employer_posted_date":"2026-10-07","last_verified_at":"2026-10-10T17:28:47Z","board_verified":true,"closed_at":null,"days_open":4,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":4},"description":"Senior Frontend Developer (Contract)\nOverview\nWe are looking for a talented Senior Frontend Developer to join a high-performing engineering team working on business-critical customer and colleague applications. This is an opportunity to contribute to modern web applications, deliver impactful features, and help drive the evolution of frontend platforms in a collaborative and fast-paced environment.\nYou'll work closely with designers, backend engineers, product teams, and platform specialists to build scalable, maintainable, and high-quality solutions using modern frontend technologies.\nContract Details\nRole: Senior Frontend Developer\nContract Type: Inside IR35\n Start Date: ASAP (flexible for the right candidate)\nDuration: Until the end of 2026 with potential extension\nRate: Up to £650 per day\n Working Pattern: Hybrid - 1 day per week on-site in London (Thursdays)\nHours: 40 hours per week\nThe Role\nYou will primarily work on an established telephony platform used by customer-facing teams to manage inbound and outbound communications. The role involves delivering new features, supporting existing functionality, and helping modernise frontend systems as part of ongoing platform transformation projects.\nResponsibilities include:\nTaking ownership of frontend feature delivery from design through to production\nBuilding and maintaining React and Next.js applications\nDeveloping clean, scalable, and well-tested TypeScript code\nSupporting the migration and modernisation of existing frontend platforms\nWorking with shared component libraries and design systems\nDebugging production issues and improving application performance\nContributing to CI/CD processes and deployment pipelines\nParticipating in code reviews and mentoring less experienced developers\nCollaborating with Product, Design, Backend and Platform teams\nMaking pragmatic technical decisions that balance delivery, quality, and maintainability\nTechnology Stack\nReact\nNext.js (App Router)\nTypeScript\nTailwind CSS\nComponent Design Systems\nPlaywright\nJest\nVitest\nGit-based CI/CD pipelines\nMonitoring and observability tools\nCloud-based infrastructure environments\nEssential Skills & Experience\nStrong commercial experience with React\nProven expertise with Next.js\nAdvanced TypeScript development experience\nSenior-level frontend engineering experience\nExperience working within large-scale frontend applications\nStrong testing background using tools such as Playwright, Jest, and Vitest\nAbility to work independently while collaborating effectively within agile squads\nExperience troubleshooting and resolving production issues\nExcellent communication and stakeholder management skills\nDesirable Experience\nExperience with telephony or contact-centre applications\nKnowledge of Twilio integrations\nExperience working with design systems and component libraries\nExposure to cloud-native environments and modern DevOps practices\nPrevious experience mentoring developers and supporting technical growth within teams\nWhat We're Looking For\nWe're seeking a senior engineer who enjoys solving complex frontend challenges, delivering high-quality customer-focused solutions, and working within a collaborative engineering culture. You'll be comfortable owning features end-to-end, contributing to technical discussions, and helping shape the future direction of modern web applications.\nThis role would suit someone who combines strong technical expertise with a practical, delivery-focused mindset and a passion for building exceptional user experiences.\nRullion celebrates and supports diversity and is committed to ensuring equal opportunities for both employees and applicants.","description_format":"text","description_chars":3646,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-08T14:55:01Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"evidence":"Licensed UK visa sponsor (Skilled Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Skilled Worker","cap_exempt":false,"checked_at":"2026-10-10T06:21:00+00:00","sources":["UK Home Office: register of licensed sponsors (workers)"],"filings_for_role_12m":0}],"liveness":{"score":58,"band":"ok","label":"Likely open","p_open":1,"p_active":0.579,"p_room":1,"age_days":3,"expected_fill_days":15,"reasons":["conf:0","agency","wave","velocity","win:early"],"computed_at":"2026-10-10T05:45:15Z"},"pay":{"stated_usd_annual":214750,"is_top_pay":true},"html_url":"https://alion.io/job/rullion-senior-frontend-developer-2","json_url":"https://alion.io/job/rullion-senior-frontend-developer-2.json","meta":{"generated_at":"2026-10-11T00:57:04Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler","counted_by":"address","units_charged":1,"used_today":1265,"day_limit":5000,"remaining_today":3735,"minute_limit":60,"resets_at":"2026-10-12T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":1795322},"rest":"https://alion.io/mcp/rest/get_company?id=1795322"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Frullion-senior-frontend-developer-2"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Frullion-senior-frontend-developer-2"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Frullion-senior-frontend-developer-2"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/rullion-senior-frontend-developer-2\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Frullion-senior-frontend-developer-2"}]}