{"id":4032270,"url":"https://alion.io/job/toptal-senior-fullstack-engineer","title":"Senior Fullstack Engineer","company":{"id":5450,"name":"Toptal","domain":"toptal.com","url":"https://alion.io/company/toptal","size_band":null,"is_staffing_agency":true,"employer_type":"agency","is_intermediary":true,"listed_via":null,"ats_vendor":"Lever","truth_index":{"grade":"B","score":70,"open_postings":6,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":68,"computed_at":"2026-11-10T06:52:35Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":[],"countries":[],"hiring_countries":["ES"],"hiring_countries_total":1,"salary":null,"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":true,"relocation_package":false,"has_equity":false,"technologies":[{"name":"GraphQL","optional":false},{"name":"Ruby","optional":false},{"name":"Ruby on Rails","optional":false},{"name":"TypeScript","optional":false}],"status":"live","first_seen_at":"2026-11-02T18:47:50Z","employer_posted_date":"2026-11-02","last_verified_at":"2026-11-10T18:59:34Z","board_verified":true,"closed_at":null,"days_open":8,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":8},"description":"About Toptal\nToptal is a global network of top talent in business, design, and technology that enables companies to scale their teams, on-demand. With $200+ million in annual revenue and team members based around the globe, Toptal is the world’s largest fully remote workforce.\nWe take the best elements of virtual teams and combine them with a support structure that encourages innovation, social interaction, and fun. We see no borders, move at a fast pace, and are never afraid to break the mold.\nJob Summary\nThe Billing Team is dedicated to building, maintaining, and evolving the technological backbone and functionality that underpin Toptal’s financial operations across all business areas. We’re looking for a full-stack engineer with a front-end focus who is comfortable working across the front-end and back-end, and who is keen to lead initiatives and work closely with our Product team.\nBy joining the team, you’ll have the opportunity to work on multiple applications, mainly in React front-end and Ruby on Rails back-end. We love TypeScript and Ruby, and heavily use GraphQL for communication between our front-end SPA apps and their back-ends. At Toptal, we push the boundaries of what’s possible every single day, and we’d love for you to be a part of it.\nWe strive to build performant, scalable, and well-organized apps that are aligned with business goals and non-functional requirements. This is a remote position. We do not offer visa sponsorship or assistance. Resumes and communication must be submitted in English. ### Responsibilities:\nThe following information is intended to describe the general nature and level of work being performed. It is not intended to be an exhaustive list of all duties, responsibilities, or required skills.\nWrite elegant, efficient, and testable React and Ruby code that is easy to maintain and debug.\nWrite, update, and integrate your features with React front-end components.\nImplement and maintain Ruby on Rails APIs to support seamless communication between front-end and back-end systems.\nCover code with tests and perform manual testing of features, while reviewing the work of colleagues.\nAs a true teammate, continuously improve the team’s processes, brainstorm ideas, and communicate statuses and progress.\nMentor other people, provide feedback, and grow as a part of the team.\nLearn new concepts and technologies.\nIn the first week, expect to:\nBe introduced to Toptal’s practices and processes.\nStart participating in company-wide training sessions.\nSet up your local environment and get familiar with our tech stack.\nCreate your first pull request.\nIn the first month, expect to:\nFamiliarize yourself with the team’s business domain.\nContribute to our product development.\nDevelop a deeper understanding of our technology, processes, and product pipeline.\nIn the first three months, expect to:\nActively supply software planning, development, and maintenance.\nSuggest and implement improvements to Toptal’s processes and codebase, while exercising discretion and independent judgment.\nIn the first six months, expect to:\nLead technical initiatives in our team.\nDrive improvements to the codebase and processes.\nTake part in the on-call rotation.\nIn the first year, expect to:\nHave a detailed understanding of Toptal’s technical stack, collaboration rituals, processes, and performance.\nMentor Toptal’s new team members.\nQualifications and Job Requirements:\n5+ years of web development experience.\nProficient in React and TypeScript, capable of integrating front-end components with back-end systems.\nHave hands-on experience with Ruby on Rails.\nHave a demonstrable understanding of back-end and development principles, databases, clean code, and best testing practices.\nProactive and adaptable, able to lead projects and work effectively within cross-functional teams.\nConsider multiple quality dimensions like user impact, failure tolerance, code maintenance, implementation time, availability, security breaches, and performance.\nTackle complex problems but also consider multiple solutions, weigh them, and decide on the best course of action.\nBe genuinely interested in technology and love to try new things.\nStrong communication skills, capable of clearly explaining complex concepts.\nAbility to work in a fast-paced, rapidly growing company and handle a wide variety of challenges, deadlines, and a diverse array of contacts.\nYou must be a world-class individual contributor to thrive at Toptal. You will not be here just to tell other people what to do.","description_format":"text","description_chars":4523,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[{"language":"English","level":"All levels","optional":false}]},"benefits":[],"hiring_locations":[{"name":"Spain","iso":"ES","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-11-10T18:59:34Z"}],"visa":[],"liveness":{"score":52,"band":"ok","label":"Likely open","p_open":1,"p_active":0.516,"p_room":1,"age_days":8,"expected_fill_days":68,"reasons":["conf:1","agency","win:early"],"computed_at":"2026-11-10T20:38:24Z"},"pay":null,"html_url":"https://alion.io/job/toptal-senior-fullstack-engineer","json_url":"https://alion.io/job/toptal-senior-fullstack-engineer.json","meta":{"generated_at":"2026-11-10T20:38:24Z","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_verified","counted_by":"address","units_charged":1,"used_today":13337,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-11T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.1,"usd":0.01,"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":5450},"rest":"https://alion.io/mcp/rest/get_company?id=5450"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Ftoptal-senior-fullstack-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":2,"usd":0.2},"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%2Ftoptal-senior-fullstack-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.1,"usd":0.01},"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%2Ftoptal-senior-fullstack-engineer"},{"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/toptal-senior-fullstack-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Ftoptal-senior-fullstack-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":4032270}},{"tool":"search_jobs","arguments":{"company":"toptal.com","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":4032270},"note":"people open to offers who fit this vacancy"}],"note":"The same data through MCP tools: https://alion.io/mcp/open needs no sign-in (compact searches, postings, people); https://alion.io/mcp with an Alion account has everything. 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