{"id":3904991,"url":"https://alion.io/job/seamless-senior-full-stack-software-engineer","title":"Senior Full Stack Software Engineer","company":{"id":21333,"name":"Seamless","domain":"seamless.ai","url":"https://alion.io/company/seamless","size_band":"11-50","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Rippling","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"explicit","locations":[],"countries":[],"hiring_countries":["US"],"hiring_countries_total":1,"salary":null,"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"AI Agents","optional":false},{"name":"Amazon S3","optional":false},{"name":"AWS","optional":false},{"name":"Claude","optional":false},{"name":"Cursor","optional":false},{"name":"JavaScript","optional":false},{"name":"MVP","optional":false},{"name":"Node JS","optional":false},{"name":"OpenSearch","optional":false},{"name":"PostgreSQL","optional":false},{"name":"React.js","optional":false},{"name":"SQL","optional":false},{"name":"Webpack","optional":false}],"status":"live","first_seen_at":"2026-11-06T22:12:19Z","employer_posted_date":"2026-11-06","last_verified_at":"2026-11-07T02:35:42Z","board_verified":true,"closed_at":null,"days_open":0,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":0},"description":"About Seamless\nSeamless is building the future of AI-powered revenue generation.\nSales professionals use our platform to identify prospective buyers, improve contact and company data, and create pipeline more efficiently. By combining proprietary data, artificial intelligence, and modern go-to-market technology, Seamless helps organizations connect with the right people and accelerate revenue growth.\nWe are continuing to invest in our platform, our AI capabilities, and the team required to define the next generation of sales technology.\nEqual Employment Opportunity\nSeamless is an equal opportunity employer. We do not discriminate on the basis of race, religion, color, national origin, sex, gender, sexual orientation, age, marital status, veteran status, disability, or any other characteristic protected by applicable law.\nVisa sponsorship is not included in our hiring package. Applicants must be authorized to work in the United States.\nWhy Seamless\nSeamless is building the future of AI-powered sales and revenue technology.\nOur platform brings together real-time B2B data, artificial intelligence, sales engagement, enrichment, automation, buyer signals, AI agents, APIs, integrations, and workflow capabilities to help revenue teams find the right buyers, improve contact and company data, personalize outreach, create pipeline, and convert more opportunities into revenue.\nAs a Senior Full Stack Software Engineer at Seamless, you will have the opportunity to:\nOwn meaningful features from concept through production, with a direct impact on the experience of our users.\nBuild scalable, high-performing applications and services that support our data search engine and social profiling platform.\nWork across our web application, Chrome extension, and connected services rather than being limited to one part of the stack.\nShape technical solutions with autonomy, collaborating closely with product managers and a lean remote engineering team.\nShip quality code iteratively, solve customer problems, and help evolve a platform that handles large volumes of data and concurrent requests.\nAt Seamless, you’ll work with a team that values simple solutions, thoughtful engineering, strong ownership, and the ability to deliver meaningful results.\nThe Opportunity\nYou’ll join Seamless’s Technology organization as part of a lean, full stack engineering team. Your work will help advance our data search engine and social profiling platform, supporting the tools customers use to find and connect with the right buyers.\nYou’ll take ownership of features from early requirements through deployment and post-launch improvement. Our architecture includes a customer-facing web application, a Chrome extension, and connected services, giving you the opportunity to contribute across the product and its underlying systems.\nYou’ll build responsive interfaces with React and modern JavaScript while designing scalable backend services that handle large datasets and concurrent requests. You’ll collaborate with product and engineering partners, make sound technical decisions, and ship practical solutions without unnecessary complexity.\nWhat You’ll Own\nOwn full stack projects and deliverables from concept through production.\nBuild scalable, performant user interfaces using React, ES6/7 JavaScript, Webpack, HTML, CSS, and related modern tools.\nDesign, develop, and implement microservices that handle large volumes of concurrent requests and data.\nCreate JSON schemas and user experience workflows that support business processes involving hundreds of millions of records.\nTranslate customer requirements into practical technical solutions that address user needs.\nShip high-quality, finished code frequently through iterative development and MVP delivery.\nDevelop complete features with substantial autonomy while communicating clearly with remote teammates.\nDrive end-to-end development from initial brief through post-launch analysis in partnership with product managers and technical stakeholders.\nSupport and improve experiences across web applications, browser extensions, and mobile platforms.\nWhat You’ll Bring\nRequired Qualifications:\nIdeally 5+ years of experience building high-quality, cloud-based web applications.\n5+ years of expertise in modern frontend technologies, including React, ES6/7 JavaScript, Webpack, HTML, and CSS.\n2+ years of experience with backend technologies including Node.js, Express, Postgres, and AWS.\nExperience working with large datasets using S3, Athena, OpenSearch, or similar services.\nStrong SQL skills and an analytical approach to problem-solving.\nExperience working with internal APIs and integrating third-party APIs.\nExperience with React Hooks and other modern React features.\nAbility to create clear documentation for new and existing features and functionality.\nExperience developing software using AI-assisted tools such as Claude and Cursor.\nPreferred Qualifications:\nBachelor’s degree.\nUI/UX design specialization.\nExperience developing Chrome extensions.\nExperience with web scraping.\nBenefits\nAt Seamless, we invest in our employees by offering a comprehensive benefits package designed to support health, financial well-being, work-life balance, and professional growth. Eligible employees have access to benefits that currently include:\nMedical, dental, and vision insurance\nHealth Savings Account and Flexible Spending Account options\n401(k) retirement plan with company matching contributions\nCompany-paid life insurance, accidental death and dismemberment, and short-term disability coverage\nVoluntary supplemental insurance options\nEmployee Assistance Program\nAnnual wellness reimbursement\nPaid time off, company holidays, and paid parental leave for birthing and non-birthing parents\nRemote-first work environment \nEmployee discount and perks program\nProfessional development, ongoing learning, coaching, and career-growth opportunities\nBenefits are subject to eligibility requirements and applicable plan documents and may be modified by Seamless at any time.","description_format":"text","description_chars":6030,"description_truncated":false,"requirements":{"experience_years_min":5,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":{"level":"bachelor","optional":false},"security_clearance":false,"languages":[]},"benefits":["Growth opportunities","Life insurance","Parental leave","Professional development","Retirement plans","Vision insurance"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Sales Enablement","Lead Generation","Marketing & Sales AI","B2B Company & Contact Data"],"lifecycle":[{"event":"open","at":"2026-11-07T02:35:42Z"}],"visa":[],"liveness":{"score":86,"band":"hot","label":"Hiring now","p_open":1,"p_active":0.86,"p_room":1,"age_days":0,"expected_fill_days":7,"reasons":["conf:1","win:early"],"computed_at":"2026-11-07T04:00:06Z"},"pay":null,"html_url":"https://alion.io/job/seamless-senior-full-stack-software-engineer","json_url":"https://alion.io/job/seamless-senior-full-stack-software-engineer.json","meta":{"generated_at":"2026-11-07T04:00:06Z","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":9708,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-11-08T00:00:00Z"}},"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":21333},"rest":"https://alion.io/mcp/rest/get_company?id=21333"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fseamless-senior-full-stack-software-engineer"},{"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%2Fseamless-senior-full-stack-software-engineer"},{"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%2Fseamless-senior-full-stack-software-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/seamless-senior-full-stack-software-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fseamless-senior-full-stack-software-engineer"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":3904991}},{"tool":"search_jobs","arguments":{"company":"seamless.ai","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":3904991},"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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