{"id":558733,"url":"https://alion.io/job/underdog-senior-software-engineer-react-native","title":"Senior Software Engineer, React Native","company":{"id":275639,"name":"Underdog","domain":"underdog.sg","url":"https://alion.io/company/underdog-2","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Greenhouse","truth_index":null},"role":"Mobile","role_family":"Mobile","seniority":"senior","employment_type":null,"work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"posting_text","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["United States"],"countries":["US"],"hiring_countries":["US"],"hiring_countries_total":1,"salary":{"min":150000,"max":220000,"currency":"USD","period":"year","gross":null,"usd_annual":220000},"salary_estimate":null,"experience_years_min":7,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"React Native","optional":false},{"name":"Ruby","optional":false},{"name":"ChatGPT","optional":true},{"name":"Claude","optional":true},{"name":"Datadog","optional":true},{"name":"JavaScript","optional":true},{"name":"LLM","optional":true},{"name":"React.js","optional":true},{"name":"Slack","optional":true}],"status":"live","first_seen_at":"2026-07-31T16:44:43Z","employer_posted_date":"2026-09-17","last_verified_at":"2026-10-28T11:56:18Z","board_verified":true,"closed_at":null,"days_open":88,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":88},"description":"At Underdog, we make sports more fun.\nOur thesis is simple: build the best product for sports fans and we will win the space. Founded in 2020, we're one of the fastest-growing sports companies ever, and there’s still so much left to do. We've built and scaled products across fantasy sports, sports betting, and prediction markets, all united in one app that’s seamless, intuitive, and actually fun to use.\nUnderdog isn’t for everyone. One of our core values is give a sh*t. The people who win here are the ones who care, push, and perform. We’re remote-first by design, but highly collaborative with regular in-person gatherings that help teams build, iterate, and move fast together.\nGot that dog in you? Join us.\nAfter all, winning as an Underdog is more fun.\nWhat you'll do:\nWe're looking for a Senior Software Engineer who specializes in React Native to help us build the core betting experience, from the moment a customer builds a slip through submission, confirmation, and settlement. Our work spans full stack in Ruby, iOS, Android, and Web products, and you'll bring deep React Native expertise to that mix, to make sure the experience holds up to a high bar for speed and reliability at scale.\nThis means owning cross-cutting problems that touch multiple platforms, driving design decisions that hold up under real production traffic, and closing the gap between how a feature is supposed to work and how it actually behaves once it ships. You'll dig into the trickiest bugs and edge cases in the betting experience, help raise the bar for what \"done\" looks like across the client, and coach other engineers along the way so the patterns you introduce actually stick.\nBuild and scale core parts of the mobile and web apps in React Native; entry building, review, placement, and tracking. The whole lifecycle.\nInvestigate and resolve critical issues in the React Native client, and put guardrails in place so they don't recur.\nLead design reviews for initiatives that cut across iOS, Android React Native clients, calling out trade-offs, risks, and failure modes before they become incidents.\nPartner with backend, product, and design on entry placement, entry confirmation, slip changes and errors, and bet history to keep the experience fast and consistent\nTurn ambiguous, cross-team goals into concrete plans with milestones and clear owners\nUse data like product analytics, error dashboards, and session data to validate that fixes actually land and to catch regressions early\nCoach other engineers on design reasoning and ownership, and create reusable patterns that other teams adopt\nAnticipate and mitigate risks in shared systems before they impact other teams or customers\nWho you are:\n7+ years of professional software engineering experience, with meaningful time spent in React Native and a solid grasp of the native iOS/Android layers underneath it\nA track record of solving cross-cutting or ambiguous problems that span multiple services, teams, or platforms; not just staying in your lane\nExperience leading technical initiatives (performance work, reliability improvements, developer velocity) with measurable before/after impact\nComfort turning unclear, high-level goals into an executable plan with milestones and owners that other teams actually align on\nA collaborative, coaching mindset; you make other engineers better through review and design discussion, not just your own output\nStrong written and verbal communication; you can make a technical trade-off legible to product, design, and other engineering teams\nExperience with mobile app performance, testability, and shipping reliable features at scale\nBonus points if you have:\nBackground in sports, fantasy, or gaming\nExperience working on wagering, betting, or other high-stakes transactional flows\nFamiliarity with Amplitude, Datadog, or similar tools for instrumenting and monitoring client-side behavior\nOur target starting base salary range for this position is between $150,000 and $220,000, plus target equity. Final compensation will be determined based on a variety of factors including relevant experience, skills and expertise, interview performance, and other market considerations.\nWhat we can offer you:\nUnlimited PTO for full-time employees (we're extremely flexible with the exception of the first few weeks before and into the NFL season)\n16 weeks of fully paid parental leave\nHome office stipend\nA virtual-first culture, but we come together a few times per year in person for offsites, trainings, hackathons, and more\nSlack reactions for every occasion\n401k with up to 5% employer match\nCompany paid health, dental, vision plan options for employees and dependents, FSA, and more\nOpportunity to celebrate your favorite sports teams through local meetups and company-sponsored events\nClaude and ChatGPT enterprise accounts\nUnderdog is an equal opportunity employer and doesn't discriminate on the basis of creed, race, sexual orientation, gender, age, disability status, or any other defining characteristic.\nCalifornia Applicants: Review our CPRA Privacy Notice here.\n[redacted]","description_format":"text","description_chars":5084,"description_truncated":false,"requirements":{"experience_years_min":7,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["401k plan","Equity","Home office","Parental leave","Unlimited PTO"],"hiring_locations":[{"name":"United States","iso":"US","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Pet Food, Supplies & Care"],"lifecycle":[{"event":"open","at":"2026-09-09T01:12:21Z"}],"visa":[],"liveness":{"score":21,"band":"cold","label":"Long shot","p_open":1,"p_active":0.588,"p_room":0.36,"age_days":88,"expected_fill_days":48,"reasons":["conf:3","win:tail","crowd:"],"computed_at":"2026-10-28T05:59:10Z"},"pay":{"stated_usd_annual":220000,"is_top_pay":true},"html_url":"https://alion.io/job/underdog-senior-software-engineer-react-native","json_url":"https://alion.io/job/underdog-senior-software-engineer-react-native.json","meta":{"generated_at":"2026-10-28T12:05:41Z","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":15905,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-29T00:00:00Z"}},"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":275639},"rest":"https://alion.io/mcp/rest/get_company?id=275639"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Funderdog-senior-software-engineer-react-native"},{"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%2Funderdog-senior-software-engineer-react-native"},{"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%2Funderdog-senior-software-engineer-react-native"},{"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/underdog-senior-software-engineer-react-native\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Funderdog-senior-software-engineer-react-native"}],"agent":{"mcp":"https://alion.io/mcp/jobs","mcp_open":"https://alion.io/mcp/open","next":[{"tool":"get_job","arguments":{"id":558733}},{"tool":"search_jobs","arguments":{"company":"underdog.sg","detail":"compact"}},{"tool":"match_people","arguments":{"job_id":558733},"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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