{"id":2692880,"url":"https://alion.io/job/sedaro-lead-software-engineer-frontend","title":"Lead Software Engineer, Frontend","company":{"id":4390314,"name":"Sedaro","domain":"sedaro.com","url":"https://alion.io/company/sedaro","size_band":"51-200","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"BambooHR","truth_index":{"grade":"C","score":68,"open_postings":13,"ghost_share":0.538,"stale_share":0,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Frontend","role_family":"Frontend","seniority":"lead","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Arlington, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":135000,"max_usd":257000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":38},"experience_years_min":3,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"React.js","optional":false},{"name":"TypeScript","optional":false},{"name":"JavaScript","optional":true}],"status":"live","first_seen_at":"2026-05-19T00:00:00Z","employer_posted_date":"2026-05-19","last_verified_at":"2026-10-17T01:18:51Z","board_verified":true,"closed_at":null,"days_open":151,"trust":{"level":"ghost","repost_count":0,"flags":["stale","company_stale"],"days_open":151},"description":"Overview\nSedarois hiring a Lead Software Engineer to build powerful tools for modeling complex Aerospace simulations. You'llwork across the full lifecycle-from the editor where engineers model systems and missions, to the workflow tools where they schedule simulation jobs, to the 3D playback and analytics dashboards where they explore and learn from the results.\nTeam: Platform Services\nLocation: 80% in-person in Arlington, VAor Boston, MA\nU.S.Citizen or permanent resident status required\nWho We Are\nSedarois a simulation platform company. Customers use our cloud platform to simulate satellite constellations and connected fleets, enabling the design and operation of systems at unprecedented scale.Enabling customers to playback and visualize multiple constellations, drill down into individual spacecraft sub-systems, and then compare thousands of variations of a simulation is a significant challenge, all built on Cesium, React, and TypeScript.\nWe’rean early-stage company with serious traction, partnering with the Space Forceand Shield AIto deliver next-gen systems, and we’regrowing the team to match.\nWho You Are\nYou build power tools for power users. You'redrawn to interfaces where depth and efficiency matter more than onboarding simplicity.\nYou'reenergized by novel problems where there isn'ta ready-made answer.\nYou'drather ship and learn than polish in isolation. You'recomfortable with scrappy prototypes and iterating in the open.\nYou focus on impact. You care more about what your work enables than about how it was tracked.\nWhat You’llDo\nBuild modeling interfaces where users define, configure, and compose complex system models\nDevelop data visualizations and analysis tools that help users explore simulation results across thousands of scenarios\nContribute to workflow and job management UIs that let users schedule and monitor simulation runs\nExtend and maintainour design system and componentlibraries\nHelp shape information architecture and interaction patterns across the frontend\nIdentifyand address frontend performance and reliability issues as our data scale and user base grow\nBenefits\nEquity\nUnlimited PTO\n401(k)with 4% match\n100% premium payment for medical insurance\nParental Leave\nFlexible work schedule with core hours\nCompany provided lunches 3days a week\nIndustry-leading career development opportunities\nRequirements\nBachelor’s degree in computer science or equivalent experience\n3+ years of professional experience in software engineering\nProficiencywith React and TypeScript\nExperience with frontend automated testing\nExperience contributing to componentlibraries or design systems\nSolid web fundamentals (HTML, CSS, browser APIs, HTTP)","description_format":"text","description_chars":2681,"description_truncated":false,"requirements":{"experience_years_min":3,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Equity","Flexible schedule","Health insurance","Parental leave","Unlimited PTO"],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-16T09:31:18Z"}],"visa":[],"liveness":{"score":6,"band":"cold","label":"Long shot","p_open":1,"p_active":0.205,"p_room":0.28,"age_days":151,"expected_fill_days":30,"reasons":["conf:4","stale_co","ghost","win:tail","crowd:"],"computed_at":"2026-10-17T05:46:00Z"},"pay":null,"html_url":"https://alion.io/job/sedaro-lead-software-engineer-frontend","json_url":"https://alion.io/job/sedaro-lead-software-engineer-frontend.json","meta":{"generated_at":"2026-10-17T06:05:05Z","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":8318,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-18T00:00:00Z"}},"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":4390314},"rest":"https://alion.io/mcp/rest/get_company?id=4390314"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fsedaro-lead-software-engineer-frontend"},{"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%2Fsedaro-lead-software-engineer-frontend"},{"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%2Fsedaro-lead-software-engineer-frontend"},{"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/sedaro-lead-software-engineer-frontend\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fsedaro-lead-software-engineer-frontend"}]}