{"id":2472771,"url":"https://alion.io/job/level-senior-full-stack-webapp-engineer","title":"Senior Full-Stack WebApp Engineer","company":{"id":4417780,"name":"Level","domain":"level.me","url":"https://alion.io/company/level-14","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Ashby","truth_index":{"grade":"A","score":88,"open_postings":28,"ghost_share":0,"stale_share":0.5,"repost_share":0,"time_to_fill_p50_days":null,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Bellevue, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":97500,"max":243750,"currency":"USD","period":"year","gross":null,"usd_annual":243750},"salary_estimate":null,"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"ArgoCD","optional":false},{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"Docker","optional":false},{"name":"DynamoDB","optional":false},{"name":"gRPC","optional":false},{"name":"Java","optional":false},{"name":"Kotlin","optional":false},{"name":"Kubernetes","optional":false},{"name":"Linkerd","optional":false},{"name":"PostgreSQL","optional":false},{"name":"React Native","optional":false},{"name":"Redis","optional":false},{"name":"Rest API","optional":false},{"name":"State Management","optional":false},{"name":"Terraform","optional":false},{"name":"TypeScript","optional":false},{"name":"Datadog","optional":true},{"name":"Discord","optional":true},{"name":"Grafana","optional":true},{"name":"JavaScript","optional":true},{"name":"OpenTelemetry","optional":true},{"name":"React.js","optional":true},{"name":"SigNoz","optional":true}],"status":"live","first_seen_at":"2026-06-04T20:07:04Z","employer_posted_date":"2026-06-04","last_verified_at":"2026-10-17T13:24:05Z","board_verified":true,"closed_at":null,"days_open":134,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":134},"description":"Summary\nLevel is a learning technology company dedicated to helping students build real academic and life skills with confidence and joy. We combine proven curriculum principles with world class interactive design to make meaningful practice something students want to come back to, not something they struggle through.\nWe support what teachers, schools, and parents are already doing by increasing student engagement with high quality, standards-aligned practice that reinforces classroom learning.\nAs a Senior Full-Stack WebApp Engineer on the Platform team, you will own end-to-end slices of Level's web experience - from the browser through the API layer and into the services that power identity, accounts, onboarding, and the authoring/admin surfaces our internal teams rely on. You will architect and ship features that span TypeScript front-ends (React-family) and Kotlin/Java (JVM) backend services, partner with engineers across web, mobile, and native clients, and help raise the engineering bar on a small, senior-leaning team.\nYour work will directly impact the experiences students, educators, and internal users have every day, and the velocity at which the rest of the engineering organization can build on top of the platform.\nThis is an onsite role (5 days per week)\nWhat You Will Do\nFeature Development\nOwn full-stack feature delivery across the web client and its supporting backend services - from UX and component work down through API design, data modeling, and persistence.\n\nDesign and evolve platform-facing web surfaces - authentication, account capture, invitation and onboarding flows, embedded authoring, and admin tooling consumed by web, mobile, and native clients.\n\nImplement clean, readable, testable code on both client and server; take responsibility for features from initial design through release and ongoing maintenance.\n\nArchitecture & Backend Services\nArchitect and implement backend services and APIs (REST and gRPC) that back the web experience and are reused across product surfaces.\n\nMake explicit trade-offs on data modeling, contract design, and service boundaries; partner with backend architects on shared libraries and patterns.\n\nContribute to platform direction through RFCs, architecture reviews, and decisions about shared libraries, frameworks, and developer tooling.\n\nPerformance, Reliability & Security\nDefine and own reliability targets (SLOs/SLIs) for the services you own; implement structured logging, metrics, and tracing on top of platform standards.\n\nProfile, optimize, and tune both client and server for latency, throughput, and cost efficiency - Core Web Vitals on the front-end, p95/p99 on the back-end.\n\nApply web security fundamentals (auth flows, session/token handling, CSRF, CORS, content security) with particular care for student data and K-12 privacy requirements.\n\nParticipate in incident response and post-mortems for what you own.\n\nCollaboration & Delivery\nPartner with product, design, mobile, and infrastructure engineers to translate product intent into concrete technical designs and ship them iteratively.\n\nParticipate actively in planning, technical discussions, code reviews, and release processes - contributing practical input on feasibility, trade-offs, and implementation details.\n\nCode Quality & Technical Ownership\nEnsure high standards of performance, stability, and test coverage across the web surfaces and services you own; partner with our DevProd lead on test strategy, CI/CD, and performance benchmarks.\n\nActively contribute to improving web architecture, technical foundations, and developer experience.\n\nIdentify and address technical debt, production issues, and scalability concerns - leave the code better than you found it.\n\nMentor mid-level and associate engineers through pairing, code reviews, and technical guidance; help shape the conventions and patterns the rest of the team adopts.\n\nQualifications\nNeed to Have:\n5+ years of professional full-stack web engineering experience shipping production systems used by real users.\n\nStrong proficiency with TypeScript and a modern component framework (React preferred - React Native experience a plus given our direction on client shells); state management, accessible UI patterns, and performance optimization in the browser.\n\nStrong backend proficiency in Kotlin or Java on the JVM (Kotlin is Level's primary backend language) or TypeScript for shared platform libraries and tooling; comfort designing and operating long-lived services.\n\nSolid understanding of HTTP, REST, and gRPC + protobuf - Level's primary service-contract framework, with Backstage as the service catalog.\n\nExperience with PostgreSQL and data modeling for product features; familiarity with key-value / document stores (DynamoDB, Redis) and with caching, queues, and eventual-consistency trade-offs.\n\nWorking knowledge of AWS, containers (Docker / Kubernetes), and CI/CD pipelines as a consumer - you don't need to own clusters, but you should be effective in them. Familiarity with Linkerd, ArgoCD, Terraform is a plus.\n\nStrong testing discipline - unit, integration, and end-to-end - and a track record of partnering with QA/DevProd to ship reliably.\n\nExcellent written and verbal communication; ability to lead design discussions, write clear RFCs, and represent technical trade-offs to non-engineering stakeholders.\n\nNice to Have:\nExperience with authentication and identity systems - OAuth/OIDC, SSO, session and token management, third-party providers (Google, Discord, Apple, etc.).\n\nExperience building authoring tools, CMSes, or internal back-office applications used by editorial/operations teams.\n\nFamiliarity with OpenTelemetry, structured logging, and modern observability stacks (SigNoz - Level's stack - Grafana, Datadog).\n\nBackground in EdTech, K-12, or other domains with strong privacy and accessibility requirements (FERPA, COPPA, WCAG).\n\nExperience contributing to or maintaining shared design systems and component libraries.\n\nExposure to Backstage, internal developer platforms, or other developer productivity surfaces.\n\nScorecard\nMission\nShip and operate the web-facing slices of Level's platform - identity, onboarding, authoring, and admin - at a quality bar that lets every other product team build on top with confidence.","description_format":"text","description_chars":6276,"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":[]},"benefits":[],"hiring_locations":[],"hiring_excludes":[],"relocation_offered":false,"industries":[],"lifecycle":[{"event":"open","at":"2026-10-13T20:21:59Z"}],"visa":[],"liveness":{"score":6,"band":"cold","label":"Long shot","p_open":1,"p_active":0.2,"p_room":0.28,"age_days":134,"expected_fill_days":26,"reasons":["conf:2","stale_co","velocity","win:tail","crowd:"],"computed_at":"2026-10-17T05:46:00Z"},"pay":{"stated_usd_annual":243750,"is_top_pay":true},"html_url":"https://alion.io/job/level-senior-full-stack-webapp-engineer","json_url":"https://alion.io/job/level-senior-full-stack-webapp-engineer.json","meta":{"generated_at":"2026-10-17T15:08:18Z","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":20408,"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":4417780},"rest":"https://alion.io/mcp/rest/get_company?id=4417780"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Flevel-senior-full-stack-webapp-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%2Flevel-senior-full-stack-webapp-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%2Flevel-senior-full-stack-webapp-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/level-senior-full-stack-webapp-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Flevel-senior-full-stack-webapp-engineer"}]}