Mid-level

Full-Stack Developer

Build, ship, and maintain modern web apps end to end. Turn clear requirements into reliable features with measurable impact. Write clean, tested code, own deployments, and improve performance and cost over time.

Location: United States or Türkiye only. We do not hire outside these countries.

What you'll deliver in your first 90 days

  • Ship 3+ user-facing features across one or two projects with on-time delivery ≥85%.
  • Critical-path tests in CI (unit + API + UI) for shipped features; PR checks blocking on failures.
  • Build-to-prod lead time ≤24 hours for your services; one-click rollback in place.
  • Performance baselines: key pages LCP ≤2.5s, API p95 ≤300ms; error rate trending down week over week.
  • DB migration and rollback playbook documented; monitoring and alerts wired for your services.
  • Two ADRs documenting significant technical choices and trade-offs.

Responsibilities

  • Implement front end views and interactions (React/Next.js) and back end services (Node/NestJS or .NET).
  • Design and evolve schemas, queries, and migrations for PostgreSQL/MySQL; use Redis/Mongo where it fits.
  • Build APIs (REST first; GraphQL where justified). Version, document, and deprecate safely.
  • Write tests at the right levels with Jest and Playwright/Cypress; integrate into CI.
  • Review PRs for correctness, performance, and security; keep PRs small and reversible.
  • Instrument code with logs/metrics/traces; debug from telemetry, not hunches.
  • Apply secure-by-default patterns: authn/z, input validation, secret handling, least privilege.
  • Optimize performance: caching, async jobs, pagination, N+1 elimination, bundle size control.
  • Collaborate with design, QA, and DevOps; participate in planning, demos, and retros.
  • Document decisions and operational runbooks where others can find and use them.

Requirements

  • 3+ years as a full-stack engineer at a startup or agency, shipping production software.
  • Strong TypeScript/JavaScript. Proficient with React and Next.js.
  • Backend strength in Node.js (NestJS/Express) or C#/.NET; plus familiarity with one of Go, Python, or Java.
  • SQL fluency (PostgreSQL/MySQL) and practical NoSQL use (Redis/Mongo). ORMs like Prisma, TypeORM, or Entity Framework.
  • CI/CD with GitHub Actions or GitLab CI; Docker-based workflows.
  • Testing mindset and practice across unit, integration, and E2E.
  • Working knowledge of AWS or GCP fundamentals.
  • Clear written communication. You leave code and docs better than you found them.
  • Time-zone overlap: minimum 4 hours with Pacific Time or Türkiye time, depending on team.
  • Based in the United States or Türkiye.

Nice to have

  • Mobile exposure (Flutter/React Native) or desktop (Electron/Tauri).
  • Edge/serverless (CloudFront/Lambda@Edge, Vercel, Cloudflare Workers).
  • Security awareness (OWASP Top 10), OAuth/OIDC, and SSO flows.
  • Analytics basics (GA4/Mixpanel) and simple SQL for checks.
  • Experience with marketplaces, healthtech, B2B SaaS, or embedded/IoT surfaces.
  • LLM/AI feature integration and prompt/tooling hygiene.

How we work

  • Two-week sprints, trunk-based development, small PRs, frequent releases.
  • Definitions of Ready/Done and release checklists on every project.
  • Written decisions live in the repo or Notion.

Application items

  • Resume or LinkedIn.
  • Links to two code samples or a small repo (redact secrets) showing both UI and API work.
  • A short note on a feature you shipped, the metric it moved, and one design trade-off you made.

Horizon Labs builds MVPs, modernizes legacy systems, and integrates complex stacks for startups and SMBs. If you like clear goals and fast ships, apply.

Ready to apply?

Apply for this role
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