Senior Full Stack Engineer

CtrLoop. Why we built it The loop Careers Contact All roles Apply → Careers / Open role Senior Forward-Deployed track Senior Full Stack Engineer Deep Python + JavaScript/TypeScript. You'll own the biggest features end-to-end as Engineer DRI from day one - frozen contracts, parallel builds with Claude Code, flag-gated launches with the metric wired first - hold the technical bar at the review gates, mentor a junior engineer, and lead forward-deployed engagements executing external projects on our pipeline. Full-time 1 opening 5+ years shipped scope over tenure Python + JS/TS Backend Web App Client-facing Apply for this role → What you'll do How we build No sprints. No staging. No hand-offs. Every feature runs a 10-stage pipeline where Claude does the heavy lifting and a human DRI - one directly responsible engineer - drives every step. 01 Contract-first A frozen backend↔frontend contract + simulator before any code - so both sides build in parallel against the same reality. 02 AI-native execution Claude Code writes most of the code. You direct it, review it, and verify it by running the app - not by trusting the diff. 03 One Design System Every screen is composed from a living component library; anything new is contributed back. Build it in the system, not the feature. 04 Flags, not staging Verify locally, merge dark behind a feature flag in production, dogfood there, flip it on. Rollback is one click. 05 Artifacts, not meetings Each step outputs a structured doc the next step's Claude reads directly. Three synchronous touchpoints per feature - that's it. 06 Done = demonstrated Screenshots, green gates, a flag, and a one-click rollback - never just "code written." What you'll do Own it end-to-end. Raise the bar. Lead forward. The contract is the keystone of the whole pipeline - and designing it is your craft. Two build tracks work against what you freeze; ambiguity in your writing becomes rework in two codebases. 1 Own features Engineer DRI day oneDesign the frozen contract + simulator from the founder's PRD; lock decisionsBuild backend ∥ frontend in parallel with Claude Code across Python/Django, TypeScript web, and React NativeIntegrate against a local backend, verify every flow with evidenceLaunch behind a flag - success metric wired to a live dashboard before the flip 2 Hold the bar Gates spine mentorshipBe the human reviewer at the gates: architecture, scalability, contract adherence, design-system consistencySteward the persistent spine - contract registry, component library, conventionsMentor the junior engineer: review their contracts, hold their gates, raise their slopeEvolve the pipeline itself - the playbook is a living repo you can PR 3 Lead forward External engagements First into the room: install the portable pipeline on the client's reposScope with the client, design the contract, build with Claude, demo working softwareAbsorb the punch list, come back with it fixed, launch behind their flagFeed what you learn back into the loop What we look for Depth on both sides of the stack - and judgment. Must-haves 5+ years shipping production full-stack software - we index on the scope of what you've shipped, not tenurePython depth - Django/DRF (or comparable) in production: data modelling, migrations, auth, background jobs, tests, Postgres, performance under real loadJavaScript/TypeScript depth - React on web plus React Native, or a shipped comparable mobile appArchitecture judgment - API/contract design, failure modes, scalability trade-offs; you can review someone else's design and make it better in one passAI-native working style - an AI coding tool is already your daily driver; you direct, review, and correct its output fast, and verify by running the appWritten clarity - your contracts are frozen documents two build tracks work againstOwnership and review leadership - you drive features to live without being chased, and make the people around you betterClient-facing composure - scope, demo, absorb critique, iterate live; you'll lead engagements early Nice-to-haves Feature-flag-gated rollouts; observability and product analytics (Mixpanel, Sentry)LLM/agent product experience - prompting, evals, tool use / MCPDevOps - GCP, Docker, CI, systemd; enough to self-serve a deploymentMobile releases (TestFlight / Play Console), push-notification plumbingPrior mentoring or tech-lead experience What you get Run the model. Shape the model. 01 The operating model An AI-native pipeline most companies are still theorizing about - you run it daily and help evolve it. 02 End-to-end ownership Your name on the feature from frozen contract to live metric dashboard. 03 The lead FDE seat Client-facing, high-trust, high-leverage - entire external engagements run your way. 04 Claude, on us Claude as your pair on everything, on the company's dime. 05 A team worth raising A junior engineer whose slope you own, founders as your product pair. 06 Leverage, not meetings Three synchronous touchpoints per feature; the rest is you, Claude, and the pipeline. Hiring process Built like the job. The centrepiece is a paid, timeboxed design + build exercise where using AI isn't just allowed - it's required. We give you a small PRD; you design the contract + simulator spec, ship a vertical slice, and return the contract doc, a working demo, and green gates. 01 Intro call 30 min bring the biggest thing you've shipped 02 Design + build Paid timeboxed AI required 03 Architecture deep-dive 90 min defend your contract 04 Offer Fast Your contracts need no follow-up call? Let's talk. Email us with the biggest things you've shipped - repos, live products, systems you designed. Working software beats résumé lines. Location and compensation are discussed during the process. Apply - Senior Full Stack Engineer → Earlier in your career? See the junior role Applications go to careers@ctrloop.ai with the role in the subject line. CtrLoop. The execution loop for AI-native enterprises Careers support@ctrloop.ai ctrloop.ai © 2026 CtrLoop