Fullstack Software Engineer, Proton.ai

• 5+ years as a software engineer with real, demonstrable fullstack delivery — production systems, real users, real ownership. Resume-level hands-on experience, not LLM-generated portfolios
• Strong fundamentals. You understand what the code is doing and why. You can read a stack trace, reason about a query plan, debug a race condition, and tell when an agent is wrong. We are explicitly not hiring "vibe coders" who depend on AI to compensate for missing fundamentals — AI amplifies seniority, it doesn't replace it
• Daily, hands-on use of agentic dev tools. Claude Code, Cursor agent mode, Codex, or equivalent — used to ship real features, not just autocomplete. You can talk concretely about how you structure prompts, manage context, parallelize agents, and verify their output
• Generalist instinct. You're comfortable jumping between Vue, Python, SQL, infra, and integrations. You don't wait for someone else to take the layer you're "not assigned to."
• Database and systems chops. You design efficient schemas and queries, understand indexing and tradeoffs, and can reason about distributed-system failure modes
• Startup mindset. Pragmatic, fast, biased to ship, comfortable with ambiguity, close to users
• Strong communication. You can explain technical decisions to PMs, designers, and customers — in writing and in person
• Ownership and judgment. You take features from idea to production and exercise good taste on what to build, what to cut, and when AI output isn't good enough

Desirable

• We're hiring a Senior Fullstack Engineer to ship products end-to-end across our CRM platform for distributors
• This is a generalist role: any layer of the stack, any type of work — frontend, backend, data, integrations — wherever the user impact is
• You'll work closely with PMs, designers, and other engineers to scope, build, and deploy features that distributors feel directly
• Periodically, you'll work directly with customers to support onboarding, troubleshoot integrations, and help distributors get the most out of the platform
• You'll be the person who can sit with a customer's IT team, understand how their ERP is configured, and translate that into something Proton can work with. Expect occasional travel to customer sites a few times a year
• Two things make this role different from a standard fullstack opening:
• You're an AI-native operator, not a code writer. Every engineer at Proton uses Claude Code (and other agentic dev tools) as a first-class collaborator. We expect features to be designed, built, reviewed, tested, and shipped with heavy AI leverage. You should already work this way — guiding agents, structuring context, validating output, and making judgment calls AI can't
• You're a generalist by default. We don't silo engineers into "frontend only" or "backend only." When a feature needs a Vue component, a Python handler, a Postgres migration, an Airflow DAG, and an ERP integration, you're expected to handle all of it — with AI doing the typing and you doing the thinking
• Own end-to-end delivery of features — from refining tickets to deployment, monitoring, and iteration
• Operate AI coding agents (Claude Code and similar) at a high level: scope work, structure context, run multiple agents in parallel where it makes sense, and ship reviewed, production-quality output
• Move fluidly across the stack — TypeScript/Vue on the frontend, Python on the backend, SQL and data modeling, infra touchpoints. Pick up whatever the work needs
• Collaborate in a squad model with PMs, designers, and engineers; participate in 2-week sprints, standups, refinements, retros, and code reviews
• Design schemas, queries, and APIs that hold up at scale — performance, reliability, and correctness are on you, not on the agent
• Contribute to engineering practices: better patterns, better tooling, better ways to use AI across the team
• Spend time with customers onsite a few times a year — distributors operate in
• Warehouses and on sales floors, and the best product calls come from being there in person