Lemon.io

FS Engineer for Intelligence Product for Nuclear Operators (US citizens only, NYC on-site)

#56609456692

Full-stack Web Developer, Senior

Basic info

Involvement40h/week
Project typeFull-time
Durationongoing, long-term; W2 after 2 months of contracting
Start date2-3 weeks preferred, but a longer notice is not a blocker
Client time zone(GMT -5:00) Eastern Time (US & Canada), Bogota, Lima
Overlapfull overlap/NY on-site work

Direct client offer

The client is looking for in-house hire

Skills

Must-have:

Python
Typescript
Next.js
React
Infrastructure provisioning

Nice to have:

AI

Nice to have experience with/in:

AI
cloud computing
cybersecurity
energy
SaaS
software development

Required soft skills:

Communication
Delivery, impact, and autonomy
Product first/client first mindset
Coaching and teaching

Note from a customer

Confident, reliable, strong communicator, able to work independently and securely under time constraints. Former founder, someone not limited to the language, with curiosity and strong evidence of doing things, going between stacks. Evidence of cross‑cultural communication and a background in big tech or startups is appreciated.

Project description

Client's goal:

Support existing product / speed up development

The Mission: The Company builds the intelligence layer that makes nuclear power actually deployable—collapsing regulatory workflows from months to days. The product already powers engineering and compliance work for utilities, advanced reactor companies, and hyperscalers. We pair deep nuclear domain expertise with world-class product execution and move with startup speed.

You'll build alongside engineers from Tesla, SpaceX, Lockheed Martin, Google, and Microsoft. You'll learn from nuclear and national security experts who cut their teeth at the Nuclear Regulatory Commission, CIA, and NuScale.

The Role (reporting to the CEO): We need a Founding Full-stack Engineer to turn complex engineering and regulatory workflows into intuitive, production-grade software. This is an ownership-first role. You'll architect and ship product features end-to-end—from database design to API contracts to pixel-perfect UI. Think 60% frontend / 40% backend with the autonomy to make technical decisions and the accountability to own outcomes.

Most weeks you'll be designing new flows, implementing features, and refactoring systems—then immediately seeing customers use what you shipped.

You will:

  • Build user-facing features: translate messy regulatory workflows into clean, intuitive UI/UX that nuclear professionals actually want to use.
  • Own the stack: design APIs, optimize queries, implement frontend interactions, and debug production issues—whatever it takes to ship.
  • Set product standards: you're early enough to define how we think about code quality, design systems, testing, and the entire product development process.
  • Collaborate with domain experts: work directly with nuclear SMEs and AI engineers to understand complex requirements and ship solutions that actually solve problems.
  • Balance speed and craft: know when to optimize for polish and when to ship fast; make tradeoffs consciously and communicate them clearly.
  • Lead by example: as the team scales, you'll mentor other engineers—but first, you'll prove the playbook yourself.

A sample week: ship new document collaboration feature; refactor search results to improve load time by 40%; pair with AI engineer to integrate new model output; design mockups for compliance workflow redesign; debug production issue reported by customer; review two PRs.

What You've Done/Must-haves

  • 3–8 years fullstack experience building production web apps. You've shipped features users depend on daily and owned parts of the product top to bottom.
  • Strong frontend chops: expert-level TypeScript/React, deep understanding of modern frontend patterns, and genuine care about UI/UX details.
  • Strong backend fundamentals: comfortable with APIs, databases, auth, and backend architecture. You can debug performance issues and design scalable systems.
  • Infrastructure: you should understand production app infrastructure, including configuration and deployment.
  • Product sense: you think about business outcomes, not just code. You ask "why are we building this?" and "how will users actually use it?"
  • Ownership DNA: you've led projects, made technical decisions, and been accountable for outcomes—not just tickets.
  • Bonus points: experience with technical SaaS, regulated industries, or you have strong design taste and can mockup flows in Figma.

Who You're Building For

Our customers are the critical operators in the nuclear industry—the professionals keeping 20% of U.S. electricity safe and reliable. They're:

  • Overworked and under-resourced: carrying the weight of the grid on their backs
  • Navigating byzantine regulations: decades-old processes that slow everything down
  • Desperate for modern tools: they deserve software as good as what consumer tech gets

The products you build will help them:

  • Onboard and train faster—reducing time-to-productivity from months to weeks
  • Execute safety-critical workflows—with confidence, speed, and audit trails
  • Keep vital infrastructure safe—because "good enough" isn't good enough in nuclear
  • This is meaningful work in the truest sense—you're giving frontline professionals the tools they need to secure the energy backbone of our society.

What's at Stake

  • If we succeed: Operators get world-class tools, nuclear scales to meet exploding energy demand, and we power the AI era with clean energy. The products you build directly accelerate deployment.
  • If we fail: Nuclear remains stuck in red tape, operators stay overworked without modern tools, and humanity misses a once-in-a-generation chance to solve climate.

What Success Looks Like (90 days)

  • Shipped ≥3 major features to production that customers actively use.
  • Product quality standards you set (testing, code review, design patterns) are now team norms.
  • Customer-reported bugs down ≥50% because you improved monitoring, testing, or reliability.
  • You've owned a critical system—search, document viewer, compliance workflow, or core infrastructure—that other engineers depend on.
  • At least one product decision you made (architecture, UX flow, or technical tradeoff) is now the way we do things.

Growth Path

  • Strong founding fullstack engineers typically grow into Head of Engineering, Product Lead, or CTO-track roles as the company scales.
  • First, you'll prove you can own product features and set the bar for execution.

Why Us

  • Work with the best: high-caliber, wartime team that builds things that scale
  • Build shit that matters: products that keep the grid safe and accelerate the clean energy future

We are looking for a US citizen based in NYC:

  • Top of market base + meaningful equity in a fast-growing company; standard benefits (health/dental/vision, FSA, wellness stipend)
  • IRL in NYC (midtown/Bryant Park) 5 days on-site. Occasional travel to nuclear power plants and conferences.

Project tech stack

  • Backend: Python
  • Frontend: React, TypeScript, Next.js
  • Nice to have: AI/ML (embeddings, fine-tuning, multimodal/vision models, hallucination mitigation)

Client selection process

Pre-vetting with Lemon.io:

  • Screening round
  • Technical interview

Client's selection process:

  • Screening round
  • Technical round
  • Vibe check with Chief Nuclear Officer
  • Final round with co-founder

Team and communication

Direct collaboration with senior engineer(s)

Team size

1-3

Selection process

  1. Send your application and availability.
  2. Complete your profile and verify your Full-stack Web Developer role. Existing verification is reused.
  3. We review whether you’re a fit for this project and decide on the next step.
  4. If you’re selected, we send your profile to the client for review.

Your progress stays with you, even if this project closes.

Looks like a fit?

Hit apply and we’ll guide you through the next steps.

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