Full-Stack Engineer - Internship

**Company:** HyLight (YC S23)

**Location:** Base 217, Brétigny-sur-Orge — accessible via RER C

**Team:** Platform

**Duration:** 4 - 6 month internship, starting in 2026

Job Summary

HyLight designs and operates next-generation airships for aerial inspections. Our HyLighters fly long-range, low-emission missions to inspect energy infrastructure - detecting methane leaks on pipelines and defects on power lines.

As we scale toward industrial volume, the bottleneck is no longer just flying - it's everything _around_ the flight. We're looking for a **Full-Stack Engineering Intern** to join the **Platform Team** and help us build the internal tools, ground station software, and cross-team automations that let HyLight operate at scale.

**The Platform Team is making the bridges between each team to build reliable, unified solutions meant to industrialize our processes and keep the team focused on what matters the most.** From sales automations to operational deployment - we build the internal engine of the company.

Missions

Internal Tools

- **Ship internal applications.** Build the apps the team uses every day - for operations, regulatory, sales, and tech. Think mission planning, fleet & inventory tracking, post-flight review, regulatory dashboards, CRM-adjacent tooling, ...

- **Understand the business and model it.** Spend time with the teams you build for, learn how the company actually operates, and translate that into clean data models and the right abstractions in code.

- **Automate manual workflows.** Identify the repetitive, error-prone steps that slow the company down - regulation & compliance paperwork, hand-offs between teams, status updates -and replace them with software.

- **Integrate the systems.** Connect the tools the team already uses (Notion, Slack, GitHub, OnShape, etc.) so data flows automatically and a single source of truth exists across the company.

- **Hard, domain-specific problems.** Help operations turn a vast set of criteria - weather, airspace, regulation, fleet availability, mission objectives - into a concrete flight schedule.

- **Contribute to the ground station** - telemetry dashboards, sensor feeds, and pilot-facing tools - working hand-in-hand with the embedded team on clean contracts between the aircraft and the ground.

Engineering

- Contribute to the APIs and services supporting frontend applications and integrations.

- Participate in creating automations and implementing AI-powered tools.

- Learn and apply good engineering practices around testing, scalability, and code quality.

- Collaborate closely with the Head of Platform and other engineers.

Profile Sought

Education and experience

- Currently pursuing a Bachelor's or Master's degree in Computer Science, Software Engineering, or equivalent practical experience.

- Looking for a 4–6 month internship starting in 2026.

- Interest in building tools that people inside the company will use every day.

Technical skills

- **Frontend:** comfortable with React / Next.js, TypeScript, TailwindCSS, or similar.

- **Backend:** comfortable with Node.js frameworks (NestJS, Express) or Python (FastAPI), REST, relational databases (PostgreSQL).

- Comfortable with **Git, Docker, AWS, Railway, and CI/CD pipelines** , and modern web app fundamentals.

- **Comfortable leveraging AI tools to ship faster** (Cursor, Claude Code, Copilot, …).

- **Bonus:** familiarity with **GIS tools / geospatial stacks** (MapLibre, Mapbox GL, Leaflet, PostGIS, GeoJSON, vector/raster tiling), **C/C++**.

Soft skills

- **Curious.** You ask why things are built the way they are, and you go figure it out when no one answers.

- **Open-minded.** You hold opinions strongly, but you change them when shown something better. You assume good intent.

- **Genuinely autonomous.** Hand you a fuzzy problem, you come back with a v1 and the right follow-up questions - not waiting to be told the next step.

- **Passionate.** You genuinely care about what you do - you build, you read, you tinker, you have opinions. Whether it's code, climate, aerospace, or anything else, you bring real interest to the table.

- **At home in a high-pace environment.** Priorities shift, decisions are made fast, reality wins over plans. You see that as fuel, not friction.

Languages

- **English required** (internal communication and documentation).

- **French is a plus.**

What We Offer

- Hands-on internship with **real responsibility and direct impact from day one**.

- Mentorship from the CTO, the Head of Platform, and engineers across the stack.

- Tools you build will be used by pilots, operators and engineers every single week.

- **Get to participate in flight tests** on the airbase — see the systems you build run on a real aircraft.

- Exposure to a modern stack and a genuine fast-paced startup environment.

- **Potential opportunity to continue full-time** after the internship.

- 100% reimbursement of public transport pass (Navigo) or €800/year for sustainable commuting.

- Bike provided for commuting.

- Free lunch.

- Bi-annual offsite trips with the whole team.

- Excellent work environment: international team, team events, beautiful offices on a former airbase - flights happening right outside the window.

Why You Should Join

**Founder Mentality:** We value ownership and people who enjoy building, solving problems, and making things happen quickly.

**Ground Floor Opportunity:** You'll help shape the internal platform that lets HyLight scale to inspecting millions of kilometers of energy infrastructure per year.

**Impact & Learning:** Work side-by-side with experts in embedded systems, aerospace, and data platforms - where your impact matters from day one.

Interview Process

1. Introductory phone call (30 min)

2. Take home work

3. Technical discussion

4. On-site meeting with the team

Location

Office: **Base 217, Brétigny-sur-Orge** , accessible via RER C. Lab and warehouse access.