---
title: 'Staff Software Engineer at Hexa'
canonical: 'https://feeny.ai/job/staff-software-engineer-hexa-paris-2fj7mj9e7v7c'
type: 'job'
last_seen: '2026-10-18'
---

# Staff Software Engineer at Hexa

- **Company:** Hexa
- **Location:** Paris, France
- **Employment:** full-time
- **Posted:** 2026-10-13
- **Last confirmed live:** 2026-10-18
- **Apply:** https://jobs.ashbyhq.com/hexa/e38bbeed-f8d9-4776-8239-b9a26227db96

## Job description

## About Pelagon

Pelagon is a European defence technology company building Autonomous Maritime Interdiction systems. We bring together sensing, AI, software and maritime engineering to help protect critical infrastructure and maritime environments.

## The role

We are looking for a very senior, hands-on software engineer to own the software running in Pelagon’s operations centre: our data infrastructure, processing services, internal tools and customer-facing applications. You will architect the overall platform and build it with the team, from data ingestion and storage to machine-learning workloads, operational applications and deployment. You will be the technical interface between our embedded systems and AI teams, bringing their work together into a coherent, reliable system. This role requires depth across software development, data engineering and DevOps. Our software must run on infrastructure operated by Pelagon or our customers, including self-hosted and on-premises environments. Robustness, operability and cybersecurity must be designed into the system from the outset.

## What you will own

- Software architecture and delivery. Define the architecture of our core services, APIs, internal tools and customer-facing applications. Make and document technical decisions, write production code and take responsibility for the system from design through operation.
- Data infrastructure at scale. Build reliable ingestion, storage and retrieval for large volumes of sensor and operational data. Choose and operate databases and storage systems, design data models, and manage data quality, migrations, retention and performance.
- Processing and machine-learning workflows. Build the infrastructure to schedule, execute and monitor data-processing and ML jobs. Handle dependencies, resource allocation, retries, reproducibility and failure recovery, working closely with the AI team to bring its workloads into production.
- Deployment on infrastructure we control. Make the platform reproducibly deployable on Pelagon and customer infrastructure. Own infrastructure automation, software packaging, configuration, release pipelines, upgrades and rollback without depending on managed cloud services.
- Reliability and operations. Establish observability, performance testing, capacity planning, backup and recovery. Diagnose production issues and build systems that recover predictably from interrupted connectivity, partial failures and faulty inputs.
- Cybersecurity throughout the lifecycle. Build security into architecture, implementation, deployment and maintenance. Apply threat modelling, least-privilege access, authentication and authorisation, network isolation, secrets management, encryption and audit logging. Establish secure development practices, dependency and vulnerability management, patching and incident readiness.
- Integration across teams. Define clear interfaces and data contracts with the embedded systems and AI teams. Own integration and end-to-end testing so devices, data pipelines, algorithms and applications operate as one system.
- Engineering effectiveness. Set a high standard for code, testing, documentation and technical judgement. Mentor engineers and use AI-assisted development tools effectively to accelerate implementation, testing and investigation, while retaining rigorous review, security checks and control over sensitive code and data.

## What you bring

- Extensive experience building and operating robust, data-intensive production software, with architectural ownership across multiple components and teams.
- Strong hands-on software development skills, with the ability to move from system design to implementation and difficult production debugging.
- Deep experience with data ingestion, databases, storage systems and distributed processing, including the practical challenges of performance, consistency and scale.
- A strong DevOps and systems background: Linux, networking, containers, orchestration, infrastructure as code and automated delivery.
- Proven experience deploying and maintaining software on self-managed infrastructure, private infrastructure or customer premises, including operating the services that managed cloud platforms would otherwise provide.
- Experience building or operating job orchestration and data-processing platforms, and integrating ML workloads into production systems.
- Practical cybersecurity expertise and a record of applying it to production software and infrastructure. You can identify threats, make security trade-offs explicit and implement effective controls.
- The judgement to choose maintainable solutions, anticipate failure modes and balance delivery speed with long-term reliability.
- The ability to lead technically across disciplines, clarify ambiguous requirements and take ownership of the overall outcome.
- Effective use of modern AI engineering tools, with the discipline to verify generated code and protect confidential information.

Useful experience

- Sensor, time-series, streaming or geospatial data.
- Compute-intensive workloads, GPU infrastructure or ML platform engineering.
- Enterprise software deployed across multiple customer environments.
- Systems with demanding availability, security or connectivity constraints.
- Operator-facing applications and software connected to physical systems.

## Why this role

You will have substantial ownership of the software foundation behind Pelagon’s operations, working directly with the founders, embedded systems engineers and AI team. Your architectural decisions and the code you ship will shape how the complete system is deployed, secured and operated. We value demonstrated ownership: what you built, how it performed at scale, how you secured it and what you learned from operating it.

## About Hexa

## Company Overview
- **One-liner**: Hexa is a multi-stage startup studio that partners with founders to build, launch, and scale software companies from scratch.
- **Entity Type**: Private (multi-stage startup studio; operates Start, Sprint, and Scale tracks)
- **Headquarters**: Paris, France (12 rue Martel 75010)
- **Founded**: 2011
- **Founders**: Not publicly listed as a single founder; built as a studio by a founding team.

## Core Business
- Primary industry/industries: Venture Building / Startup Studio / Company Creation
- Target customers: Aspiring and experienced entrepreneurs (B2B, B2C, Enterprise tech founders)
- Mission or purpose statement: "To build alongside founders, not from the sidelines" – creating companies that leave a mark on the world by combining hands-on operational support with capital.

## Products & Services
- **Hexa Start**: A 12-month, intensive program for entrepreneurs who want to build a company from scratch (often before they have a concrete idea). Hexa provides the idea, team, co-founder, and covers all costs until the company becomes independent.
- **Hexa Sprint**: A 6-month program for founding teams who already have an idea and are looking for their first check (pre-seed). Offers €500k (€20k convertible note for 4% + €480k convertible note with MFN & cap at €8M).
- **Hexa Scale**: A growth-stage program for post-product-market-fit companies ($1–10M ARR, 10–40% YoY growth). Hexa invests €5–20M per company, takes a majority stake, and provides hands-on operational support (GTM, product, AI strategy, international expansion, hiring) for 9–12 months.
- **In-house Expertise**: 30+ experts in Product Design, Product Management, Engineering (via hired teams), GTM, Sales, Marketing, Finance, Legal, People & Talent, Comms & Brand, Community, and Investing.

## Market Standing
- **Valuation/Market Cap**: Combined valuation of launched companies exceeds **$5 billion**.
- **Key Metric**: **50+ companies launched**; **2,600+ employees** across portfolio companies; **12 exits**.
- **Notable Investors/Partners**: Not explicitly listed on the site, but the studio itself acts as the primary investor and operator. Portfolio includes multiple billion-dollar companies (names not publicly listed in the provided data).
- **Growth Signals**: Studio has been operating since 2011 and has scaled from 0 to 50+ companies. The addition of the Scale track indicates a pivot to later-stage growth. Receives ~1,000 founder applications per year, selecting ~12 founders (2 per project) annually for the Start track.

## Competitive Advantages
- **Hands-on, not hands-off**: Unlike traditional accelerators or VCs, Hexa provides a full in-house team of operators (product, design, GTM, legal, finance) working alongside founders for 12 months (Start) or 9–12 months (Scale).
- **Founder-friendly majority stake**: For Scale, Hexa takes a majority stake but claims to be "the world’s most founder-friendly majority investor" – founders remain in the driver's seat with active board support.
- **Proven track record**: 50+ companies, $5B combined valuation, 12 exits, spanning 12+ years of SaaS expertise.
- **End-to-end platform**: Covers the entire lifecycle from idea (Start) to pre-seed (Sprint) to growth (Scale) – rare in the startup studio space.
- **Built-in network & resources**: Founders get immediate access to a team of 30+ experts, legal, finance, recruiting, and a community of other founders.

## Strategic Focus
- **Scaling the Scale track**: The newer Hexa Scale program is a key growth driver, targeting profitable, capital-efficient B2B SaaS companies with $1–10M ARR.
- **AI & embedded finance**: Hexa Scale explicitly helps companies with AI strategy and adding fintech/embedded finance capabilities.
- **International expansion**: Helping portfolio companies expand into new geographies and verticals.
- **Maintaining high selectivity**: Keeping the Start track highly curated (~12 founders/year) to ensure deep support and quality outcomes.

## Why Work Here
- **Culture**: "You'll never build alone" – the studio emphasizes deep collaboration, ambition, humility, and execution. The team is composed of entrepreneurs and expert operators.
- **Remote/Hybrid Policy**: Hexa is based in Paris. For the Start track, a presence at HQ is important to benefit from resources and mentorship. Sprint is remote-friendly but based in France/Europe for events. Scale is likely remote-friendly with in-person board/partner meetings.
- **Perks & Engineering Culture**: No software engineers in the core team – each startup's product is built by engineers recruited specifically for that company. This means engineers get to join a funded startup with a built-in support system from day one. The studio provides legal, finance, recruiting, and strategic support so engineers can focus on product.
- **Career Path**: Two kinds of roles: (1) the core team that builds the machine (partners, product managers, designers, GTM, finance, legal) and (2) founding hires inside the startups coming out of the studio. Either way, you're in "before it exists" – a high-risk, high-reward environment with significant ownership and impact.

## Sources
1. [hexa.com](https://www.hexa.com/)
2. [hexa.com/positions](https://www.hexa.com/positions)
3. [jobs.ashbyhq.com/hexa](https://jobs.ashbyhq.com/hexa)
4. [hexa.com/team](https://www.hexa.com/team)
5. [hexa.com/faq](https://www.hexa.com/faq)

## Other roles at Hexa

- [Field Application Engineer](https://feeny.ai/job/field-application-engineer-hexa-paris-jc9jeae7k86b) — Paris, France
- [Investment Associate @Hexa Scale](https://feeny.ai/job/investment-associate-hexa-scale-hexa-paris-ewx0msmj3x8p) — Paris, France
- [Embedded System Lead Engineer](https://feeny.ai/job/embedded-system-lead-engineer-hexa-france-2yyg4mg11fp9) — France
- [Founding Sales @Hodor (backed by Hexa)](https://feeny.ai/job/founding-sales-hodor-backed-by-hexa-hexa-paris-2wryb04trbv8) — Paris, France
- [Founder Associate Intern @Verso (backed by Hexa)](https://feeny.ai/job/founder-associate-intern-verso-backed-by-hexa-hexa-paris-ttwa96ehk668) — Paris, France
- [Founder Associate Intern](https://feeny.ai/job/founder-associate-intern-hexa-paris-6vbwskw7ck51) — Paris, France
- [Founding sales lead](https://feeny.ai/job/founding-sales-lead-hexa-paris-99zxdh5wra2p) — Paris, France
- [VC Analyst - Internship](https://feeny.ai/job/vc-analyst-internship-hexa-paris-y542ejwvvn0k) — Paris, France
- [Expert Assurance | Courtage & IA @Panora (backed by Hexa)](https://feeny.ai/job/expert-assurance-courtage-ia-panora-backed-by-hexa-hexa-paris-13vyhp18z9qb) — Paris, France
- [Office and Event Manager](https://feeny.ai/job/office-and-event-manager-hexa-paris-brn9tf9jj5gw) — Paris, France