Founding Fullstack Engineer

Posted 7 Days Ago
Be an Early Applicant
Paris, Île-de-France, FRA
In-Office
Entry level
Software
The Role
As a Founding Fullstack Engineer, you'll design and scale AI systems, owning infrastructure and product end-to-end while optimizing for performance, costs, and reliability.
Summary Generated by Built In

Verso is building the Consumer Intelligence OS.

We replace traditional qualitative research agencies with an AI-native platform that conducts, analyzes, and compounds consumer conversations at scale. Instead of one-off studies, companies get a continuous, structured understanding of their customers.

Our ambition is to make consumer insight a real-time, always-on system embedded in every product and marketing decision.

We’re starting with AI-moderated interviews — but this is just the entry point. The long-term product is a system of record for consumer understanding, powered by agentic workflows.

Backed by Hexa (eFounders), behind Aircall, Front, Spendesk, Yousign and 50+ others.

Verso is founded by an experienced team with a strong track record in strategy, technology, and company building.

Lydia - CEO: HEC graduate, 7 years at BCG (Principal), expert in strategy, innovation, and consumer goods

Camille - CTO: Dual degree X/HEC, former lead at CO2 AI, expert in AI and scalable product development

The role

You will join Verso as a Founding Engineer to own systems end-to-end → from infrastructure to product, with no strict boundaries — and help define engineering standards, observability, and the foundations of the team.

You will design and scale a coherent AI system end-to-end, at the intersection of agents, data, and product:

  • An AI interviewer interacting with users at scale (voice & video), sustaining long-form conversations with high reliability

  • Agent systems (state, memory, evaluation loops) orchestrating complex interactions

  • Real-time and async pipelines transforming multimodal data (video, audio, text) into structured, actionable insights

  • A client platform to explore these insights through an AI-native interface

  • Data systems to structure, query, and reuse qualitative knowledge at scale

  • Optimization of latency, cost, and performance across LLM, TTS, STT

  • Reliability of long-running AI workflows in production

What makes this role unique
  • You will build production-grade AI systems, not prototypes

  • You will work on long-form, high-stakes interactions, not short prompts

  • You will design systems where AI quality is as critical as system reliability

  • You will operate at the intersection of AI, data, infrastructure, and product

Current stack
  • Frontend: TypeScript, React, Tailwind, shadcn

  • Backend: Python, FastAPI, SQLAlchemy

  • Infra: Vercel, Railway, Supabase → AWS

  • AI: LLM orchestration, STT/TTS pipelines, eval systems (rapidly evolving)

Note: no need to necessarily master Python and Typescript, your coding agents do 😉

What we’re looking for

  • You want to build production-grade AI systems on messy, real-world data — not demos

  • You’re comfortable owning systems end-to-end, from architecture to production

  • You have experience with complex systems (real-time, data pipelines, or LLM-based products)

  • You have strong intuition for trade-offs (latency, cost, quality, reliability)

  • You’re motivated by building an ambitious, category-defining company with long-term ownership - not just execution.

Why join

  • Category-defining shift: we’re not improving research workflows — we’re turning consumer understanding into a continuous system

  • Hard technical problems: production AI systems over rich, unstructured data (audio, video, text, structured), spanning both a B2C product (low latency, high scale, responsiveness) and a B2B platform (enterprise-grade reliability, security, and data integrity).

  • Full ownership: you’ll own architecture, product, and execution from day one, with direct impact on the company trajectory.

  • Meaningful equity: early-stage package with strong upside, aligned with long-term value creation (next fundraise in the coming months).

  • Hexa environment: operate within a top-tier startup studio, with access to talent, resources, and a strong builder ecosystem.


Verso is committed to creating a diverse environment. All qualified applicants will receive consideration for employment irrespective of gender, origin, identity, background, and sexual orientation.

We know there’s a long way to go regarding diversity in our industry, which is why we encourage all applicants - especially those listed above - to apply to our open positions.

Top Skills

AWS
Fastapi
Llm Orchestration
Python
Railway
React
Shadcn
Sqlalchemy
Stt
Supabase
Tailwind
Tts
Typescript
Vercel
Am I A Good Fit?
beta
Get Personalized Job Insights.
Our AI-powered fit analysis compares your resume with a job listing so you know if your skills & experience align.

The Company
Brussels
78 Employees
Year Founded: 2011

What We Do

Hexa is a startup studio. It all started in 2011 with startup studio eFounders, which pioneered a new way of entrepreneurship, became a reference in the B2B SaaS world, and launched over 50 companies including 3 unicorns (Front, Aircall, Spendesk). In 2022, eFounders became Hexa, to scale our ambitions further and launch startups in new verticals: AI, web3, fintech, future of work, health. With Hexa, we’re on a mission to democratize a new way for entrepreneurship, one centered around building companies in teams. In numbers? We’re an entrepreneurial ecosystem made up of: - +40 companies launched - +2800 jobs created - 3 unicorns (Spendesk, Aircall, Front) - +$4.5 billion combined companies valuation

Similar Jobs

In-Office
Paris, Île-de-France, FRA
78 Employees

CryptoNext Security Logo CryptoNext Security

Senior Full-stack Engineer

Information Technology • Security
In-Office
Paris, Île-de-France, FRA
28 Employees

Silverfort Logo Silverfort

Marketing Manager

Information Technology • Sales • Security • Cybersecurity • Automation
Remote or Hybrid
Paris, Île-de-France, FRA
507 Employees

Zscaler Logo Zscaler

Senior Sales Engineer

Cloud • Information Technology • Security • Software • Cybersecurity
Easy Apply
Remote or Hybrid
France
8697 Employees

Similar Companies Hiring

Milestone Systems Thumbnail
Software • Security • Other • Big Data Analytics • Artificial Intelligence • Analytics
Lake Oswego, OR
1500 Employees
Fairly Even Thumbnail
Hardware • Other • Robotics • Sales • Software • Hospitality
New York, NY
30 Employees
Kepler  Thumbnail
Fintech • Software
New York, New York
6 Employees

Sign up now Access later

Create Free Account

Please log in or sign up to report this job.

Create Free Account