Senior Full-Stack Engineer – Product & Experimentation

Dolead; Paris; On-site; EUR 85,000 - 120,000; Full time

Job summary

DOLEAD SAS in Paris is seeking a Senior Full-Stack Engineer to join the Product & Experimentation squad. You will design and build features across the stack, from React interfaces to Python services, while shaping how users move from click to contact.

This hybrid, permanent role invites you to own end-to-end journeys, collaborate with Product, Data and Architecture, and drive measurable improvements through experiments and data analysis.

Qualifications

• Strong front-end experience with React
• Full-stack feature design and delivery
• Ability to work with data and experimentation
• Proficiency with Python services
• Hybrid Paris-based role for a permanent contract

Responsibilities

• Design and develop features across the stack (React to Python services)
• Improve high-impact user journeys and performance
• Run experiments, measure impact with data and inform decisions
• Contribute to architectural discussions and product direction

Skills

React

Python

Full-stack

Experimentation

Performance

Job description

Senior Full-Stack Engineer – Product & Experimentation
Paris · Permanent contract · Hybrid
Build the experience after the click

At Dolead, we help companies turn digital acquisition into measurable business results.

Today, millions of users interact with the landing pages and digital journeys we build across Europe and the United States. Our next challenge is to go further.

We want to create a seamless experience from the moment someone clicks on an ad to the moment they are contacted by one of our clients’ call centers: clearer next steps, better follow-up, smarter interactions and, eventually, new experiences powered by AI.

To help us build this, we are looking for a Senior Full-Stack Engineer with a strong interest in user experience, product thinking and experimentation.

This is not a role where Engineering receives a finished roadmap and simply executes it. You will help shape the problems we solve, challenge the solutions and measure whether what we build actually moves the needle.

Your team

You will join our Perfect User Journey squad, managed by Ioanna, the team’s Engineering Lead.

• one Squad Lead
• one Front-End Engineer;
• one Full-Stack Engineer;
• But you'll also talk to Product, Data and Architecture

You will become the third Engineer in the team and work closely with all of them to design, build and improve our user journeys.

The squad is deliberately small and cross-functional. Product, Engineering and Business work closely together, with short decision loops and a shared focus on measurable outcomes.

What you will do

Build product features end-to-end

You will design and develop features across the stack, from React interfaces to the Python services supporting them.

While the role requires strong front-end expertise, you should also be comfortable taking ownership of the back-end components needed to deliver a complete feature.

Improve high-impact user journeys

Our landing pages are currently the main product area for the squad.

You will work on their architecture, performance and user experience, while helping us progressively extend the journey beyond the initial conversion.

The longer-term ambition is to connect the online experience with what happens afterwards: qualification, follow-up and interactions with call centers.

Experiment, measure and scale

We do not build features based on intuition alone.

You will work with Product and Business to turn ideas into testable hypotheses, launch experiments and analyse their impact using data.

Our approach is simple: PoC and Scale. Test quickly, measure honestly and invest further when the results justify it.

Your impact will primarily be assessed through:

• conversion;
• revenue;
• product and technical quality.

Contribute to technical decisions

Our stack may evolve over the coming years.

You will contribute to architectural discussions, challenge