Senior Full-Stack Engineer – Product & UX

Dolead; Le Chesnay-Rocquencourt; On-site; EUR 90,000 - 120,000; Full time

Benefits offered by this job

SideCare health insurance

Flexible remote policy

Company culture & events

Paris office

Job summary

Dolead is hiring a Senior Full-Stack Engineer with strong front-end expertise and a passion for UX, product and experimentation. You will design and implement features end-to-end, from React interfaces to Python services, collaborating with Product and Business to improve journeys and conversions.

You will join the Perfect User Journey squad in a small, cross-functional team with rapid decision loops. The role emphasizes frontend strength, while backend autonomy and data-driven decisions are

Qualifications

• 8+ years of software engineering experience.
• Proven track record building and scaling web products.
• Strong frontend with React expertise and UX focus.
• Backend autonomy to ship features end-to-end; Python preferred.
• Fluent in French and English; good stakeholder communication.
• Data-driven, experimental mindset; comfortable with CRO concepts.

Responsibilities

• Build features end-to-end across the stack, from React interfaces to Python services.
• Contribute to technical decisions and trade-offs for speed, quality and maintainability.
• Collaborate with Product and Business to understand user problems and drive outcomes.
• Improve landing pages, architecture, performance and UX for the customer journey.
• Prototype, test, measure impact and iterate using data-driven insights.

Skills

8+ yrs exp

Web products

Web performance

UX sensitivity

Backend autonomy

APIs & Python

Data-driven mindset

Stakeholder comms

French & English

80/20 pragmatism

Tools

React

Gatsby

Python

Flask

Microservices

Job description

Build the experience after the click

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

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: 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.

To help us build this, we are looking for a Senior Full-Stack Engineer with strong front-end expertise and a real sensitivity to UX, product and experimentation.

This is not a role where Engineering receives detailed specifications and simply executes them.

You will work closely with Product and Business to understand user problems, challenge existing journeys, propose solutions, test them and measure their impact.

Your team

You will join our Perfect User Journey squad, led by Ioanna, our Engineering Team Lead.

The squad currently includes:

• One Front-End Engineer
• Julie, who leads Product for the squad

You will become the third Engineer in the team.

The squad is small and cross-functional, with short decision loops and close collaboration between Engineering, Product and Business.

Your missions

Build features end-to-end

• You will design and develop features across the stack, from React interfaces to the Python services supporting them.
• The role is clearly front-heavy, but we expect you to be autonomous enough on the back end to deliver complete features end-to-end.
• You will also contribute to technical decisions and help the team make pragmatic trade-offs between speed, quality and long-term maintainability.
• Our landing pages are currently the main product area for the squad.
• You will work on their architecture, performance and user experience, while progressively extending the journey beyond the initial conversion: qualification, follow-up and interactions with call centers.
• We are looking for someone who can spot friction, challenge existing flows and propose simpler experiences without waiting for detailed designs.
• A large part of our traffic is mobile web, so responsive behaviour and usability on smaller screens are particularly important.

Experiment, test and measure

• Our approach is simple: PoC and Scale.
• You will turn ideas into hypotheses, build prototypes, instrument user interactions and test whether those ideas actually improve the experience.
• You do not need to come from a formal CRO or experimentation background, but you should be comfortable using data to validate decisions and iterate quickly.

Your impact will mainly be measured through:

• Conversion
• Revenue
• Reliability and quality of critical user journeys
• UX improvements and validated learning

Work closely with Product and Business

• You will work directly with Product and Business to understand user behaviour, business constraints and priorities.
• We expect you to actively contribute to the discussion, challenge assumptions and occasionally take the lead on specific problems or initiatives.

Your profile

• 8+ years of software engineering experience, ideally in product-led environments
• Proven experience building and scaling user-facing web products
• Solid understanding of web performance, front-end architecture and responsive experiences
• Strong UX sensitivity, with the ability to identify friction, challenge existing journeys and propose improvements without detailed designs
• Enough back-end autonomy to build and deliver complete features end-to-end
• Comfortable working with APIs and backend services; Python experience is highly valued
• A data-driven and experimental mindset, using evidence to validate decisions rather than relying solely on intuition
• Proactive and comfortable with ambiguity, with the ability to move forward without detailed specifications
• Strong product and business awareness, with an interest in outcomes beyond technical implementation
• A pragmatic approach to engineering: knowing when to build for the long term and when an effective 80/20 solution is enough
• Comfortable working in a small, multidisciplinary team where Engineers actively contribute to product decisions
• Clear and reliable communication with both technical and non-technical stakeholders
• Fluent French and English

We care more about what you have built, the problems you have solved and how you think than the name of your school or your exact academic background.

Nice to have

• Experience in a recognised product company or scale-up
• Experience working on high-traffic B2C journeys, landing pages or mobile web products
• Hands-on experience with A/B testing, product analytics, CRO or usability testing
• Exposure to growth, marketing, conversion or acquisition
• Experience with voice AI, telephony or call-center products
• Experience using AI-assisted development tools, such as Claude Code
• An entrepreneurial background or experience in an early-stage environment

Our stack

• React
• Gatsby
• Python
• Flask
• Microservices

Data and storage

• MongoDB
• Redis
• MySQL
• DynamoDB
• Looker

Infrastructure and delivery

• AWS
• CircleCI

You do not need to have worked with every part of the stack already. Strong engineering fundamentals, strong front-end skills and the ability to learn quickly matter more than ticking every box.

SideCare health insurance, fully covered by Dolead

Flexible remote policy: 2 days/week in office (depending on the team organization)

Strong company culture, monthly team & company events!

Offices: Located in the center of Paris (near Opéra)

Recruitment process

• An initial conversation with Florian, our Talent Acquisition Manager
• A discovery interview with Ioanna and a member of the Engineering team
• A technical and product working session covering problem-solving, UX thinking, implementation and testing
• A final conversation with Vlad, our CPTO
• Reference checks before the offer

We aim to keep the process transparent and useful on both sides. You will know what each step is designed to assess and have the opportunity to meet the people you would work with.

Dolead is an equal-opportunity employer. We welcome applicants from all backgrounds and make hiring decisions based on skills, experience and potential.