Senior Full-Stack Engineer – Product & UX

Senior Full-Stack Engineer – Product & UXParis · Permanent contract · HybridBuild the experience after the clickAt 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 teamYou will join our Perfect User Journey squad, led by Ioanna, our Engineering Team Lead.The squad currently includes:One Front-End EngineerOne Full-Stack EngineerJulie, who leads Product for the squadYou 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 missionsBuild features end-to-endYou 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.Improve high-impact user journeysOur 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 measureOur 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:ConversionRevenueReliability and quality of critical user journeysUX improvements and validated learningWork closely with Product and BusinessYou 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 profile8+ years of software engineering experience, ideally in product-led environmentsStrong expertise in React and TypeScript / JavaScriptProven experience building and scaling user-facing web productsSolid understanding of web performance, front-end architecture and responsive experiencesStrong UX sensitivity, with the ability to identify friction, challenge existing journeys and propose improvements without detailed designsEnough back-end autonomy to build and deliver complete features end-to-endComfortable working with APIs and backend services; Python experience is highly valuedA data-driven and experimental mindset, using evidence to validate decisions rather than relying solely on intuitionProactive and comfortable with ambiguity, with the ability to move forward without detailed specificationsStrong product and business awareness, with an interest in outcomes beyond technical implementationA pragmatic approach to engineering: knowing when to build for the long term and when an effective 80/20 solution is enoughComfortable working in a small, multidisciplinary team where Engineers actively contribute to product decisionsClear and reliable communication with both technical and non-technical stakeholdersFluent French and EnglishWe 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 haveExperience in a recognised product company or scale-upExperience working on high-traffic B2C journeys, landing pages or mobile web productsHands-on experience with A/B testing, product analytics, CRO or usability testingExposure to growth, marketing, conversion or acquisitionExperience with voice AI, telephony or call-center productsExperience using AI-assisted development tools, such as Claude CodeAn entrepreneurial background or experience in an early-stage environmentOur stackFront endReactTypeScript / JavaScriptGatsbyBack endPythonFlaskMicroservicesData and storageMongoDBRedisMySQLDynamoDBLookerInfrastructure and deliveryAWSCircleCIAI-assisted developmentClaude CodeYou 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.Benefits🤗 SideCare health insurance, fully covered by Dolead💳 Lunch Voucher: Swile lunchcard - 13€/day - 50% coverage by Dolead🌴 Holidays: 25 vacation days & 8 RTT💻 Flexible remote policy: 2 days/week in office(depending on the team organization)🌍 Multiculturual environment: +13 nationalities represented🥳 Strong company culture, monthly team & company events!📍 Offices: Located in the center of Paris (near Opéra)Recruitment processAn initial conversation with Florian, our Talent Acquisition ManagerA discovery interview with Ioanna and a member of the Engineering teamA technical and product working session covering problem-solving, UX thinking, implementation and testingA final conversation with Vlad, our CPTOReference checks before the offerWe 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.