Freelance - Senior Data Solution Engineer

Started in France in 2016, MyTraffic’s mission is to empower commerce professionals with the best location analytics and insights to make smarter decisions every day and design the best experiences in physical locations.
We already serve more than 500 customers across multiple sectors — Retail, Real Estate, Cities, and Electric Vehicles (EV Connect) — all over Europe, helping them expand their businesses, analyze or predict investment performance, better understand customer behaviors, and benchmark results against competitors.
Backed by a €30M Series B fundraising round in November 2022 and strengthened by the strategic acquisition of Geoblink in January 2024, Mytraffic has become Europe’s leading location intelligence platform.2026 will be a pivotal moment for Mytraffic. Joining us now means being part of a major transformation, as we launch an AI-powered product and redefine our go-to-market strategy around a strong Product-Led Growth approach.

Job Description
Our Custom Solutions team builds what our most demanding clients cannot get from the platform alone, and it runs out of capacity exactly when demand peaks. We are bringing in a freelance Solution Engineer for a 4 to 5 month mission to own custom data projects end-to-end through our busiest season.
Concretely, you unlock projects we would otherwise have to turn down, with around 2 client projects delivered per month, from qualifying the need to presenting the results back to the client. Your analyses feed the strategic decisions of retail, food & beverage, real estate and public sector leaders in France and Spain, on mobility data nobody else has.
You also free up the team’s senior capacity for our shift to Gini, our AI-powered product. High ownership, clear deliverables, no bureaucracy.
About our team :You join the Custom Solutions team (Professional Services), 6 people between Paris and Spain, reporting to Mathurin. Day-to-day you work with Custom Team, the two Senior Solution Engineers who carry delivery, and closely with the Account Executives, Product and Data teams. The team is senior and autonomous, everyone owns their projects from the first client call to the final restitution and ships client-facing work every week.
To give you more details about your day-to-day at MyTraffic :Own around 2 custom client projects per month, end-to-end, from needs qualification to final restitutionBuild the deliverables yourself, in Python (pandas) notebooks, SmartDash dashboards, mockups and SQL (BigQuery / Snowflake)Qualify client needs with our Account Executives and turn them into a scoped, sellable analysisModel where depth is required, from footfall to performance forecasting, to sharpen the recommendationPresent results directly to clients, handle their questions live, and turn feedback into next stepsMaster our data ecosystem, how each source is produced, what it can answer and what it cannotDocument each project and hand it over cleanly, so the work outlives the missionShare insights with the Product team to make the platform absorb tomorrow what is custom todayAbout you :Hard skills3+ years in a technical or solution engineering role in a SaaS company, delivering analyses or custom solutions to external clientsStrong Python (pandas) and SQL, you build a complete analysis on large datasets without supportComfortable building predictive models (forecasting) and turning them into a business recommendationAble to produce client-ready outputs, dashboards, mockups and restitution decksSpanish and English fluent (required), French is a plusFreelance status with your own company structure, based in Barcelona or Madrid, available for a full-time mission of 4 to 5 months starting ASAPSoft skillsClient communication, you make a complex analysis simple and hold your own on questions and objectionsAutonomy and business sense, you challenge your own results before showing them to a clientOwnership, you carry a project from conception to handover without being chasedAgility, you run several fast-paced projects in parallel and re-prioritise without dramaFast learner and team player, you plug into a small remote squad and document as you goWhat

we offer
Joining our scale-up means:Attractive package, around 450€/daily, invoiced monthly over a 4 to 5 month missionTailored support – A context pack and a senior team to ramp you up fast on our data and our clientsA real impact – Your projects feed the strategic decisions of Europe’s leading retail and real estate playersA culture of innovation – Thrive in an environment that values creativity and ambition, as we launch our AI-powered productFlexibility – Fully remote from Barcelona or Madrid, with our offices open to you and regular syncs with the Paris teamThe Recruitment ProcessFreelance profiles get booked fast, so we run a lean process, less than 1.5 weeks end-to-end.30 min with our Talent Acquisition Manager – availability, day rate, location, languages, motivation60 min business case with the Senior Solution Engineers –