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 :

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Own around 2 custom client projects per month, end-to-end, from needs qualification to final restitution

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Build the deliverables yourself, in Python (pandas) notebooks, SmartDash dashboards, mockups and SQL (BigQuery / Snowflake)

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Qualify client needs with our Account Executives and turn them into a scoped, sellable analysis

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Model where depth is required, from footfall to performance forecasting, to sharpen the recommendation

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Present results directly to clients, handle their questions live, and turn feedback into next steps

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Master our data ecosystem, how each source is produced, what it can answer and what it cannot

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Document each project and hand it over cleanly, so the work outlives the mission

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Share insights with the Product team to make the platform absorb tomorrow what is custom today

🫵 About you :
🛠️ Hard skills

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3+ years in a technical or solution engineering role in a SaaS company, delivering analyses or custom solutions to external clients

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Strong Python (pandas) and SQL, you build a complete analysis on large datasets without support

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Comfortable building predictive models (forecasting) and turning them into a business recommendation

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Able to produce client-ready outputs, dashboards, mockups and restitution decks

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Spanish and English fluent (required), French is a plus

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Freelance status with your own company structure, based in Barcelona or Madrid, available for a full-time mission of 4 to 5 months starting ASAP

🤝 Soft skills

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Client communication, you make a complex analysis simple and hold your own on questions and objections

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Autonomy and business sense, you challenge your own results before sho