Paris, France - On-site 4 days per week

About

We’re Massive Dynamic. Our mission is to automate marketing. The first step is to build the best copilot for digital advertisers and help hundreds of thousands of operators globally focus on creativity and strategy instead of getting bogged down in repetitive tasks.

We were founded by Trystan (CEO) and Guillaume (CTO). We have deep experience in paid marketing and shipping great products used daily by millions. We just raised a pre-seed round led by Seedcamp.

A few super concrete pointers about our culture and hiring philosophy:

• We’re small and flat.
• We’re committed to excellence and prioritize talent density over short-term growth.
• We’re co-located. Everyone comes to the office at least 4 days per week.
• We grind: we exchange early/ late texts and sometimes work over weekends.
• We pay way above market and give big incentives for success.
• We’re into Lean principles - not scrum BS - we focus maniacally on 1/ making value flow to customers, 2/ eliminating waste, and 3/ nurturing growth in people.

Role

As Design Engineer, you own the end-to-end experience—from concept to pixel-perfect code. You work directly with the founding team to craft and ship the interfaces that define our product. You think like a designer, build like an engineer, and obsess over details that create moments of delight.

You'll:

• Shape the product vision — Partner with engineering and go-to-market teams to identify high-impact opportunities, scope what's feasible, and push the boundaries of what users expect.
• Design and prototype rapidly — Move from rough concepts to interactive prototypes, iterating based on user feedback and technical constraints.
• Ship production UI — Code React components, implement layouts, and build interactions that feel fast and natural.
• Own quality bar — Set and maintain exceptional standards for visual polish, interaction design, and performance across the entire product.