Senior Fullstack Engineer - New Ventures (Paris or NY)

WeWard; Paris; Hybride; EUR 120 000 - 172 000; Plein temps

Avantages offerts par ce poste

Global team across Paris and NY

Remote up to 2 days/week

Learning & development budget

Central Paris office with amenities

Stock options available

Résumé du poste

WeWard in Paris and New York is seeking a Senior Fullstack Engineer to own AI-powered product initiatives. You’ll design, build and launch scalable mobile apps from scratch and shape the architectural foundations of this new venture.

You'll collaborate with founders and cross-functional teams to integrate LLMs and AI APIs, prototype quickly and ship MVPs to production, balancing speed with quality in a dynamic, mission-driven environment.

Qualifications

• 7+ years of software engineering experience with backend focus and scalable architectures.
• Built AI-powered applications and leveraged AI tools to accelerate development speed.
• Proficient with Python on the backend, AWS ecosystem familiarity, and React Native end-to-end.

Responsabilités

• Design, build and launch scalable mobile applications from scratch with AI.
• Own the technical architecture from MVP to production-ready products.
• Develop backend services and frontend components required to ship new products.
• Integrate LLMs, AI APIs and intelligent agents for great UX.
• Leverage AI-powered development tools to accelerate delivery.
• Prototype, test and iterate quickly based on user feedback.
• Collaborate with Product, Design and founders to turn ideas into products.
• Make technical choices aligned with existing stack for maintainability.
• Define long-term technical foundations for WeWard's new products.

Connaissances

Python

AWS

React Native

System design

AI integration

English fluency

Ownership

Outils

Expo

LLMs

AI APIs

Description du poste

At WeWard, we're on a mission to help millions of people live healthier lives through technology.

Since launching in 2019, we've grown one of the world's leading walking apps, with more than 30 million users across 29 countries.

Today, we're taking the next step: We're launching a new strategic initiative focused on new products. Our ambition is to build a portfolio of consumer apps built with AI.

We're looking for our first Senior Fullstack Engineer to help bring this vision to life.

About the role

Your mission and team:

As our first engineer dedicated to this initiative, you'll play a foundational role. You'll become part of the engineering organization led by our future CTO and help establish the technical foundations of this new business.

Working directly with Marie-Sophie, Chief of Staff, Yves and Tanguy, WeWard's co-founders, you’ll rapidly prototype, test and launch multiple applications over the coming months.

Your responsibilities will include:

• Design, build and launch scalable mobile applications from scratch with AI.
• Own the technical architecture from the very first MVP to production-ready products.
• Develop both backend services and the frontend components required to rapidly ship new products.
• Integrate LLMs, AI APIs and intelligent agents to create delightful user experiences.
• Leverage AI-powered development tools to dramatically accelerate software development.
• Prototype, test and iterate quickly based on user feedback.
• Work closely with Product, Design and the founders to turn ideas into successful products.
• Make technical choices that align with WeWard's existing stack, so that every product launched can be taken over, maintained and evolved by our internal teams.
• Help define the long-term technical foundations of WeWard's new products.

Our commitments

• SUCCEED — You’ll join a team of passionate people who share values of ambition and determination
• TRUST — We give you real autonomy, trusting you to reach your goals in your own way
• EXPLORE — You’ll grow in a culture that’s constantly evolving and curious about what’s next
• PROGRESS — We’ll support you through challenges, learn from mistakes, and move forward together
• SMILE — And every day, you’ll be part of a fun and positive environment where humor is always welcome

What we’re looking for

You’re the perfect match if…

• We're looking for a builder with a strong product and entrepreneurial mindset.
• You have 7+ years of software engineering experience, with deep expertise in backend development and scalable architectures. You've already built AI-powered applications and naturally leverage AI tools to dramatically increase your development speed.
• You’re proficient with Python on the backend, comfortable across the AWS ecosystem, and at ease with React Native, ideally Expo, to build polished cross-platform mobile applications end-to-end.
• You have a strong sense of scalability and know how to assess an existing stack, decide what to keep or evolve, and make pragmatic technical choices that support the broader product ecosystem over time.
• You thrive in fast-paced environments, enjoy shipping quickly, iterating based on user feedback, and taking ownership from architecture to production.
• Beyond your technical skills, you're fluent in English, pragmatic, business-oriented, and excited by the challenge of building new products from scratch.

If this sounds like you, apply — we’d love to meet you.

What we offer

In Paris:

• A global, mission-driven team with teammates in Paris, NY, London, Boston!
• A healthy work/life balance (we walk the talk)
• Annual learning & dev budget (you grow, we grow)
• Work-Life balance : work remotely up to 2 days per week
• (Really, really) Cool office in central Paris with snacks, a walking desk and a huge Wardy hanging around

--

In NY:

• Top tier earnings : dive into a role offering a competitive salary range, with bonuses and stock options
• Health insurance covered with Aetna (including Dental and Vision)
• Global work culture : at least one visit per year to get chances to work from our Paris office
• Work-Life balance : work remotely up to 2 days per week
• 25 days of PTO + federal holidays
• Commuter benefits : we utilize pre tax dollars that are deducted directly from your paycheck, allowing you to get to work with a little less effort
• 401k Plan : with a 2% employer match, 2 years graded vesting

Recruitment Timeline

• Business interview with Marie-Sophie and Yves
• Technical interview with Tanguy, your future manager
• Case study with Marie-Sophie, Tanguy, Yves as well as Charles and Surya, our Engineering Managers
• Office tour to meet other team members followed by the final decision

And if it’s a match… Welcome to the adventure!