AI SOFTWARE ENGINEER (SENIOR/STAFF LEVEL)
Station F
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Descripción de la vacante
Joko is an AI shopping app expanding globally with a strong focus on the US. This remote-friendly role contributes to building the AI agent powering J Uno, the shopping assistant, across Paris, Barcelona, and New York.
You will own agent architecture, evaluation, and scalability, collaborating with product, data, and frontend teams to ship reliable AI features for millions of users.
Formación
- 5+ years of software engineering with production systems.
- Experience building AI systems used by real users.
- Familiar with agentic frameworks and evaluation tooling (LangChain, LangFuse).
- Strong code quality, testing, and ownership.
- English fluency and collaborative mindset.
Responsabilidades
- Own the architecture of the agentic system and push boundaries.
- Design evaluation frameworks and monitor AI performance.
- Expand tools and capabilities for AI, catalog lookups and searches.
- Ingest, standardize, and enrich large product data at scale.
- Leverage signals to personalize user experience and intent.
- Prototype new features and iterate with users based on feedback.
Conocimientos
Herramientas
Descripción del empleo
Joko is an AI shopping app that helps millions of users save time and money when shopping online or in-store. With Juno, our shopping assistant, they can find the right product at the best price in only a few seconds.
What sets Joko’s AI apart is how well it knows its users. Its shopping recommendations feel personal from day one and get sharper the more they use it. It draws on unique assets to deliver the best experience: one of the largest product catalogs in the world, and unique shopping data no one else has to personalize every recommendation.
Users can also track the price of their favorite products and earn cash back almost everywhere. All in one free app.
Joko is a tech company founded in Paris. Their team of 120+ talents is international and spread across Paris, Barcelona, and New York, with some working remotely.
As a certified B Corporation, they are committed to making a difference for the communities they serve, including the 6 million consumers already using Joko to save money every day at over 10,000 merchants.
After reaching profitability in their core market, they are expanding internationally with a primary focus on the US.
It’s still day 1 at Joko; come build the future of shopping with us.
At Joko, our mission is to help consumers save time and money when shopping online or in-store.
Founded in Paris, Joko is a tech company and certified B Corp with over 120 talents across Paris, Barcelona, and New York (and beyond). More than 7 million users already save money every day at 10,000+ merchants with Joko.
From cashback and automatic coupons to price alerts, we’ve kept expanding our products to make shopping smarter. Today, Joko is an AI shopping app: with Juno, our shopping assistant, users can find the right product at the best price in only a few seconds, with recommendations that get sharper the more they use it.
Having reached profitability in our core market, we’re now scaling globally, with a strong focus on the US.
This position is remote-friendly (France and Spain).
Our Engineering team excels at solving cutting-edge technical challenges with elegant solutions. With a strong focus on product innovation and design, they are shaping the future of the online shopping experience. Their ambition is to have a positive impact on the everyday lives of hundreds of millions of users around the world.
Software Engineers in the Engineering team work hand-in-hand with the Product team, from exploration, design, and roadmap prioritization to implementation, and deployment in production. At Joko, we have firsthand experience that teams with engineers who possess a diverse range of skills, and where engineering and product collaborate closely, are able to deliver a truly delightful and innovative user experience.
The Engineering team is currently growing fast to continuously innovate on all parts of our product and tech stack and to empower the revolution of the way people shop online.
- Agent architecture: You will own the architecture of our agentic system — ensuring it constantly evolves, incorporates the latest advancements in the field, challenges existing assumptions, tests bold ideas, and pushes the boundaries of what our AI assistant can do.
- Evaluation & monitoring: You will design and run robust evaluation frameworks to measure Joko AI's performance, catch regressions, and build confidence before shipping to production.
- Capabilities & integrations: You will constantly expand the set of tools and capabilities that Joko AI can leverage — web search, vector search, ever-smarter catalog lookups — making the agent more resourceful, faster, and more reliable at scale.
- Catalog & data at scale: Great recommendations start with great data. Joko AI is powered by a product catalog of hundreds of millions of entries, continuously updated. You will tackle the massive challenges of ingesting, standardizing, and enriching this data at scale, where AI itself plays a key role.
- Personalization: Joko has access to uniquely rich data — bank transactions and browsing behavior through the browser extensions — giving us unparalleled insight into user preferences and shopping patterns. You will leverage these signals to deeply understand user intent and build a truly personalized experience — making Joko AI feel like it genuinely knows what you’re looking for.
- Experimentation & prototyping: You will constantly push Joko AI forward by identifying new challenges and building new features for the agent. You will prototype fast, put early versions in users' hands, and iterate based on real feedback
- Staying ahead: You will stay on top of the latest models, agentic frameworks, and research papers, and translate what's emerging into concrete improvements for Joko AI.
- Fine-tuning & optimization: You will fine-tune models to improve quality, reduce latency, and cut costs — always with a production-grade mindset.
- Runtime & scalability: You will iterate on the backbone and infrastructure Joko AI runs on, ensuring it handles hundreds of thousands of daily users with zero downtime and minimal latency.
- Product collaboration: We are inventing an entirely new shopping experience with Joko AI — and much of what the ideal UX looks like is still to be defined. You will work hand-in-hand with the Product team, exploring bold design directions, imagining what the future of AI-assisted shopping can be, and turning that vision into reality from early concept to full rollout.
- Experience: You have 5+ years of software engineering experience, including time building and shipping production systems. You've operated at a senior or staff level and you're used to owning ambitious projects from design to production.
- Track record: You've ideally built production AI systems that real users rely on, and you care deeply about code quality, separation of concerns, and testing.
- Technical skills: You are deeply familiar with agentic frameworks (LangChain, LangGraph, or equivalents), LLM observability tools (LangFuse or equivalents), LLM APIs, and evaluation tooling for AI systems. An AI/ML background or degree is a strong plus, but not a blocker.
- Builder's mindset: You love building from scratch. You are not precious about your ideas — you ship, test, learn, and iterate fast.
- Full-stack spirit: You are comfortable going from AI logic to infrastructure to frontend prototyping when needed. You don't stop at your lane.
- Fast learner: The AI landscape moves fast. You thrive in it. You follow the research, experiment with new models and tools, and you are always slightly ahead of the curve.
- Problem solver: You approach hard technical problems methodically. Latency, cost, hallucinations, long-term memory — you know these challenges and you enjoy tackling them.
- Team player: You work closely with Product, iterate with users, and communicate clearly about what's working and what isn't.
- Drive & ownership: You take full ownership of your scope. You don't wait to be asked — you spot issues, propose solutions, and ship.
- Language: You are fluent in English (written and spoken).
- Mindset: You have an entrepreneurial mindset, you like challenges, you welcome feedback and you love constantly learning and getting better.
- Flexible remote: If you live in Paris, you can choose to work from our office or from home with no constraints. If you live elsewhere, we can provide access to a coworking space and a coworking budget.
- Work from anywhere: Want to spend a month in Italy while working? You can work from most countries in the world for up to 3 months per year.
- Top-market compensation
- Equity for everyone with the chance to own a piece of what you build
- Half-day each week dedicated to leveling up with AI by exploring new tools, iterating hard, and sharpening your skills
- Yearly offsite in amazing locations and budget for team-building events & monthly in-person gatherings
- Contribution to your ClassPass subscription
- 8-week leave paid 100% for the second parent
- …and much more, check the full list here!
- Intro call: Quick screening with the Hiring Manager or the Talent team.
- Step 1 – Team interview (45 min): Conversation with two Joko team members (could include the Hiring Manager, people from the team you'd join, or colleagues from other teams).
- Step 2 – Role-specific assessments
- For non-engineering roles: A take-home case study followed by a 45-min interview. We assess both your output and how you think in real time. The exercise will be relevant to your role (e.g. analysis, strategy, or process design).
- For engineering roles: A 90-min live technical interview on CoderPad covering code understanding, review, system design, and product thinking (with AI serving as a collaboration tool).
- Step 3 – Leadership interview (45 min): Conversation with a SteerCo member and a Founder.
- References: Up to 3 calls with former colleagues or managers.
You may also be invited for coffee with team members to get a feel for our culture.
- Contract Type: Full-Time
- Location: Paris, Barcelona
- Possible full remote
- Salary: between 76300€ and 174600€ / year
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