At Joko, we help consumers shop smarter. Founded in Paris, Joko is a tech company and certified B Corp with over 90 talents across Paris, Barcelona, and New York (and beyond). We’re now building an AI‑powered shopping assistant to help users find the best products by price, quality, and impact.
Our engineering team 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. 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, can 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. You will tackle the massive challenges of ingesting, standardising, and enriching this data at scale, where AI itself plays a key role.




Personalisation: Joko has access to uniquely rich data — bank transactions and browsing behaviour 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 personalised experience — making Joko AI feel like it genuinely knows what you’re looking for.
Fine‑tuning & optimisation: 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 adecuado UX looks like is still to be defined. Track record: you have solid software engineering experience, ideally building production AI systems. You have shipped things that real users rely on, and you care deeply about code quality, separation of concerns, and testing.
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 thrive in it. Language: you are fluent in English (written and spoken).
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.
~ Yearly offsite in amazing locations and budget for team‑building events & monthly in‑person gatherings
~ The exercise will be relevant to the role (e.g. analysis, strategy, or process design).
Coding interview + System design interview
For research internships, an additional round may involve analysing and presenting a research paper

You may also be invited for coffee with team members to get a feel for our culture.
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📌 Senior Staff Software Engineer - Fully Remote (Barcelona)
🏢 Joko
📍 Barcelona