At a Glance
- Tasks: Lead the development of a high-performance React Native app for a thriving fashion marketplace.
- Company: Joinfleek.com, a fast-growing startup backed by top-tier VCs like a16z and Y Combinator.
- Benefits: Competitive salary, dynamic work environment, and opportunities for professional growth.
- Other info: Join an AI-first culture and influence mobile standards across 70+ countries.
- Why this job: Make a real impact in a hyper-growth startup while working with cutting-edge AI technology.
- Qualifications: 4–10+ years in software engineering with expertise in React Native and e-commerce.
The predicted salary is between 80000 - 100000 £ per year.
Company Description: Joinfleek.com - Post-Series B marketplace backed by a16z and YC.
Location: London, UK
As a Senior/Staff Product Engineer, you will own the mobile experience for the world's fastest-growing wholesale secondhand fashion marketplace. Joining the London-based Demand team, you will build the primary interface used by 90% of buyers, integrating AI-driven classification into a seamless, high-performance React Native application that directly drives global GMV.
Why this role is remarkable:
- Direct ownership of the #1 revenue channel for a hyper‑growth startup tripling year‑on‑year with backing from top‑tier VCs like a16z and Y Combinator.
- High‑impact architectural influence where you define the mobile standards and experimentation layers for a marketplace disrupting a fragmented supply chain across 70+ countries.
- Work in an AI‑first engineering culture under leadership from Google and Postmates, utilizing cutting‑edge tools to solve complex inventory and discovery challenges.
What you will do:
- Lead the development of the core React Native application, focusing on high‑polish discovery, browsing, and purchasing flows that convert intent into transactions.
- Partner with data and AI teams to implement mobile surfaces for the FleekSort classification engine, making complex AI grading feel intuitive for users.
- Build and maintain a robust experimentation framework for A/B testing and analytics to drive data‑informed product decisions and optimize conversion rates.
The ideal candidate:
- 4–10+ years of professional software engineering experience with deep, production‑level expertise in React Native and mobile performance optimization.
- Proven track record in a fast‑paced consumer marketplace or e‑commerce environment where interaction quality and animation polish are treated as core features.
- Product‑minded engineer who leverages AI tools like Cursor or Copilot and connects technical trade‑offs to commercial outcomes rather than just following tickets.
Required Skills:
- E‑Commerce
- Software Engineering
- React Native
- Marketplaces
- Analytics
- A/B testing
Required Languages: English
Senior Mobile Engineer (React Native) AI-Driven Marketplace in London employer: Jack & Jill
Joinfleek.com is an exceptional employer, offering a dynamic work environment in the heart of London where innovation meets impact. As part of a rapidly growing team backed by leading investors, employees enjoy unparalleled opportunities for professional growth, a collaborative AI-first culture, and the chance to shape the future of the secondhand fashion marketplace. With a focus on high-performance engineering and a commitment to employee development, Joinfleek.com stands out as a rewarding place to build a meaningful career.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Mobile Engineer (React Native) AI-Driven Marketplace in London
✨Tip Number 1
Network like a pro! Reach out to folks in your industry on LinkedIn or at meetups. We all know that sometimes it’s not just what you know, but who you know that can get you in the door.
✨Tip Number 2
Prepare for those interviews! Research the company and its products, especially if they’re using tech like React Native. We want you to show them you’re not just another candidate, but someone who truly gets their mission.
✨Tip Number 3
Show off your skills! If you’ve got a portfolio or GitHub with projects that highlight your React Native expertise, make sure to share it. We love seeing what you can do in action!
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, we’re always on the lookout for passionate candidates who are ready to make an impact.
We think you need these skills to ace Senior Mobile Engineer (React Native) AI-Driven Marketplace in London
Some tips for your application 🫡
Show Off Your React Native Skills:Make sure to highlight your experience with React Native in your application. We want to see how you've used it in real projects, especially in e-commerce or marketplaces. Share specific examples that showcase your expertise and the impact of your work!
Be Product-Minded:We love engineers who think like product managers! In your application, connect your technical skills to commercial outcomes. Tell us how your work has improved user experiences or driven revenue in past roles. This will show us you understand the bigger picture.
Keep It Relevant and Concise:When writing your application, stick to what's relevant for the role. We appreciate clarity and brevity, so focus on your most impressive achievements and skills that align with our needs. Avoid fluff and get straight to the point!
Apply Through Our Website:Don't forget to apply through our website! It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it shows us you're keen on joining our team at Fleek!
How to prepare for a job interview at Jack & Jill
✨Know Your React Native Inside Out
Make sure you brush up on your React Native skills before the interview. Be ready to discuss your past projects, focusing on how you optimised mobile performance and enhanced user experience. They’ll want to see that you can not only code but also understand the nuances of building a high-performance application.
✨Showcase Your AI Knowledge
Since this role involves integrating AI-driven features, it’s crucial to demonstrate your understanding of AI tools and how they can enhance mobile applications. Prepare examples of how you've used AI in previous projects or how you envision it improving user interactions in a marketplace setting.
✨Prepare for Technical Challenges
Expect to face some technical challenges during the interview. Practice coding problems related to mobile development and be ready to explain your thought process. This is your chance to show off your problem-solving skills and how you approach complex issues in a fast-paced environment.
✨Understand the Business Impact
This role is all about connecting technical decisions to commercial outcomes. Be prepared to discuss how your engineering choices can drive revenue and improve user engagement. Showing that you think like a product-minded engineer will set you apart from other candidates.
