At a Glance
- Tasks: Lead the development of a high-performance React Native app for a thriving fashion marketplace.
- Company: Join a fast-growing, AI-driven marketplace backed by top-tier investors.
- Benefits: Competitive salary, remote work options, and opportunities for professional growth.
- Other info: Join an AI-first culture with excellent career advancement opportunities.
- Why this job: Make a real impact in a hyper-growth startup while shaping mobile standards.
- 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 employer: Jack & Jill
Joinfleek.com is an exceptional employer, offering a dynamic and innovative work environment in the heart of London. As a Senior Mobile Engineer, you will have the opportunity to shape the mobile experience of a rapidly growing AI-driven marketplace, backed by leading investors like a16z and Y Combinator. With a strong focus on employee growth, cutting-edge technology, and a collaborative culture, Fleek empowers its team members to make impactful contributions while enjoying the benefits of a high-performance workplace.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Mobile Engineer (React Native) AI-Driven Marketplace
✨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
Show off your skills! Create a portfolio or GitHub repo showcasing your React Native projects. We want to see what you can do, so make it easy for potential employers to check out your work.
✨Tip Number 3
Prepare for interviews by practicing common questions and coding challenges. We recommend doing mock interviews with friends or using platforms that simulate real interview scenarios to boost your confidence.
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen. Plus, we love seeing candidates who are proactive about their job search!
We think you need these skills to ace Senior Mobile Engineer (React Native) AI-Driven Marketplace
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 past projects, especially in e-commerce or marketplace settings. Don't just list your skills; tell us how you've made an impact!
Be Product-Minded:We love engineers who think like product managers! In your application, share examples of how you've connected technical decisions to business outcomes. Show us that you understand the bigger picture and can drive results.
Keep It Relevant:Tailor your application to the role. Focus on your experience with mobile performance optimisation and A/B testing. We want to know how you've improved user experiences and conversion rates in your previous roles.
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you don’t miss out on any important updates. Plus, we love seeing candidates who take that extra step!
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've optimised mobile performance and created high-quality user experiences. They’ll want to see that you can not only code but also understand the nuances of mobile development.
✨Showcase Your AI Knowledge
Since this role involves integrating AI-driven features, be prepared to talk about your experience with AI tools like Cursor or Copilot. Share specific examples of how you've used these technologies in previous projects and how they impacted the end product. This will demonstrate your ability to connect technical skills with commercial outcomes.
✨Prepare for Technical Challenges
Expect to face some technical challenges during the interview. Practice coding problems related to mobile app development and be ready to explain your thought process. They might ask you to solve a problem on the spot, so keep your cool and think aloud to show your problem-solving approach.
✨Understand the Marketplace Landscape
Familiarise yourself with the e-commerce and secondhand fashion marketplace landscape. Research their competitors and trends in the industry. Being able to discuss how you can contribute to their growth and what unique insights you bring will set you apart from other candidates.
