Senior Staff Mobile Engineer – React Native Technical Leader for arenaflex’s AI‑Powered Chat Platform

About arenaflex – Pioneering AI‑Driven Mobile Experiences

arenaflex is a fast‑growing technology company dedicated to making artificial intelligence ubiquitous, open, and accessible to developers and end‑users worldwide. Our flagship AI models power a suite of innovative products, including a multilingual conversational app that showcases the capabilities of our large‑language‑model technology. With a distributed team spanning France, the United Kingdom, and the United States, arenaflex blends a startup‑spirit with deep technical expertise to deliver world‑class mobile experiences that delight millions of users.

In just the first two weeks after launch, our chat application recorded over a million downloads, proving the appetite for seamless, AI‑enhanced communication. As we scale this momentum, we need a visionary mobile engineer who can shape the next generation of our product, set technical standards, and mentor a high‑performing engineering team.

Why Join arenaflex?

• Impact at Scale: Your work will directly influence a product already enjoyed by a massive, global audience.
• Cutting‑Edge Technology: Build on top of state‑of‑the‑art AI models, integrating natural‑language understanding and generation into a mobile‑first experience.
• Ownership & Influence: As a Staff Engineer you will own end‑to‑end product delivery, from concept to production, and shape the architectural roadmap.
• Growth‑Focused Culture: arenaflex invests heavily in continuous learning, conference attendance, and internal knowledge‑sharing.
• Diverse, Inclusive Teams: We champion a low‑ego, collaborative environment where every voice is valued.

Key Responsibilities

• Craft and Innovate: Lead the design, development, and launch of new mobile features in collaboration with the mobile lead, ensuring they are user‑centric and technically robust.
• Cross‑Functional Synergy: Partner closely with product managers, UI/UX designers, data scientists, and backend engineers to translate product visions into performant mobile solutions.
• Performance Excellence: Optimize application responsiveness, memory usage, and battery consumption across iOS and Android, delivering a seamless experience for millions of daily users.
• Problem Solver: Proactively identify, diagnose, and resolve performance bottlene‑points, crashes, and edge‑case bugs before they affect users.
• Code Quality Champion: Drive rigorous code‑review practices, implement comprehensive unit and integration test suites, and champion automation in CI/CD pipelines.
• Thought Leader: Stay ahead of mobile‑development trends (e.g., new React Native releases, architectural patterns, native bridge innovations) and disseminate insights across the organization.
• Mentor and Guide: Elevate the capabilities of junior and mid‑level engineers through pair‑programming, workshops, and a culture of constructive feedback.
• End‑to‑End Ownership: Own the full software development lifecycle for key features, from requirements gathering and prototyping through release monitoring and post‑launch iteration.

Essential Qualifications

• 7+ years of professional software development experience, with at least 4 years dedicated to mobile engineering using React Native.
• Demonstrated track record of shipping high‑quality, consumer‑facing mobile applications in a B2C context.
• Deep sense of consumer experience and UI/UX design principles; ability to critique and improve user flows.
• Previous experience in a Staff‑level or senior technical leadership role, preferably within a startup or fast‑paced environment.
• Strong autonomous work ethic—self‑starter who can drive initiatives from idea to delivery with minimal supervision.
• Excellent problem‑solving, decision‑making, and communication skills, both written and verbal.

Preferred Qualifications & Additional Skills

• Experience with web development (frontend frameworks such as React) to facilitate cross‑platform consistency.
• Hands‑on involvement with AI‑centric products, especially those leveraging large language models or on‑device inference.
• Familiarity with native iOS (Swift/Objective‑C) and Android (Kotlin/Java) codebases for bridging complex functionality.
• Knowledge of performance profiling tools (e.g., Flipper, Xcode Instruments, Android Profiler) and best practices for mobile analytics.
• Experience establishing and evolving CI/CD pipelines for mobile (e.g., Fastlane, Bitrise, GitHub Actions).

Core Skills & Competencies for Success

• Technical Mastery: Expertise in React Native architecture, Redux/MobX state management, native module integration, and OTA update strategies.
• Architectural Vision: Ability to design scalable, modular, and testable codebases that accommodate rapid feature iteration.
• Collaboration: Strong partnership mindset, comfortable working with product, design, data, and backend teams.
• Mentorship: Proven ability to coach engineers, foster a growth mindset, and build technical depth across the team.
• Customer Obsession: Deep empathy for end‑users, translating feedback into concrete product improvements.
• Adaptability: Thrive in an environment where priorities shift quickly, and new challenges emerge daily.

Career Growth & Learning Opportunities

At arenaflex, your career trajectory is limited only by your ambition. As a Staff Engineer you will be positioned to:

• Transition into a Principal or Architect role, influencing platform‑wide decisions.
• Lead cross‑functional squads, shaping product strategy beyond the mobile domain.
• Access a generous education budget for conferences, certifications, and advanced AI or mobile courses.
• Participate in internal hack weeks and innovation programs, where ideas can become new product lines.
• Receive mentorship from senior leadership with deep expertise in AI, product design, and scaling global tech businesses.

Work Environment & Culture at arenaflex

arenaflex nurtures a vibrant, low‑ego, high‑energy culture that celebrates curiosity and creativity. Our offices in Paris, London, and remote‑first locations provide:

• Flexible working hours and a hybrid remote model that respects work‑life balance.
• Transparent communication channels; weekly all‑hands, quarterly product demos, and open‑door leadership.
• Regular team‑building events, virtual coffee chats, and a shared commitment to diversity and inclusion.
• Dedicated “focus days” free from meetings to deepen technical work.

Compensation, Perks & Benefits

We offer a market‑competitive cash salary, equity participation, and a comprehensive benefits package that varies by region. Highlights include:

• France: Competitive salary, equity, daily lunch vouchers, monthly contribution toward a personal fitness membership (formerly known as Gympass), mobility pass subsidy, full family health insurance, generous parental leave, and visa sponsorship when needed.
• United Kingdom: Competitive salary, equity, health insurance, reimbursement for office parking or £90/month public‑transport allowance, £90/month fitness membership reimbursement, and a SmartPension‑style retirement plan (5% employee contribution, 3% employer contribution).
• Global remote‑work equipment stipend, professional development budget, and access to the latest AI research resources.

Hiring Process – What to Expect

• Recruiter Screening (45 min): Introduction to arenaflex, discussion of your background, and alignment on role expectations.
• Hiring Manager Interview (30 min): Deep‑dive into your mobile experience, technical leadership style, and cultural fit.
• Live‑Coding Session (60 min): Real‑time problem solving on a mobile‑relevant challenge using React Native.
• System Design Interview (60 min): Architect a scalable mobile feature or service, exploring trade‑offs and design patterns.
• Culture‑Fit Discussion (30 min): Exploration of your values, teamwork approach, and long‑term aspirations.

How to Apply

If you are excited to shape the future of AI‑powered mobile communication and thrive in a dynamic, high‑impact environment, we want to hear from you. Submit your resume, a brief cover letter highlighting your most relevant achievements, and any code samples or portfolio links that demonstrate your expertise.

Join arenaflex and leave your imprint on a product that is already changing how millions converse across the globe.