```html 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. ``` Apply for this job