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Twelve

Lead Frontend Developer

Twelve
United Kingdom · Full-time · Mid-Senior

About the Company

An exciting opportunity to work for a stealth startup backed by a highly successful founder. This innovative B2C mobile product leverages AI to revolutionize personal growth, transforming long-form content into hyper-personalized, bite-sized audio experiences.


About the Role

We are seeking a highly autonomous and experienced Lead Front-End Engineer with deep expertise in React Native. This isn't just about coding; it's about leading, innovating, and significantly impacting product direction from day one.


Responsibilities

  • Lead the development of the consumer-facing mobile application using React Native, focusing on creating delightful user experiences, smooth animations, reliable offline functionality, and top-tier performance.
  • Drive rapid product iteration, moving quickly from concept to deployment, measuring results, and deciding whether to expand or refine features.
  • Act as a mentor to other front-end engineers and contribute to core architectural decisions.
  • Proactively propose new ideas, challenge assumptions, and influence the product roadmap with a strong product mindset.
  • Comfortably navigate backend systems (Node/TypeScript, Python AI pipelines) and infrastructure (Google Cloud, Airflow) to ensure smooth operations and unblock development.


Qualifications

  • 5+ years of experience building and launching B2C mobile products, ideally within an early-stage startup environment.


Required Skills

  • Deep proficiency in React Native and TypeScript, with comfort in incorporating native code when necessary.
  • Proven track record of taking initiative, making sound judgments, and adapting quickly in a dynamic environment.
  • Experience leading or mentoring junior developers through code reviews and design sessions.
  • Familiarity with our stack: React Native, TypeScript, Python (AI), Node, Postgres, GCP, Terraform.


Preferred Skills

  • Direct collaboration and mentorship from the founder and senior technical advisors.
  • Significant autonomy and the chance to shape the product from an early stage.
  • Be part of a well-funded startup with a strong runway and ambitious growth plans.
  • Opportunity for immersion sprints in Silicon Valley.
  • A flexible hybrid work structure and a culture that prioritises impact over bureaucracy.


Pay range and compensation package

If you're a builder who thrives in a fast-paced, innovative environment and is passionate about personal growth and mobile technology, we want to hear from you! Apply now to learn more about this transformative role!

Key Skills

Ranked by relevance

react native react ai typescript python cloud gcp
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Posted
Jul 08, 2025
Type
Full-time
Level
Mid-Senior
Location
London Area
Company
Twelve

Industries

Broadcast Media Production Distribution

Categories

Information Technology

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