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Tech Lead – New Cross-Platform Mobile App

Our client is embarking on a strategic rebuild of their core mobile experience — this time, modular, scalable, and cross-platform.

The existing mobile app, built in 2014, no longer meets today’s needs. The new app will be a key pillar in the client’s digital strategy and will be owned and developed across multiple internal teams. There are no prototypes yet, and no tech stack selected — you’ll help lead these foundational choices. Customer is not simply rebuilding the old. This is a brand-new use case with broader reach and bigger goals.

Your Mission

As an Tech Lead, you will:

  • Guide and mentor internal tech leads across mobile and platform teams.
  • Play a critical role in technology decision-making (hybrid vs. pure cross-platform), supported by strong documentation.
  • Shape and co-design a modular architecture owned by multiple feature teams.
  • Lay the foundation for a loosely coupled, highly aligned system.
  • Ensure scalability and a future-proof design.
  • Act as a long-term partner: from architecture to prototyping to launch and beyond.

Project Timeline

  • H2 2025: Project kick-off
  • Dec 2025: Architecture and groundwork complete
  • Summer 2026: First prototype release (internal at least)

Team Setup You’ll be working alongside:

  • Product Leads
  • Designers
  • Backend, Web, Android, and iOS developers
  • Internal Tech Leads
  • And you — the external Tech Lead, bringing direction and expertise to unify it all.

What We’re Looking For

  • Strong hands-on experience in cross-platform mobile (React Native, Flutter, etc.) in large multi-team environments
  • Solid understanding of modular app structures and ownership models
  • Proven consulting experience in large-scale cross-platform mobile projects
  • Ability to document and drive technology decisions
  • Background in architecting scalable systems
  • Fluent in English; Finnish is a plus
  • Availability to work onsite occasionally in the Helsinki Metropolitan Area

Details:

  • Location: Finland (preferred), hybrid/onsite in Helsinki occasionally
  • Allocation: 100%
  • Start: H2/2025
  • Language: English
  • Duration: Long-term

More information: juho_witted // juho.sopanen@witted.com

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