Senior Product Manager in Whitehall

We're looking for a builder‐PM to own a product area at Fonoa end‐to‐end, from problem to prototype to ship. As a Senior PM at Fonoa, you'll prototype, test with customers, and build the commercial case before asking engineering to commit resources. You'll work directly with engineers, GTM teams, and tax subject matter experts to close the loop between what the market needs and what ships. Generating code is no longer the bottleneck. The constraint is judgement – what should be built, in what order, validated with whom – and this is a seat for someone who treats that as their job.

The role spans the full product loop: identifying problems through customer proximity and GTM signal, building working prototypes in tools like Base44, Lovable, or Cursor, testing with customers and SMEs, making the commercial case, and partnering with engineering to ship and iterate. The standard is show it, don't describe it.

This is a senior IC role on a small, high‐calibre Product team at the core of the company – hands‐on building, no people management. We're looking for someone who can prototype on Monday, test with a customer on Wednesday, and ship by Friday.

• Own a product area end‐to‐end. Take full accountability for a defined product remit – from identifying the problem to shipping the solution and validating it with customers.
• Prototype before you brief. Build working prototypes using low‐code and AI‐assisted tools before engineering resources are committed. Test with customers and SMEs early.
• Stay close to customers. Listen to Gong calls. Spend time with customers. Bring signal into product decisions directly from conversations you've personally had, not from second‐hand reports.
• Build the commercial case. Make the internal case for investment: what to build, why, for whom, and what the business outcome is. Get alignment before engineering is engaged.
• Drive cross‐functional execution. Work directly with engineers, GTM, and tax SMEs. Create alignment yourself rather than waiting for process to deliver it.
• Ship and iterate. Partner with engineering to deliver, measure what shipped, and adjust.

• Builder credibility (non‐negotiable). You've personally built working product – not managed its build. You can pick up Base44, Lovable, Cursor, or equivalent and ship a prototype without waiting for engineering.
• Customer proximity by instinct. You've sat on customer calls and fed that signal directly into product decisions. You can describe a specific customer conversation that changed how you built something. You don't delegate customer contact.
• Commercial judgement. You can articulate why a specific thing should be built now, for whom, and what the business outcome is. You've made the business case for what you shipped – not had someone else make it for you.
• Enterprise product experience. You've shipped products for enterprise buyers – complex organisations, multi‐threaded stakeholders, long sales cycles. You understand the difference between what a champion wants and what a CFO will approve.
• Pace under ambiguity. You've operated where the product surface wasn't well‐defined and the right answer wasn't obvious. You've made calls, been wrong, adjusted fast, and moved on.
• Cross‐functional influence without authority. You've aligned engineering, GTM, and domain experts on direction without a mandate. You can point to a specific moment where you personally moved a cross‐functional decision forward.
• AI in your own workflow. You use AI tools actively in how you work as a PM – not just talk about how AI shows up in product. You have a view on how the role itself is changing.
• High‐growth experience. You've operated in a company growing fast, where the PM function was being built rather than maintained.

About Fonoa: At Fonoa, we are transforming how digital‐first companies stay tax compliant. We provide simple and modular API solutions that easily integrate into any existing workflow. Through our technology‐first approach, we reduce manual processes, increase compliance and reduce the cost of operations when transacting and scaling internationally. We are solving one of the largest yet unsolved problems in global e‐commerce. Our tax automation software enables companies such as Uber, Zoom & Booking.com to expand their international offerings more quickly and remain tax‐compliant.