Senior Product Engineer, Fyxer.AI

£120-140k

+ £120K – £140K Equity. We offer the highest cash and equity in London, up to £500k package!

TypeScript

Python

Senior and Expert level

London

More information about location

4-5 days a week in office

AI executive assistant

Posted today

AI executive assistant

21-100 employees

B2CB2BArtificial IntelligenceInternal toolsProductivity

Posted today

£120-140k

+ £120K – £140K Equity. We offer the highest cash and equity in London, up to £500k package!

TypeScript

Python

Senior and Expert level

London

More information about location

4-5 days a week in office

21-100 employees

B2CB2BArtificial IntelligenceInternal toolsProductivity

Company mission

Get back one hour every day. Begin your day with emails neatly organized, replies crafted to match your tone and crisp notes from every meeting.

Job

Company

Role

Who you are

5+ years of experience building and shipping production software, with deep expertise in Python or TypeScript and a track record of owning systems end-to-end
Hands-on experience with modern AI/ML tooling (LLMs, fine-tuning, RAG, embeddings, distributed training, inference optimisation, etc.) and proven ability to work directly with models in production
Strong product intuition and user-centric mindset, able to translate ambiguous problems into simple, high-impact product decisions without product managers
Startup-ready mindset: comfortable operating with extreme ownership, rapid iteration, and high autonomy within a small, elite technical team

What the job involves

We’re solving the biggest problem in modern work: email
And we’re doing it at the best possible time in history to solve it
Too many companies start out focused on what users love, then add bells and whistles no one needs, hide features behind paywalls, and lose sight of what made them great in the first place
We think the best user experiences come from focus
For us, that means AI-generated email drafts. We’re laser-focused on making them better over time, using context from your meetings, inbox, and messages, because that’s what matters most to our users
Unlike other startups, we’re a pure-play applied AI company, not a SaaS tool with AI bolted on. We use the best techniques, including fine-tuned open-source models, tool use, and retrieval-augmented generation. As a result, users send 53% of the drafts we generate
Team members own both product strategy (we have no product managers and no plans to add them) and the execution of that strategy
They decide when to bring in qualitative insights (interviews, surveys, etc.) or quantitative data, supported by our data engineering team
Our technical staff focus on:
Building an incredible product
Helping users find value and share
Training cutting-edge models
Developing scalable infrastructure

Salary benchmarks

Our take

Built with the intention of turning the burden of email drafting into a business's competitive edge, Fyxer AI delivers AI executive assistants that can organise inboxes, draft emails in the tone of voice of each user, and write "better-than-human" meeting notes. Plugging directly into Gmail, Outlook, Slack, Teams, Google Meet and Zoom, its service is simple to use without the need to grasp additional software.

Fyxer is especially useful for industries that spend large amounts of time composing emails. Think real estate, consultants and recruiters, all saving time through the pure-play AI software of Fyxer and its open-source AI models and retrieval augmented generation. The company claims that its customers send 53% of the email drafts generated on its platform.

As more and more professionals turn to AI to save them time in their everyday tasks, Fyxer AI's secure and streamlined service is sure to gain more attention. Things certainly look to be going well, as in 2024, the company raised $500K in just three weeks from existing customers and their networks. It also rocketed from $1m ARR to $22m in just 10 months in 2025 - a sure-fire sign of the value users see in its offering

Steph

Company Specialist at Welcome to the Jungle

Company

Funding (last 2 of 3 rounds)

Sep 2025

$30m

SERIES B

Mar 2025

$10m

SERIES A

Total funding: $40.5m

Company values

What do we value? We're very intentional about adding new people. We believe a small team of exceptional people working hard at a problem they care about will always outperform a larger, more unfocused team. That means you'll need to bring an intensity to this role that might not be expected at other companies but it also means you'll be fast-tracked into roles with greater responsibilities far earlier.

Company HQ

Midtown Manhattan, New York

Leadership

Archie Hollingsworth

(Co-Founder & CRO)

Founding Member of Pavilion. Co-founded FYXER, an Executive Assistant Agency, in 2016, and is now using that knowledge at Fyxer AI.

Matthew Ffrench

(Co-Founder & CTO)

Previoulsy co-founded and was CTO at Mercado. Was also Product Manager at Zopa.

Richard Hollingsworth

(Co-Founder & CEO)

Founding Member of AI Circle. Co-founded FYXER with Archie, and was a Quant Trader at Bull Moose Derivatives.

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