Senior Backend Product Engineer, Fyxer.AI

Typescript/Node.js

£120-140k

+ Equity

SQL

AWS

TypeScript

GCP

Azure

BigQuery

Firestore

Zoom

Senior and Expert level

London

4 days a week in office (Holborn, London)

AI executive assistant

Open for applications

AI executive assistant

21-100 employees

B2CB2BArtificial IntelligenceInternal toolsProductivity

Open for applications

£120-140k

+ Equity

SQL

AWS

TypeScript

GCP

Azure

BigQuery

Firestore

Zoom

Senior and Expert level

London

4 days a week in office (Holborn, London)

21-100 employees

B2CB2BArtificial IntelligenceInternal toolsProductivity

Company mission

To offer executives a holistic service rather than a single employee and EA’s flexible and remote working.

Job

Company

Role

Who you are

6+ years experience working as a backend engineer in a startup or high-growth environment
Expert-level fluency in TypeScript, including server-side development
Solid experience with Google Cloud Platform or similar (e.g. AWS, Azure)
Built scalable systems using Cloud Functions, PubSub, Firestore, Cloud Storage, etc
Confident writing SQL (BigQuery or equivalent) and building data flows that scale
Comfortable owning infrastructure and CI/CD (we use GitHub Actions + GCP)
Product mindset you care about what you're building and why it matters
Experience with AI or high interest in AI-powered productivity tools would be ideal
Intensity, urgency, and high standards for your work

What the job involves

At Fyxer, "Product Engineer" means you’re not just writing backend endpoints you’re building products. You’ll look at usage data, talk to customers, and design elegant solutions with real impact
You’ll work closely with Matt (CTO) and the engineering team to scale and evolve our backend systems as we grow to tens of thousands of users
Expect to own high-leverage features across everything from core architecture to AI workflows to observability
Design and scale backend infrastructure to handle millions of user actions per day
Build real-time processing pipelines for email, calendar, and Zoom data
Own integrations with external APIs (Google, Microsoft, OpenAI)
Collaborate on product direction, usage insights, and user experience
Drive performance, reliability, and observability across our cloud functions and services
Make key decisions around architecture, data modelling, and tooling
Reports to: Matt, Cofounder & CTO

Application process

Submit your CV (no cover letter needed)
20-min intro call
Live coding interview (45 mins)
Backend/product case study (45 mins)
Meet the team over lunch in our Holborn office

Salary benchmarks

Our take

Fyxer AI delivers AI executive assistants that can organize 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.

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 - a sure-fire sign of the value users see in its offering.

Steph

Company Specialist at Welcome to the Jungle

Company

Funding (2 rounds)

Mar 2025

$10m

SERIES A

Aug 2024

$0.5m

EARLY VC

Total funding: $10.5m

Company HQ

Alamo Square, San Francisco, CA

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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