THE BASICS
This role pays up to £120k/year DOE + equity.
Reporting to: Founding Engineer, Josh Harrison.
Location: Chancery Lane, London — Mon–Thu in office, Fri WFH.
What Are We Building
Fyxer is an AI Email and Meeting Assistant that eliminates admin burden for professionals in client‑facing roles. We use fine‑tuned open‑source models, tool use, and retrieval‑augmented generation.
THE ROLE
We’re hiring a Senior Product Reliability Engineer to sit within our platform team, a small, high‑ownership group responsible for the infrastructure and services that keep Fyxer running as we scale, including billing, integrations with third‑party apps, uptime and incident response.
This isn’t a ticket‑execution role. You’ll own the reliability standard for the whole company: what good infrastructure looks like, what it takes to ship safely, and how incidents get resolved and don’t repeat. You’ll work across the full stack, from cloud architecture to database migrations, using deep technical knowledge and sound judgement to keep a fast‑moving product on solid ground.
Past Achievements
- Migrated our billing structure in Stripe from a subscription model to usage‑based billing with zero downtime.
- Redesigned the entire webhook architecture behind our Outlook integration to eliminate rate limiting without downtime.
What You’ll Own
- Plan and execute infrastructure migrations that could crash the product.
- Diagnose, fix, and prevent recurring failures.
- Use quantitative data (error logs, cloud metrics) and qualitative data (support tickets, user reports) to identify the highest‑leverage reliability improvements.
- Build and maintain scripts, workflows, and cloud architecture; this is a full‑stack engineering role, not just tool configuration.
- Work closely with product engineers to review new features before they ship, ensuring they meet the reliability bar before production.
- Own the reliability standard across your product area, so new features and onboardings don’t break existing functionality.
What We’re Looking For
- Solid TypeScript expertise; essential for diagnosing and fixing production incidents.
- Serious cloud experience (Google Cloud or equivalent) with deep operational knowledge.
- Deep database knowledge, including design, justifying solutions.
- Production ownership; calm, fast, and preventive after incidents.
- Full‑stack capability to design and build features reliability‑wise.
- Genuine, self‑driven obsession with learning and technical craft.
We’re Deliberate About Hiring
A small team of exceptional people, working hard on a problem they care about, will always beat a larger, less focused team. That intensity means this isn’t a normal role, but it also means you’ll move faster than anywhere else. Josh Harrison joined as our founding engineer and now leads the platform team you’d be joining. He came because the problem was real and the team was exceptional, and the work is genuinely hard.
THE APPLICATION PROCESS
- Submit your CV — no cover letter needed.
- Personal interview with a team member (about 30 minutes).
- Live problem solving, remote (about 60 minutes).
- Coding challenge, take‑home task (about 60 minutes).
- Lunch with the whole product reliability team (about 60 minutes).
THE BASICS
This role pays up to £120k/year DOE + equity.
Reporting to: Founding Engineer, Josh Harrison.
Location: Chancery Lane, London — Mon–Thu in office, Fri WFH.
What Are We Building
Fyxer is an AI Email and Meeting Assistant that eliminates admin burden for professionals in client‑facing roles. We use fine‑tuned open‑source models, tool use, and retrieval‑augmented generation.
THE ROLE
We’re hiring a Senior Product Reliability Engineer to sit within our platform team, a small, high‑ownership group responsible for the infrastructure and services that keep Fyxer running as we scale, including billing, integrations with third‑party apps, uptime and incident response.
This isn’t a ticket‑execution role. You’ll own the reliability standard for the whole company: what good infrastructure looks like, what it takes to ship safely, and how incidents get resolved and don’t repeat. You’ll work across the full stack, from cloud architecture to database migrations, using deep technical knowledge and sound judgement to keep a fast‑moving product on solid ground.
Past Achievements
- Migrated our billing structure in Stripe from a subscription model to usage‑based billing with zero downtime.
- Redesigned the entire webhook architecture behind our Outlook integration to eliminate rate limiting without downtime.
What You’ll Own
- Plan and execute infrastructure migrations that could crash the product.
- Diagnose, fix, and prevent recurring failures.
- Use quantitative data (error logs, cloud metrics) and qualitative data (support tickets, user reports) to identify the highest‑leverage reliability improvements.
- Build and maintain scripts, workflows, and cloud architecture; this is a full‑stack engineering role, not just tool configuration.
- Work closely with product engineers to review new features before they ship, ensuring they meet the reliability bar before production.
- Own the reliability standard across your product area, so new features and onboardings don’t break existing functionality.
What We’re Looking For
- Solid TypeScript expertise; essential for diagnosing and fixing production incidents.
- Serious cloud experience (Google Cloud or equivalent) with deep operational knowledge.
- Deep database knowledge, including design, justifying solutions.
- Production ownership; calm, fast, and preventive after incidents.
- Full‑stack capability to design and build features reliability‑wise.
- Genuine, self‑driven obsession with learning and technical craft.
We’re Deliberate About Hiring
A small team of exceptional people, working hard on a problem they care about, will always beat a larger, less focused team. That intensity means this isn’t a normal role, but it also means you’ll move faster than anywhere else. Josh Harrison joined as our founding engineer and now leads the platform team you’d be joining. He came because the problem was real and the team was exceptional, and the work is genuinely hard.
THE APPLICATION PROCESS
- Submit your CV — no cover letter needed.
- Personal interview with a team member (about 30 minutes).
- Live problem solving, remote (about 60 minutes).
- Coding challenge, take‑home task (about 60 minutes).
- Lunch with the whole product reliability team (about 60 minutes).
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