At a Glance
- Tasks: Own the reliability of our AI Email Assistant and ensure smooth operations.
- Company: Join Fyxer, a cutting-edge tech company revolutionising client-facing roles.
- Benefits: Competitive salary up to £120k, equity, and flexible work options.
- Other info: Be part of a small, exceptional team with rapid career growth opportunities.
- Why this job: Make a real impact on product reliability in a fast-paced environment.
- Qualifications: Expertise in TypeScript, cloud experience, and full-stack engineering skills.
The predicted salary is between 100000 - 120000 € per year.
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.
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.
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).
Senior Product Reliability Engineer employer: FYXER
Fyxer is an exceptional employer that fosters a dynamic and innovative work culture in the heart of London. With a focus on employee growth, you will have the opportunity to take ownership of critical infrastructure projects while collaborating with a small, dedicated team. The blend of competitive compensation, equity options, and a flexible work schedule, including remote Fridays, makes Fyxer an attractive place for professionals seeking meaningful and rewarding employment.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Product Reliability Engineer
✨Tip Number 1
Network like a pro! Reach out to folks in the industry, especially those at Fyxer or similar companies. A friendly chat can open doors and give you insights that a job description just can't.
✨Tip Number 2
Prepare for that live problem-solving session! Brush up on your TypeScript skills and be ready to showcase your cloud experience. Practise coding challenges to keep your mind sharp and confident.
✨Tip Number 3
Show your passion for reliability! During interviews, share examples of how you've tackled incidents in the past. Highlight your obsession with learning and improving systems—it's what Fyxer is all about!
✨Tip Number 4
Don't forget to apply through our website! It’s the best way to ensure your application gets the attention it deserves. Plus, we love seeing candidates who take that extra step!
We think you need these skills to ace Senior Product Reliability Engineer
Some tips for your application 🫡
Tailor Your CV:Make sure your CV is tailored to the Senior Product Reliability Engineer role. Highlight your TypeScript expertise, cloud experience, and any relevant projects that showcase your full-stack capabilities. We want to see how your skills align with what we're building at Fyxer!
Showcase Your Achievements:Don’t just list your responsibilities; showcase your achievements! If you've migrated systems or improved reliability in past roles, let us know. We love seeing concrete examples of how you've made a difference in your previous positions.
Be Ready for Problem Solving:During the interview process, we’ll dive into live problem-solving scenarios. Brush up on your troubleshooting skills and be prepared to discuss how you approach diagnosing and fixing issues. We’re looking for your thought process as much as the solution!
Apply Through Our Website:We encourage you to apply through our website for a smoother application process. It helps us keep track of your application and ensures you don’t miss out on any important updates. Plus, it’s super easy!
How to prepare for a job interview at FYXER
✨Know Your Tech Inside Out
Make sure you brush up on your TypeScript and cloud experience, especially with Google Cloud. Be ready to discuss specific projects where you've used these skills, particularly in diagnosing and fixing production incidents.
✨Showcase Your Problem-Solving Skills
During the live problem-solving session, think aloud as you tackle the challenges. This will not only demonstrate your technical prowess but also your thought process and how you approach complex issues.
✨Prepare for Real-World Scenarios
Fyxer is looking for someone who can handle real incidents. Prepare examples from your past experiences where you’ve successfully diagnosed and resolved failures, and how you prevented them from happening again.
✨Engage with the Team
During lunch with the product reliability team, be yourself! Ask questions about their current challenges and share your thoughts on reliability standards. This shows your genuine interest in the role and helps you connect with the team.
