At a Glance
- Tasks: Own the reliability of our AI product, ensuring seamless performance and uptime.
- Company: Join Fyxer, a fast-growing AI company transforming email and meeting management.
- Benefits: Competitive salary up to £120k, equity, and flexible work options.
- Other info: Dynamic environment with opportunities for rapid career growth and learning.
- Why this job: Be part of an innovative team solving real-world problems with cutting-edge technology.
- Qualifications: Expertise in TypeScript, cloud platforms, and database design required.
The predicted salary is between 100000 - 120000 € per year.
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 understand your inbox, draft replies in your own voice, and take crisp meeting notes. We’re a pure‑play applied AI company, not a SaaS product with AI bolted on. We use fine‑tuned open‑source models, tool use, and retrieval‑augmented generation. Users send 53% of the email drafts we generate. Since launching in March 2024, we’ve grown from $0 to $30M+ ARR. We raised a $10M Series A and a $30M Series B in under 18 months.
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 taking ownership for 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.
Some examples of what the team has achieved in the past months:
- Migrated our billing structure in Stripe from a subscription model to usage‑based billing, from technical specification through to implementation, with zero downtime.
- Redesigned the entire webhook architecture behind our Outlook integration to completely eliminate rate limiting, changing a core part of the product without any downtime.
WHAT YOU’LL OWN
- Plan and execute infrastructure migrations, the kind where the wrong call takes the product down.
- Be the last line of defence when things break: diagnose it, fix it, and make sure it doesn’t happen again.
- Use quantitative data (error logs, cloud metrics) and qualitative data (support tickets, user reports) to identify the highest‑leverage reliability improvements.
- Build and maintain the scripts, workflows, and cloud architecture that the product runs on. This is a full‑stack engineering role, not just configuration of tools. You’ll ship code.
- Work closely with product engineers to review new features before they ship, ensuring they meet the reliability bar before they reach production.
- Own the reliability standard across your product area, so new features and onboardings don’t break what’s already working.
WHAT WE’RE LOOKING FOR
- The work in this role is what we call crunchy. Feature engineering is creative, there’s rarely one right answer. Product reliability engineering is different: there is a right answer, and you need to find it fast, with deep knowledge of how systems behave under pressure.
- Solid TypeScript. Expert level. If you don’t have this, you shouldn’t apply. You need to be fluent enough to diagnose and fix a production incident fast.
- Serious cloud experience. Google Cloud or equivalent, at depth. Deployments, scripts, GitHub workflows, operational tasks.
- Deep database knowledge. Not just querying, but designing. Understanding the database design options available and how to find the most effective solution.
- Production ownership. When something breaks, you’re the one who fixes it.
- Fullstack capability. You’ll be designing and building features alongside our product engineers.
- Genuine obsession with learning. We look for a deep, 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.
THE APPLICATION PROCESS
- Submit your CV — no cover letter needed.
- Personal interview with a team member (ca. 30 mins).
- Live problem solving, remote (60 mins).
- Coding Challenge, take‑home task (ca. 60 mins).
- Lunch with the whole product reliability team (60 mins).
If this sounds like the right next step, simply apply with a LinkedIn profile or CV.
Senior Product Reliability Engineer in London employer: Fyxer Limited
Fyxer is an exceptional employer, offering a dynamic work environment in the heart of London where innovation meets collaboration. With a strong focus on employee growth and a culture that values deep technical expertise, team members are empowered to take ownership of their projects while enjoying the flexibility of a hybrid work model. The opportunity to work alongside industry leaders and contribute to cutting-edge AI solutions makes Fyxer a truly rewarding place for those seeking meaningful and impactful careers.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Product Reliability Engineer in London
✨Tip Number 1
Network like a pro! Reach out to folks in your industry on LinkedIn or at meetups. A friendly chat can lead to opportunities that aren’t even advertised yet.
✨Tip Number 2
Prepare for those interviews! Research the company, understand their product, and think about how your skills can solve their problems. We want you to shine!
✨Tip Number 3
Show off your projects! If you've built something cool or solved a tricky problem, share it during interviews. It’s a great way to demonstrate your skills and passion.
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen. Plus, we love seeing candidates who are proactive about joining our team.
We think you need these skills to ace Senior Product Reliability Engineer in London
Some tips for your application 🫡
Keep it Relevant:When you're putting together your CV, make sure to highlight the skills and experiences that are most relevant to the Senior Product Reliability Engineer role. We want to see how your background aligns with what we're building at Fyxer.
Show Your Passion:We love seeing candidates who are genuinely excited about the work we do. In your application, let us know why you’re interested in Fyxer and how you can contribute to our mission of eliminating admin burdens for professionals.
Be Clear and Concise:While we appreciate detail, clarity is key! Make sure your CV is easy to read and gets straight to the point. We want to quickly understand your qualifications without sifting through unnecessary fluff.
Apply Through Our Website:Don’t forget to apply through our website! It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it makes the whole process smoother for everyone involved.
How to prepare for a job interview at Fyxer Limited
✨Know Your Tech Inside Out
Make sure you’re well-versed in TypeScript and cloud technologies, especially Google Cloud. Brush up on your database design skills too, as you'll need to demonstrate your ability to diagnose and fix issues quickly during the interview.
✨Showcase Your Problem-Solving Skills
Prepare to discuss past experiences where you’ve had to troubleshoot and resolve production incidents. Be ready to explain your thought process and how you ensure that issues don’t recur. This role is all about reliability, so highlight your ownership in previous roles.
✨Understand Fyxer's Product
Familiarise yourself with Fyxer’s AI Email and Meeting Assistant. Understand its features and the challenges it addresses for client-facing professionals. This will help you align your answers with the company’s goals and show your genuine interest in their product.
✨Be Ready for Live Problem Solving
During the interview, you’ll likely face live coding or problem-solving scenarios. Practice coding under pressure and think aloud while solving problems. This will showcase your technical skills and how you approach challenges in real-time.
