Principal web developer Work, Jobs (with Salaries)

Senior Site Reliability Engineer - Edge
On AG —London
- AWS
- APIs
- IT
Principal Engineer - Digital Experience Platform
Skipton Building Society —Skipton
- Full-time
- Hybrid work
- Java
- Mentoring
- APIs
- Annual leave
Principal Grafana Network Analytics Engineer
Corero —Edinburgh
- Hybrid work
- Computer Science
- Data analysis skills
- SQL
- Annual leave
- Life insurance
Principal Software Engineer, Backend - Full or Part Time
Autotrader —Manchester
- £60,000 - £80,000 a year
- Part-time
- System design
- Java
- SQL
Application Security Engineer
Millennium Management —London
- Azure
- Computer Science
- Java
Software Engineer (Java Mid)
interactive investor —Manchester
- From £50,000 a year
- Full-time
- Hybrid work
- DevOps
- Java
- AWS
- Annual leave
- Employee discount
Quick apply
Principal Software Engineer - Engineering Manager - Data and AI Platform
JPMorganChase —London
- Full-time
- Azure
- Java
- AWS
Software Engineer (Full Stack, Java)
interactive investor —Manchester
- From £50,000 a year
- Full-time
- Hybrid work
- DevOps
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- AWS
- Annual leave
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Quick apply
Salesforce Technical Architect
Sky —Livingston
- Full-time
- Hybrid work
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Software Engineer (React & Node.JS)
interactive investor —Manchester
- From £45,000 a year
- Full-time
- Hybrid work
- DevOps
- AWS
- JavaScript
- Annual leave
- Employee discount
Quick apply
Software Engineer (Senior Java)
interactive investor —Manchester
- From £60,000 a year
- Full-time
- Hybrid work
- DevOps
- Java
- AWS
- Annual leave
- Employee discount
Quick apply
Senior Financial Systems Analyst
Goodwin Procter LLP —London
- Full-time
- Microsoft Access
- Computer Science
- Customer service

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Principal Engineer - Digital Experience Platform
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Our websites and digital journeys serve our members, prospects, customers and brokers through millions of visits each month. 3 paid volunteering days per year.
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Senior Site Reliability Engineer - Edge

On AG -
London

Apply Now

Job details

Qualifications

TCP
Cloud infrastructure
Kubernetes
Google Cloud Platform
AWS
Terraform
DNS
GitHub
APIs
IT
GraphQL
HTTPS

Full job description

Location: London

Technology

In short

In the dynamic landscape of On, our technology thrives much like a spirited runner: always moving, always improving. We are building the foundation that allows our engineering organization to scale, innovate, and deliver "Wow" to athletes worldwide. To power this mission, we are seeking a Senior Site Reliability Engineer (SRE) - Edge who understands that reliability, security, and performance start at the transport layer. You won't just manage a CDN; you will own the architecture and performance of our global entry points, including our Apollo GraphQL API Gateway. You will leverage expert-level knowledge of HTTP/S, TCP, and DNS to optimize for global throughput. This is a hands-on senior role where you will troubleshoot advanced network bottlenecks, design our future content delivery strategy, and act as the technical authority for our Web Application Firewall (WAF), bot mitigation, and standardized service authentication.

Your Mission

Edge Architecture & API Gateway: Ensure high availability (99.95%+ uptime) for On’s digital platforms and our central Apollo GraphQL Gateway. You will design the "front door" of our infrastructure to be elastic, handling the unique scaling demands of both static web assets and complex federated API traffic.
Traffic Engineering & Segmentation: Lead the strategic roadmap for our CDN (Cloudflare) and networking stack. You will distinguish between the needs of customer-facing web applications and internal service-to-service communication, implementing optimized routing for each.
Environment Isolation & Security: Implement and maintain robust guardrails to protect our internal ecosystem. You will be responsible for restricting pre-production environments (e.g., Staging, QA) from the public internet using Zero Trust models, IP-based access controls, or OIDC-integrated tunnels.
Standardized Auth & Access: Drive the standardization of authentication and authorization at the edge. You will ensure that every request entering our network is consistently validated, providing a secure and seamless identity layer for all microservices.
Advanced Troubleshooting: Serve as the organization's "Level 3" expert for complex network traffic analysis. You are the one who dives into packet captures, TLS handshakes, and Apollo query latencies to find the root cause of global performance regressions.
Shielding the Origin: Take full ownership of our WAF and Bot Management strategy. You will design and implement measures to protect our services from DDoS attacks and malicious actors without impacting the legitimate athlete experience.
Infrastructure as Code (IaC): Treat the network and the gateway as code. You will manage edge configurations and gateway routing using Terraform, ensuring our security rules and routing logic are versioned, tested, and automated.

Your story

Networking & Gateway Authority: You have a deep understanding of the OSI model and experience managing API Gateways (specifically Apollo GraphQL). You understand how to optimize the "supergraph" for performance at the edge.
Edge & Security Specialist: Proven experience managing high-traffic CDN architectures (Cloudflare preferred) and a strong grasp of modern security protocols like OIDC, OAuth2, and JWT for standardizing service access.
Infrastructure Security: You have experience implementing "Zero Trust" architectures and managing private network connectivity to isolate internal environments from public exposure.
Cloud Native: You are comfortable in modern cloud environments (GCP/AWS) and have experience with Kubernetes (GKE), service mesh networking, and ingress controllers.
Automation First: You believe that manual changes are technical debt. You are proficient in Terraform and familiar with CI/CD workflows (GitHub Actions) for deploying networking changes safely.
Collaborative Leader: You enjoy working across teams (Security, DevEx, and Product) to solve horizontal problems. You can translate complex networking and auth concepts into actionable insights for non-experts.

About the Team

You will be joining the Platform Foundations group, a high-impact collective of engineers dedicated to building the "Engine" of On's technology. We manage our cloud infrastructure, Developer Experience (DevEx), and the Edge. We are a global team that values a "lead-by-example" culture. You will work alongside Staff and Principal engineers to bridge the gap between infrastructure and product, ensuring our technical investments directly accelerate the velocity of On’s mission.

London

Home to nearly 3000 parks, a population speaking more than 300 languages, and a vibrant art and music scene, London is one of the world’s most loved cities for good reason.

12 Fleur De Lis Street,
E1 6DB
United Kingdom

Location

What we offer

On is a place that is centered around growth and progress. We offer an environment designed to give people the tools to develop holistically – to stay active, to learn, explore and innovate. Our distinctive approach combines a supportive, team-oriented atmosphere, with access to personal self-care for both physical and mental well-being, so each person is led by purpose.

On is an Equal Opportunity Employer. We are committed to creating a work environment that is fair and inclusive, where all decisions related to recruitment, advancement, and retention are free of discrimination.

Build the better you

What to expect

We want to set everyone up for success, so here’s the lowdown on how we hire. Our process is a two-way street – bringing you into our culture, while helping us learn how you think.

Our full process can last about eight weeks from application to offer, because we care about getting it right. These steps explain how we usually do things.

Before you get started, feel free to consider if you want to work with us. Strange question? Well, we give people a lot of space to navigate their day-to-day and that style isn't for everyone. We want you to be passionate about what you do and be sure this is the right fit. Because when skills and passion combine – it creates that 'Wow' moment.

Step One

It starts with you...

You'll start by submitting your application to a specific role. We try to keep this step as simple as possible. We do get a lot of applications, but we review them all. If you're a good fit to the role, a recruiter will follow up with you directly. If you didn't receive a reply, or were unsuccessful this time around, we encourage you to look for other possible matches at On.

Step Two

Interview with a recruiter

What ignites your spirit? This is where we’ll start getting to know all about you and what makes you tick – and it’s your first chance to get a feel for our culture. Chatting with a member of our talent team, you’ll learn more about On and how we work. We’ll learn about what motivates you and what you could bring to the team.

Step Three

Interview with a hiring manager

Ready to dig into the details? This second interview will be held with your future manager and will focus on the specifics of the job. Together you’ll delve into your unique skills and experiences and how they could be relevant at On. It's also a time to assess how you might feel working side-by-side. Bring any questions you have about the job, the team or anything else you might like to know – this is an open forum.

Step Four

The Case Study

What's your style? This task will help us understand how you think, face a challenge and give insight into your novel ideas. Designed to give everyone their best shot, your case study is based on something you might typically experience on the job. This is your chance to show us what you’ve got. So express yourself. Be you.

Step Five

The Experience Day

Your first taste of the Oniverse. This is a time to meet some of the people you'll be working closest with. In person or virtually, you'll get a feel for the day-to-day at On and the people who make it happen. You'll chat with a few potential teammates - the conversations will be as equally driven by the role and your experience as by our values. We believe how you do things is just as important as what you do.

Step Six

The Result

Are we a good fit? We’ll get together internally to share our feedback and decide if we’re a match. We know that job searching is a big time investment, so it’s not a decision we take lightly. It’s also time for you to reflect on the experience – are we the right place for you? No matter the outcome, we’ll give you meaningful feedback.

Apply Now

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Technology

In short

Your Mission

Your story

About the Team

London

What we offer

What to expect

Step One

It starts with you...

Step Two

Interview with a recruiter

Step Three

Interview with a hiring manager

Step Four

The Case Study

Step Five

The Experience Day

Step Six

The Result