Senior Platform Engineer in London

Why Semble

Are you looking to impact and be part of something special, such as shaping the future of healthcare?

At Semble, we are on a mission to enable health professionals to amplify their impact.

We improve the way healthcare is delivered to millions of people by providing doctors and their teams with powerful, innovative, intuitive, and secure software.

Our cloud-based clinical system is already used by thousands of clinicians, making their lives easier and saving them money, while structuring their health data to help research.

• We are a passionate and driven team, lucky to unite under strong cultural drivers:
• Impact - We do work that matters.
• Collaboration – We are in it together.
• Human touch – We care deeply.

This role can be fully remote in the UK and EU (with occasional travel to our London office) within +/- 2 hours of the GMT time zone.

We are unfortunately not able to consider candidates located outside these locations and time zones at this stage.

About the Team
We're guided by one core question: how do we help our colleagues reduce cognitive load and get more done?

Whether that's building tools to make operating code in production easier, running foundational shared services, or educating engineers on AWS and Kubernetes, our work has a direct multiplier effect on the rest of the business.

We work closely with security and Implementation teams to make sure our infrastructure decisions serve the wider organisation's goals.

The Platform team exists to make the whole engineering organisation more effective. We're responsible for:

• Developer Productivity and Experience, including the tooling engineers rely on every day;
• Developer Enablement and Engagement, helping teams self-serve and grow their skills
• Cloud Infrastructure, spanning AWS, Kubernetes (EKS) and Mongo DB Cloud
• Agentic platform enablement, workflows and automation
• Infrastructure as Code, primarily through Terraform
• Modern CI/CD, using Git Ops patterns and tools such as Argo CD

The Role

As a Senior Platform Engineer, you'll be a driving force behind the evolution of Semble's engineering platform and the day-to-day experience of every engineer who builds on top of it.

You'll champion infrastructure best practices, shape team goals, and influence the wider engineering roadmap.

Just as importantly, you'll obsess over friction: the small (and large) things that slow engineers down, and how to remove them through better tooling, clearer paths, and stronger enablement.

This is a senior, high-trust role: you'll be expected to make sound architectural judgement calls, mentor other engineers, and represent the Platform team's priorities in cross-functional conversations, all while keeping empathy for the end-user (your fellow engineers) at the centre of what you build.

In One Year, You'll Know You Were Successful If You...

• Developer productivity and enablement
• Reduced the barrier for every engineer to build, ship, and operate their own code in production, measured through faster lead time for changes and fewer hand-offs
• Built or improved self-service tooling and "golden paths" (e. g. project templates, standard CI/CD pipelines, scaffolding tools) so teams can spin up new services without needing Platform's direct involvement
• Improved onboarding for new engineers, shrinking the time it takes someone to make their first meaningful production contribution
• Ran or contributed to developer experience initiatives such as office hours, internal workshops, or "lunch and learn" sessions to build AWS/Kubernetes/CI-CD literacy across the wider engineering org
• Wrote and maintained clear, discoverable documentation and runbooks, treating docs as a product with the same quality bar as code
• Gathered and acted on developer experience signals (e. g. surveys, feedback loops, usage metrics on internal tools) to prioritise the roadmap based on real pain points, not assumptions
• Partnered with engineering teams to understand their workflows first-hand (shadowing, pairing, dogfooding your own tools) rather than building in isolation
• Brought innovative ideas to the team and contributed meaningfully to the Platform roadmap, balancing infrastructure evolution with tooling and enablement work
• Established objective measures of "done" and documented assumptions clearly, so both infrastructure and tooling initiatives had transparent success criteria
• Contributed to observability as code initiatives, both inside the team and across engineering
• Infrastructure & reliability
• Provided a highly available and performant platform, including our AWS, Kubernetes (EKS) and Mongo DB Cloud infrastructure
• Hardened production systems, improving uptime, graceful degradation, and automated recovery
• Modernised our CI/CD pipelines leveraging Git Ops practices (e. g. Argo CD), making deployments faster, safer and more transparent
• Evolved our Terraform-based Infrastructure as Code, improving consistency, reusability, and safety of infrastructure changes
• Established or improved SLAs/SLOs for core platform infrastructure
• Worked with Security to raise our compliance and security posture without adding unnecessary burden on other engineering teams
• Identified and delivered infrastructure cost-saving opportunities
• A Background Like This Helps
• Developer productivity & enablement
• A solid background in software engineering (3-5 years), ideally having spent meaningful time as a product/application engineer before moving into platform work, giving you real empathy for the developer experience you're building for and the judgement to design tools and systems that fit naturally into developer workflows.
• Experience building or contributing to internal developer platforms, portals, or self-service tooling (e. g. Backstage, custom CLIs, service catalogues)
• A track record of designing "paved roads" or golden paths that make the right way the easy way for other engineers
• Experience improving CI/CD pipelines not just for reliability, but for speed and developer feedback loops (e. g. reducing build/deploy times, improving local dev environments)
• Comfort running enablement activities: writing documentation, running training sessions, pairing with other teams, or acting as an internal advocate for good engineering practices
• Experience using developer experience metrics or frameworks (e. g. DORA metrics, SPACE framework, internal Dev Ex surveys) to guide prioritisation
• A genuine interest in developer experience: you get satisfaction from removing friction for other engineers, not just from the infrastructure itself
• Worked with monitoring and observability tools such as Datadog
• General
• Proficiency in at least one of: Go, Python, Typescript, or strong shell scripting skills
• Strong communication skills and comfort influencing technical direction across teams
• A desire to keep learning, we'll help you grow further
• Infrastructure & cloud
• Deep understanding of core AWS services including IAM, S3, EC2, EKS, RDS, Lambda.
• Experience running, maintaining and troubleshooting Kubernetes clusters (EKS) in a production, multi-tenant environment
• Proven experience with Infrastructure as Code, particularly Terraform, and configuration/deployment tooling such as Helm
• Hands-on experience with modern Git Ops CI/CD tooling (Argo CD, Flux, or similar)
• Experience with Mongo DB or similar managed database platforms
• Experience monitoring and operating production systems (e. g. Datadog, Prometheus, Grafana)
• Experience operating within a standards-compliant environment (e. g. ISO 27001)
• What you’ll get in return
• The great feeling coming with knowing you do something that matters: shaping the future of healthcare!
• Autonomy and ownership – we’ll set the vision and share the context, then we trust you to run with things – that’s the reason we hire you!
• 36 days off: 25 holidays +bank holidays +3 extra days (birthday and ‘feel good’ days) - that we will expect you to actually take so you can recharge and rest.
• Private Health Insurance – covering physical and mental health, as well as dental and optical!
• Hybrid & flexible work environment – work from anywhere in the UK, with also some flexibility to work across Europe. You decide how much or how little you go to the office.
• Get the tech you need -
  You will get the latest Mac Book (unless you prefer Windows) and take your pick across a wide range of equipment to set up your home office ergonomically.
• Work alongside an inspiring team – our two founders have started Semble after a successful startup exit, and your future colleagues are all knowledgeable and innovators in their field.
• Fantastic office space in Central London, right outside Monument - with a roof terrace, weekly animations, loads of natural light, and cute doggies!
• The usual free bits coming with nice offices (barista coffee, tea, fruit, happy hours and activities...).

We welcome applications from people of all backgrounds and all walks of life, including any typically underrepresented groups in the technology industry.

We also encourage applications from disabled and neurodiverse candidates, so if there are any adjustments we can make to support you throughout the recruitment process, please do let us know.