At a Glance
- Tasks: Own and scale our platform infrastructure while building innovative deployment pipelines.
- Company: Join StackOne, a fast-growing AI integration startup backed by top investors.
- Benefits: Enjoy meaningful share options, private health insurance, and a generous holiday allowance.
- Other info: Flexible hybrid working, with opportunities for career growth and development.
- Why this job: Make a real impact in a cutting-edge tech environment with a talented team.
- Qualifications: 4+ years in platform engineering with strong AWS and IaC skills.
The predicted salary is between 70000 - 90000 £ per year.
About StackOne: StackOne is the AI Integration Gateway for SaaS products and AI Agents. Backed by GV and Workday Ventures ($24M raised), we help builders of SaaS platforms and AI Agents orchestrate hundreds of scalable, accurate, and enterprise-grade integrations. Our platform combines 25,000 pre-mapped actions on 200 connectors, an AI-powered integration development toolkit, plus security by design: a real-time architecture, managed authentication and permissions, and end-to-end observability. Join us on our fast trajectory to build the future of agentic integrations.
About the role: We're looking for a Senior Platform Engineer to own how StackOne is built, shipped, and run, as we scale across our own cloud and into our customers' clouds. You'll own the infrastructure behind the platform, our deployment pipeline and developer tooling, and how we package StackOne to run inside customers' own AWS, GCP, or Azure accounts.
It's a hands-on role with broad scope. You write code and tooling, you own the IaC other engineers depend on, and you set the standard for how every new repository gets deployed and secured. You'll report directly to the CTO and work closely with our Security Engineer and tech leads.
Responsibilities:- Own our infrastructure at scale: the AWS estate today (ECS Fargate, Aurora, ElastiCache, MSK, OpenSearch, Lambda, KMS) and the AWS CDK to Terraform migration. Keep it reliable, observable, and cost-aware.
- Build out the deployment pipeline as we consolidate toward a monorepo: the CI/CD that ships every service, plus an automated end-to-end testing harness with incremental (affected-only) testing that stays fast as we grow.
- Ship into customers' own clouds (self-hosted / BYOC): the Terraform modules, container images, runbooks, and documentation for internal teams and customers.
- Own the release and upgrade path for self-hosted customers: versioned, signed releases, a supported-version policy, and a call-home for usage and version reporting.
- Set the standard for new repositories: partner with the Security Engineer and tech leads so new projects (product, internal tools, and vibe-coded prototypes) ship secure and deployable from day one. Templates and golden paths, not gatekeeping.
- Raise reliability: SLOs, observability, and incident response. Make the system easy to operate when something breaks at 3am.
- Treat infrastructure as a product: paved roads and self-serve tooling so product engineers ship without waiting on you.
- Use AI in the workflow: lean on LLMs and agents for IaC generation, test scaffolding, and runbook drafting, with guardrails you trust.
- 4+ years in platform, infrastructure, SRE, or DevOps, with hands-on AWS at scale: ECS/Fargate, RDS/Aurora, Lambda, networking, IAM, KMS.
- Deep IaC ability: Terraform and/or AWS CDK, comfortable owning modules other teams build on.
- Strong CI/CD and monorepo build experience: caching and incremental/affected-only test execution. You've made a slow pipeline fast.
- Strong coding in TypeScript, Python, or Go. You build tooling, not just YAML and configs.
- Containers in production (Docker); Kubernetes a plus.
- Security-minded: you bake secure defaults into pipelines and repo templates, and partner with security rather than routing around it.
- A clear writer: docs and runbooks that internal engineers and external customers can follow.
- End-to-end ownership: you scope, ship, and measure, and automate instead of running manual checklists.
- Shipping software into customers' own cloud or on-prem (BYOC / self-hosted), or a platform like Nuon, Replicated, or Omnistrate.
- Multi-cloud (GCP or Azure) IaC, and exposure to Temporal, Kafka/MSK, ClickHouse, or OpenSearch.
- Cloud & infra: AWS (ECS Fargate, Aurora Postgres, ElastiCache, MSK, OpenSearch, Lambda, S3, KMS, CloudFront, WAF), Cloudflare (Workers, WAF)
- IaC: AWS CDK today, migrating to Terraform
- Data & messaging: Postgres, Redis, Kafka, OpenSearch, ClickHouse
- CI/CD: GitHub Actions
- Observability & analytics: Datadog, Sentry, Metabase
- Languages: TypeScript (Node.js), Python
- Meaningful share options (EMI)
- 25 days holiday + 1 additional day per year of tenure
- Private health insurance, including dental & optical
- £15/day London office lunch budget, up to £120/month
- £1,000 home office setup + £500/year top-up
- Annual team offsite to sunny spots
- Join one of Europe's fastest-growing startups
- Work with a veteran team of ex-Google, Microsoft, Oracle, Coinbase, JP Morgan and more
- Health, fitness and gift card discounts; Cycle2Work and Electric Cars scheme
- London (hybrid, ~2 days/week) preferred; open to remote within the UK
We believe diversity drives innovation. We encourage individuals from all backgrounds to apply. As an equal-opportunity employer, we celebrate diversity and are committed to creating an inclusive environment for all employees.
Senior Platform Engineer in London employer: StackOne
StackOne is an exceptional employer for AI Engineers, offering a dynamic startup environment where innovation thrives. With a strong focus on employee growth and collaboration, team members are encouraged to explore cutting-edge technologies while contributing to meaningful projects that shape the future of SaaS integrations. Located in a fast-paced industry backed by top-tier investors, StackOne provides unique opportunities for professional development and the chance to make a significant impact in the world of AI.
StudySmarter Expert Advice🤫
We think this is how you could land Senior Platform Engineer in London
✨Tip Number 1
Network like a pro! Reach out to folks in your industry on LinkedIn or at meetups. A personal connection can often get you a foot in the door faster than any application.
✨Tip Number 2
Show off your skills! Create a portfolio or GitHub repo showcasing your projects and contributions. This gives potential employers a taste of what you can do, especially for a hands-on role like Senior Platform Engineer.
✨Tip Number 3
Prepare for interviews by practising common technical questions and scenarios related to platform engineering. We recommend doing mock interviews with friends or using online platforms to get comfortable.
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows you’re genuinely interested in joining StackOne.
We think you need these skills to ace Senior Platform Engineer in London
Some tips for your application 🫡
Tailor Your Application:Make sure to customise your CV and cover letter for the Senior Platform Engineer role. Highlight your experience with AWS, IaC, and CI/CD pipelines, as these are key aspects of what we're looking for at StackOne.
Show Off Your Coding Skills:Since coding is a big part of this role, include examples of your work in TypeScript, Python, or Go. We want to see how you build tooling and not just configurations, so don’t hold back!
Be Clear and Concise:When writing your application, clarity is crucial. Use straightforward language and structure your documents well. We appreciate a clear writer who can create docs and runbooks that others can easily follow.
Apply Through Our Website:We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it shows you're keen on joining our team!
How to prepare for a job interview at StackOne
✨Know Your Tech Stack
Make sure you’re well-versed in the technologies mentioned in the job description, especially AWS services like ECS Fargate and Aurora. Brush up on your IaC skills with Terraform and AWS CDK, as you'll need to demonstrate your hands-on experience during the interview.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific challenges you've faced in previous roles, particularly around CI/CD pipelines and infrastructure reliability. Use examples that highlight your ability to think critically and implement effective solutions, especially in high-pressure situations.
✨Communicate Clearly
As a Senior Platform Engineer, clear communication is key. Practice explaining complex technical concepts in simple terms, as you’ll need to write documentation and runbooks that others can follow. This will show your potential employer that you can bridge the gap between tech and non-tech teams.
✨Demonstrate Your Security Mindset
Be ready to discuss how you incorporate security into your workflows. Share examples of how you've baked secure defaults into your pipelines or collaborated with security teams. This will show that you understand the importance of security in platform engineering.
