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.
What we're looking for:
- 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.
Nice to have:
- 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.
Our stack:
- 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
Benefits:
- 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
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at StackOne or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to StackOne.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like StackOne.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like StackOne that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Senior Platform Engineer in London
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at StackOne.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at StackOne and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at StackOne
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If StackOne uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
