Platform engineer

Seccl; United Kingdom; On-site; GBP 55,000 - 75,000; Full time

Benefits offered by this job

MacBook and home office budget

Private medical insurance

6% pension contribution

Learning budget (£750)

Volunteer days

Cycle to Work

Job summary

Seccl is seeking a Platform engineer to shape and evolve the cloud platform that underpins our investment products. The role sits in the Cloud Resilience team, empowering squads to build and run their own services in a primarily AWS environment.

The ideal candidate loves solving engineering problems, treats the cloud platform as a product, and collaborates with Node.js/TypeScript engineers to deliver scalable, secure, and observable systems with Terraform-managed infrastructure.

Qualifications

• Proven experience as a platform engineer in regulated environments.
• Fluent in JavaScript/TypeScript applications.
• Experience with MongoDB/Postgres databases and designing for scale and resilience.
• Strong observability mindset with actionable alerts.
• Proficiency in AWS best practices, Terraform, and CI/CD tooling like GitHub Actions.
• Experience owning platform-level outcomes.

Responsibilities

• Architect scalable, secure infrastructure in AWS using Terraform.
• Design cloud-native solutions using MongoDB, Lambda, API Gateway, and other AWS services with a strong focus on serverless.
• Contribute to incident response, production readiness, and reliability initiatives across engineering squads.
• Enhance observability and platform insight through actionable alerting and data visibility using Datadog.
• Continuously improving CI/CD processes with GitHub Actions, reducing friction in delivery pipelines.
• Collaborate with software engineers (working in Node.js/TypeScript) to ensure secure, performant, and resilient applications.
• Mentor engineers and champion DevOps culture and best practices across teams.

Skills

TypeScript/JavaScript development

Observability mindset

Cloud architecture design

Mentoring

Tools

Terraform

MongoDB Atlas

Datadog

AWS

GitHub Actions

Job description

Hybrid with travel to Bath, London and Edinburgh a couple times a month

About us

Seccl is the Octopus-owned embedded investment platform that’s on a mission to helping more people to invest – and invest well.

We’re B-Corp certified with an amazing product-market fit, impressive early traction and the potential to transform an outdated industry, for the better. We've been growing fast and will scale even faster over the next few years.

We’re also proud to be part of Octopus, the £multi billion group that's on a mission to breathe new life into broken industries, through companies like Octopus Energy, Octopus Investments and Octopus Money.

Check out the Seccl website for the latest on our products and our mission to shape the future of investments.

The role

We're looking for a Platform engineer to shape and evolve the platform that underpins our investment products. You’ll be someone who loves understanding engineering problems and enabling teams to self-serve their needs. You view the cloud platform as a product, and engineering as your customer.

The role is within our Cloud Resilience team - a critical squad within our engineering organisation responsible for empowering squads to build and run their own services.

We’re primarily in AWS, utilising Lambda, ECS, SQS, EventBridge, API Gateway, Aurora, Redshift among others. Our main data store is MongoDB Atlas and our observability platform is Datadog. Our application is written in Typescript/NodeJS and our infrastructure is defined in Terraform.

On a typical day you will be…

• Architecting, implementing, and maintaining scalable, secure infrastructure in AWS using Terraform.
• Designing cloud-native solutions using MongoDB, Lambda, API Gateway, and other AWS services with a strong focus on serverless.
• Contributing to incident response efforts, production readiness, and reliability initiatives across engineering squads.
• Enhancing observability and platform insight through actionable alerting and data visibility using Datadog.
• Continuously improving CI/CD processes with GitHub Actions, reducing friction in delivery pipelines.
• Collaborating with software engineers (working in Node.js/TypeScript) to ensure secure, performant, and resilient applications.
• Mentoring engineers and champion DevOps culture and best practices across teams.

This role’s for you if...

• You’re a pragmatic platform engineer with experience in regulated environments, balancing delivery with compliance and operational excellence.
• You’re confident working with JavaScript/TypeScript-based applications and collaborating closely with development teams.
• You know what “good” looks like for databases like MongoDB and Postgres and can diagnose, design, and optimise for scale and resilience.
• You care deeply about observability – you don’t just monitor systems, you build alerts that engineers can act on.
• You’re fluent in AWS best practices, infrastructure-as-code (Terraform), and CI/CD tooling like GitHub Actions.
• You’ve had exposure to architectural decisions and willingness to own of platform-level outcomes.

This role isn’t for you if...

• You rely on a lot of top-down direction. Here, you’ll have a lot of freedom and ownership of your role, and you’ll be expected to shape your own progression.
• You’re not comfortable working in a fast-paced environment. Our speed and scalability are what set us apart; you need to be able to act quickly and think on your feet.
• You struggle to follow through on ideas. We value people who do what they say they will. If you care about something, you have the freedom here to make it happen.
• You don’t like change. You’ll get on great here if you relish the ambiguity of rapid growth and are willing to embrace uncertainty.

What’s in it for you…

We offer a generous mix of benefits for the things that really matter to our people, including:

A salary between £55,000 and £75,000 – dependant on experience + reviewed annually

27 days holiday + bank holidays (some can be flexible) + day off on your birthday + three days (full time) per year for Dependant leave

Two volunteering days per year

Option to work abroad for up to six weeks a year

Secclbrate - our recognition programme that offers a mix of flexible rewards including extra pay, additional holiday and increased learning budget

Length of service award – one month paid sabbatical at eight years

6% employer pension contribution, and life assurance

Private medical insurance with AXA Health

Enhanced Parental leave

MacBook and up to £500 home office set up budget

£750 per person learning budget

Health and wellbeing initiatives including free therapy via Wellness Cloud, mental health support via Headspace

Strong financial wellbeing focus including access to Octopus Money, Octopus Share Incentive Plan and will writing offering via Octopus Legacy

Perkbox – Flexi-points giving you a range of discounts and perks including free weekly coffee, gym and retail discounts

Access to initiatives like Cycle to Work and Octopus Electric Vehicle Leasing

Our culture

We're proud to put people first, creating a culture where we truly listen to what matters most to them. Our transparent and inclusive environment encourages diversity of thought, challenge and experimentation.

Check out our Glassdoor page for the latest reviews or our LinkedIn for company updates and insights from the team.

Interview process

Interviewing is a two-way thing, and we want you to have the time and opportunity to get to know us, as much as we are getting to know you. Our interviews are conversational, so come with questions and be curious. In general, you can expect the interview process to look a bit like this, (following an initial chat with one of our Talent team):

• First stage – 60 mins Cloud System Design interview
• Second stage – 60 mins Terraform Code Review Interview
• Final stage – 45 mins bar-raiser culture-based interview

Our aim is to build a diverse and inclusive company of awesome people, with unique skills, passions and experiences. All applicants will be considered for employment without attention to age, ethnicity, religion, sex, sexual orientation, gender identity, family or parental status, national origin, or veteran, neurodiversity or disability status.