Senior software engineer (Node.js/TypeScript)

Seccl; Greater London; Hybrid; GBP 70,000 - 110,000; Full time

Job summary

Seccl is seeking an experienced Software Engineer to design, build and operate scalable services using TypeScript and Node.js in a hybrid setup based in London, Bath or Edinburgh. You will contribute to a cloud-native platform, working within cross-functional squads and taking ownership of engineering outcomes.

You will join a high-growth fintech team under a culture that values reliability, quality, and technical excellence, with mentoring responsibilities for less experienced engineers and

Qualifications

• Strong experience with TypeScript and Node.js.
• Experience building scalable, cloud-based services on AWS.
• Familiarity with Terraform or similar IaC tools.
• Collaborative mindset with mentoring and ownership attitude.

Responsibilities

• Design, build and operate services within your domain.
• Contribute to architecture and code reviews.
• Own SLAs and reliability of your products.
• Maintain and extend technical documentation.
• Mentor other engineers and share knowledge.
• Collaborate with cross-functional teams to deliver outcomes.

Skills

TypeScript

Node.js

AWS

Terraform

Serverless Framework

GitHub Actions

MongoDB

Tools

AWS

Terraform

Serverless Framework

MongoDB

GitHub Actions

Job description

Hybrid working based at one of our offices in London, Bath or Edinburgh. Your contract will be hybrid, although we don’t currently require a set number of office days. We support flexible working and trust teams to agree how and where they work best, taking a pragmatic approach based on the needs of the role and team.

About Us

Seccl is the Octopus-owned embedded investment platform, on a mission to help more people invest, and invest well.

We’re building the infrastructure behind the next generation of investing. Our technology already powers some of the UK’s most ambitious fintechs, banks, financial advisers and wealth firms, with close to a million investors relying on Seccl-powered platforms. And we’re now expanding into Europe.

We’ve got a proven product, strong momentum and big ambitions for what comes next: helping more household-name brands launch and scale investment propositions, entering new markets and replacing outdated investment infrastructure with technology that’s faster, simpler and built for scale.

We’re proud to be part of Octopus, one of the UK’s most successful privately held investment and technology groups. That gives us the backing and long‑term perspective to build something substantial, while keeping the pace and energy of a high‑growth business. Seccl and Octopus are both B Corp certified and share a belief that profit and purpose should go hand in hand.

If you want to help shape the future of investing in the UK and across Europe, you’ll be in good company.

Check out the Seccl website to see what we’re building and read more about our mission to shape the future of investments.

Our Culture

• Never settle – We think of ourselves as ‘embedded hero-makers’ for our customers. We put them first, and if we say we’ll do something, we’ll move heaven and earth to do it. We think boldly and embrace change.
• Take ownership - We think rigorously and deeply about a problem, but then charge at it, acting with and urgency and speed that sets us apart. But we never lose sight of quality or long‑term scalability.
• Be generous & candid - We encourage our people – and our customers – to challenge us and never shy away from tough conversations. We have a flat and inclusive culture where everyone can be themselves – and speak up.

Our Engineering Ways Of Working

• Our Product and Engineering organisation is structured into four tribes: Custody, Accounts, Experience, and Cloud & Security. Each tribe contains multiple autonomous squads, with clear full ownership over specific product domains.
• The squads are intentionally small and cross‑functional, typically made up of an Engineering Manager, Product Manager, and 3–5 engineers with complementary skills aligned to the domain they own.
• We operate in a build‑and‑run model, with teams responsible for the full software lifecycle, from architecture and delivery through to operational support and incident management.
• Our core platform is built on AWS serverless technologies including Lambda, SQS, EventBridge, API Gateway, S3, and ECS. We primarily develop in TypeScript and Node.js, with MongoDB as our primary document database. We also have a small number of C# services and are continuing to evolve our platform architecture, including expanding our use of ECS Fargate.
• Infrastructure is managed through a combination of Terraform and Serverless Framework. We use GitHub Actions for CI/CD and incident.io to support our incident management processes and operational workflows.
• We care deeply about engineering quality, pragmatic architecture, and continuous improvement. If you’d like to go deeper, we’re happy to share more about our engineering practices and technology radar during the interview process.

The role

As an engineer at Seccl you will design, build and operate reliable and scalable, testable and maintainable software solutions, building new functionalities and products using Typescript and Node.js. You play a key role in our software development and have a hands‑on approach throughout the development process supporting resilient financial workflow systems and regulated investment operations. As a senior member of the team, you are the ‘go‑to’ person for queries.

On a typical day you will…

• Work collaboratively in a domain aligned cross‑functional squad made up of engineers and product along with colleagues from customer‑facing and operations teams
• Design, implement and operate your services within your domain
• Be accountable for the SLAs of your products and iterative improvements
• Maintain and extend documentation for your services
• Foster a culture of continuous improvement and technical excellence while understanding when “good enough for now” is appropriate
• Provide guidance and mentorship for other engineers
• Communicate with non‑technical colleagues to answer queries about the Sec