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Software + Site Reliability Engineer (Node.js/Typescript + AWS)

Zeller

London Hybrid permanent

Posted: September 30, 2025

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Quick Summary

We're looking for a Software + Site Reliability Engineer to join our team in London, where we're helping businesses reduce complexity and time taken to take and make payments, manage complex fleets of payment hardware, store and save money and lead the conversation.

Job Description

We believe that businesses of all sizes deserve better financial and payment products and services. Traditionally, businesses of all sizes are let down by slow applications, protracted onboarding, opaque pricing, restrictive contracts and forced to use outdated solutions that no longer meet the innovative requirements of modern business.

We started our journey four years ago, and have since helped tens of thousands of Australian businesses reduce the complexity and time taken to take and make payments, manage complex fleets of payment hardware, store and save money and lead the conversation in business-to-business fintech. We’re now taking our next steps in expanding our industry and world leading capabilities into the United Kingdom.

Our company is backed by leading global VCs, and brings together experienced payment and tech industry professionals who are aiming to redefine business banking and the way businesses get paid by their customers.

If you are passionate, curious, hungry and seeking an opportunity to make your mark on Fintech in the United Kingdom, with the strength of a global team behind you - we’d love to talk to you. This is a unique opportunity to shape, direct and build better financial services for all UK businesses.

Role description
As Zeller continues to scale rapidly we're seeking a talented Software + Site Reliability Engineer to join our innovative team and be part of a team that is responsible for a mission critical system.

As a Software + Site Reliability Engineer you will be responsible for both developing, deploying new, enhancing and operating existing software systems. This means you will get to wear two hats as both a Senior Software Engineer and a Site Reliability Engineer.

You will get satisfaction from the high impact contribution of your work and fulfilment of the mindsets embracing teamwork, care factor and the motto “You build it, you own it”.

You will have excellent software engineering skills and knowledge of event-sourcing architecture and cloud native architecture in AWS.


Skills, Experience and Qualifications:
• Minimum of a Bachelor degree in software engineering (or related);
• Experience as both a Software Engineer and DevOps (or equivalent to Site Reliability)
• Strong background in software engineering and design patterns;
• Mastery of cloud-native application development in AWS, including serverless (Lambda, DynamoDB) and container-based (ECS) solutions
• Knowledge in architecture patterns such as; CQRS, event-sourcing;
• Proficient in Typescript, NodeJS, Java;
• Expertise in API design (RESTful, GraphQL, Webhooks) and database management (SQL, NoSQL)
• Passion for clean code, automated testing (TDD, BDD), and maintaining zero technical debt
• Track record of supporting rapid, agile deployments across multiple environments
• Proven track record in developing and maintaining mission-critical high-load production systems with SLA 99.999%;


Bonus points:
• Experience in working within a high-growth environment
• Familiarity with other cloud platforms (Azure, Google)
• Experience in other programming languages
• Additional programming language expertise
• Experience with PCI compliant environments (PCI-DSS, etc)


Like the rest of the team, you’ll benefit from

- An opportunity to shape and build the future of Zeller from the ground up in the UK
- A competitive salary package, including equity from an early stage;
- A balanced, progressive, and supportive work environment;
- Endless learning and development opportunities;
-Excellent parental leave and other leave entitlements;
-Being part of a fast-growing and ambitious scale-up.

At Zeller, we celebrate diverse perspectives and experiences, and strongly encourage people of all backgrounds and identities to apply to join our team.

We want you to be able to show up at your best during the recruitment process. Please, let us know if you require any accommodations during your interview process with us.

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