Software Engineer (JavaScript/TypeScript)

About Onsi

Onsi supports businesses in enhancing the financial wellbeing of their workers through payments, rewards, and insurance. Focused on businesses with gig and shift workers, Onsi is underpinned by a tiered programme to boost engagement and retention, helping businesses achieve their key metrics. As the scope of our ambition grew, we realised we needed a new identity. One that represented our new mission - to create a world of work where everyone wins. In late 2023 we rebranded from Collective Benefits to Onsi; a warm, positive brand built with communication and connection at its core, that represents our position on the side of the business and of the worker. We’ve got backing from the people behind Deliveroo, Zoopla and DeliveryHero and have been featured in The Economist, TechCrunch and The Times (to name a few).

A brief overview :

As a Software Engineer at Onsi, you will build and maintain scalable web applications and services; monitor, test, and continuously optimise our systems; and deliver testable, maintainable, and high-quality code.

What you will do :

• Take broad and ambiguous problems and turn them into delightful products.
• Develop new, scalable features spanning both the front end and back end.
• Build reusable components/services for future use.
• Work with a team of highly skilled engineers, often pairing on interesting challenges (we don’t work in silos!)
• Investigate, resolve and mitigate service-impacting events
• Partner with product, engineering, and design to oversee the development of a product from problem definition, and conception to launch (and then some).

Job Requirements

• You are highly proficient in TypeScript, being well versed in ReactJS as well as some experience in NodeJS.
• You are experienced in integrating with RESTful APIs.
• Base level knowledge of CICD flows (We use github actions)

Nice to have:

• Industry experience in a regulated space (Fintech, Financial Services, Insurtech).
• Practical experience with AWS, as well as some experience with some of its components such as ECS, S3, CloudFront, API Gateway.
• Have an understanding of how Docker containers work

Copyright © ReadingWaters 2025.