> Markdown version of [/jobs/ext/3170626-senior-staff-software-engineer](https://www.wearedevelopers.com/jobs/ext/3170626-senior-staff-software-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior/Staff Software Engineer - **Company:** Fonoa - **Location:** Greater London, UK - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** Business Logic, Microsoft Azure, Data Files, Design of User Interfaces, PostgreSQL, Node.Js, Cloud Services, TypeScript, Datadog, ReactJS, Backend, Kubernetes, Front End Software Development, Restful APIs, Terraform, Api Management, Microservices - **Published:** September 8, 2026 - **Apply:** https://www.collegerecruiter.com/job/2840574716-seniorstaff-software-engineer ## About the Role * You are fully proficient in English. Written and spoken, we are from around the world, but we work in English. * You have a strong sense of ownership, care about what you build, and do the right thing that serves your customers. * You're a builder at heart; you like the opportunity of having tons of exposure, making things work for a company long term, and having an entrepreneurial attitude toward anything that comes your way. * You are either eager to learn or comfortable scaling and operating large-scale microservices in high-growth environments. * You are proficient in a couple of languages; most of our current codebase is in node.js with Typescript and Go on the backend. We use ReactJS on the front end, but we are not married to any tools; we see them as a means to an end. * You like to keep your house tidy and clean, and you just can't leave code not covered with a test. Or a feature undelivered. Or dead code rotting in production. * You ship fast, continuously, and iteratively, learning each step. * You like to use data over opinions to make decisions. And are ok with finding the data yourself when it's missing. * You are comfortable with change, either in priorities, goals and deadlines. You see this more as an opportunity than a hurdle. You are also satisfied with challenging the status quo and pushing for change. * You want to make a severe impact and are excited about working in a high-growth startup. Note: If you feel you don't have the whole experience we're looking for but feel you could be a bit fit and are willing to learn, do apply anyway! We are trying to build a diverse and inclusive team. ## Description Fonoa has a suite of API products that automate tax-related workflows for any internet company. Check them out below: * For backend, we use Node and Go * For the frontend, we use ReactJS and Typescript * For persistence, we use PostgreSQL * We use Azure and GCP for our cloud services * We manage our infrastructure with Terraform, Kubernetes CRDs, ArgoCD and DataDog. "As an engineer, I follow a product through its lifecycle, from ideation to delivery and support, which gives a lot of exposure to the technology and customer needs. This allows me to learn to improve both myself and the product constantly." - Philip Beel, Engineering Manager. What you will do * Learn about how painful it is for companies to handle tax manually, and think about how our products are changing the status quo * Own what you build, with the ability to decide how to make it and the responsibility of operating it in the production environment. * Build meaningful products with REST APIs that our customers use and depend on for everyday business (finance, operation, tax and developer teams) * Build new product features across the stack, from back-end business logic implementation to front-end customer-facing interfaces. * Write high quality robust, modular code for frontend and backend * Ensure the technical feasibility of UI/UX designs as well as internal applications capabilities * Record and collate lots and lots of data sets from all these operations for long-term storage and future insight * Use every learning and observation to improve our products, constantly * Understand customer needs and the pain they are experiencing related to tax automation * Understand competitive products ## Related Videos - [The Memory Leak That Ate Our Cluster: A Postmortem](https://www.wearedevelopers.com/videos/2057-the-memory-leak-that-ate-our-cluster-a-postmortem) - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [Stop using Node.js like in 2020! 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