StephenByatt

Senior Software Engineer— Sydney, Australia

Frontend and mobile specialist building fintech integrations, distributed systems, and production SaaS products.

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Experience

01/03

Software Engineer

@ Cleo
Jun 2025 - PresentLondon, UK

Building fintech integrations and product experiments across Rails, PostgreSQL, React, and React Native. Owns Plaid transaction workflows, Google and Apple SSO rollout strategy, experimentation tooling, and CI improvements that reduced end-to-end test build times by up to 60%.

ReactReact NativeRuby on RailsPostgreSQLKafka
Nov 2024 - PresentRemote

Founded and independently built a production SaaS platform across React, React Native, TypeScript, and PostgreSQL. Owns architecture, deployment, observability, customer support, Stripe Connect and Zapier OAuth integrations, realtime messaging, queues, background workers, and LLM-powered coaching workflows.

React NativeTypeScriptPostgreSQLStripeLLMs

Software Engineer

@ Snap Inc.
Nov 2021 - Jun 2025Sydney, AU

Led technical design and delivery of Screen Sharing across iOS, Android, Web, and backend services, now used by more than one million users daily. Built and debugged multi-region calling systems across Go and C++ services, gRPC APIs, WebRTC components, Google Cloud, and BigQuery.

ReactGoC++WebRTCBigQuery
Cleo
Trainrr
Snap Inc.
Cleo2025 — Present
Trainrr2024 — Present
Snap Inc.2021 — 2025

About

I'm a senior software engineer with deep frontend and mobile expertise, complemented by backend experience across fintech integrations, APIs, and distributed systems. Currently at Cleo, I work on Plaid transaction workflows, SSO, experimentation tooling, and engineering workflow improvements. Previously at Snap Inc., I led Screen Sharing for Snapchat Calls across iOS, Android, Web, and backend services. I also founded Trainrr, a production SaaS platform with realtime messaging, Stripe Connect, Zapier OAuth, and LLM-powered coaching workflows.

Open to interesting projects and conversations.

Technologies
TypeScriptJavaScriptGoRubySQLReactReact NativeNext.jsRuby on RailsPostgreSQLNode.jsKafkaKubernetesGoogle CloudBigQueryWebRTCPlaidStripe ConnectOAuthLLM Tool CallingMCP
Get in touchsteve@byatt.dev↗