San Francisco

Stephen Cotterrell

Software engineer, focused on the backend.

I work across the stack, mainly in Go and TypeScript. Backend systems, infrastructure and DevOps are where I’d like to focus next.

See my work Get in touch

Open to software engineering roles · US work authorization, no sponsorship required

Selected work

Projects and contributions.

Collaborative project

MyStudioKeep

TypeScript · Next.js
PostgreSQL · Redis · BullMQ

Visit MyStudioKeep

Source code is private.

A platform for independent trainers to manage clients, bookings and payments.

My main contribution was adapting the deployment setup to my collaborator’s development workflow. I set up GitHub Actions staging promotion and Vercel deployments, keeping staging and production separate.

I also hardened Stripe webhook handling for duplicate deliveries and failed processing, and improved Google Calendar synchronization with background jobs, coalescing, locking and retries.

Local prototype

walkable.work

Go · PostgreSQL/PostGIS
React · MapLibre

A map for exploring Bay Area employer offices near a chosen location.

The Go API supports spatial searches, validated data imports and a report-review workflow. The React map handles changing searches, saved places and failed requests.

It maps employer offices rather than open jobs. Walking reach is a distance estimate, without street routing.

Terminal tool · Public source

Twig

Go · Linux · Bubble Tea

View Twig on GitHub

A terminal interface for managing WireGuard tunnels on Linux.

I built it to switch between local profiles and see which tunnels are active without typing out configuration names. It separates the terminal UI from command execution and tracks which operations succeeded or failed when working with multiple tunnels.

About

A little background.

Before moving into software, I worked in data analytics and chemical engineering research. I completed an MSc at the University of Cape Town, where I also taught numerical simulation and optimization.

I recently moved to San Francisco to join my wife, Emily. Away from the computer, I enjoy speedcubing and brewing.

More about those interests

Get in touch

Let’s talk.

I’m looking for a software engineering role in San Francisco, where I can contribute, learn from experienced engineers and work alongside people in person.

Book a conversation

stephencotterrell@gmail.com

GitHub Download CV (PDF)