Eric Sekyere Full-stack engineer

I build systems.
You can test them.

I build full-stack tools and services with Python and TypeScript. Try a shipped product, inspect the engineering, or put a system under pressure.

Explore my work Get in touch

Start here: can extra capacity fix a slow dependency?

Try an engineering decision

Login is slow. What would you try?

A shop’s login service is overloaded. Requests pile up before checkout. Pick a fix and see how many get through.

Requests Login the bottleneckCheckout

How the simulation works

This uses the Microservice Meltdown engine. “Login” is its Auth service; adding a server adds one replica. Both runs receive 60 requests per second for 60 simulated seconds. Auth slows by 50 ms at second 10; your fix starts at second 12. Request limiting ends at second 40.

Every request is completed, failed, or still queued. This is a repeatable model with fixed routing and immediate scaling, not a production benchmark or a financial cost model.

Investigate in the full lab

Selected projects

Open the app. Inspect the decisions.

All projects

Shipped product / Open source

Murmur

A desktop voice tool that turns speech into text, meeting notes, and code identifiers using local models.

From microphone to editor

WindowsLinuxmacOS

Local speech model Rust audio pipeline · Desktop interface

DictationMeeting notesDeveloper commands

The challenge: Keep audio capture responsive while speech recognition and optional AI processing run on the same machine.
The decision: Separate capture from inference, process speech locally, and use deterministic rules for developer formatting commands.
What to inspect: Try the text formatter in your browser, read the source, or download the app. Speech recognition runs in the desktop app; the browser demo shows the formatting stage.

Explore Murmur Read the source

Developer tooling / Personal project

Polyglot Code Sandbox

Run code in four languages without setting up a local development environment.

Execution boundaries

Code editor Unified test output

JS / TS Sandboxed iframe Python Pyodide Rust Playground API

The challenge: Different runtimes need one consistent editor, error format, and test experience.
The decision: Separate execution from the interface. Use sandboxed frames for browser code, Pyodide for Python, and a remote API for Rust.
What to inspect: Run a failing test or an infinite loop. Structured errors and watchdog timeouts keep failures contained. Rust execution requires the external service.

Run the sandbox Read engineering notes

journey.trace

From scripts to systems.

A stack trace of how my engineering work grew. Open a frame to follow the context.

share.tools()Make useful work reusableFeb 2016 – Jun 2019
- AngularJS
- ExpressJS
- APIs
Built a centralized scripting repository adopted company-wide, and co-developed a tool for testing and validating product concepts.
The work centered on turning scattered scripts into tools other people could find and use. Shared access, consistent interfaces, and reuse were the engineering concerns.
modernize.systems()Keep existing systems movingJun 2019 – Jun 2021
- Python
- Nuxt
- LibreNMS
Led the Python 2.7 to 3.11 migration across 50+ applications, re-platformed a B2B site, and built an alert transport for network incidents.
This work crossed application code and operations: changing old foundations, restoring testing standards, and making faults actionable.
Explore the alerting lab
ship.web()Connect the interface to deliveryJun 2021 – Jun 2023
- Vue / Nuxt
- REST APIs
- Testing
Implemented server rendering for a B2B website, integrated APIs with input validation, and established end-to-end tests for a residential platform redesign.
Rendering, validation, and release testing met in the same product. The work included defining MVP scope with cross-functional teams and testing the paths customers actually used.
connect.products()Make separate systems work togetherJun 2023 – Present
- React
- Python
- ServiceNow
Built integrations for ServiceNow, DocuSign, and Google Calendar, plus reusable React components backed by Wagtail CMS.
The scope extended beyond an individual feature: shared components, API listeners, architecture research, and mentoring engineers working across the stack.

The work continues in the experiments on this site. Explore the labs

Interactive portfolio

A different way to explore my work.

Ask about a project, browse the virtual filesystem, or inspect live site health. Commands and questions share one interface.

Eric Sekyere · Senior Software EngineerType any command or just ask a question — the terminal figures it out Tap a chip below, or type help to see everything available.