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Daniel Mercer

Senior Full-Stack Engineer

I build web applications that scale.
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About Me

I'm a full-stack developer with 8+ years of experience building web applications that solve real problems. I'm passionate about clean architecture, developer experience, and open source. When I'm not shipping code, I'm probably contributing to OSS projects or writing about software design patterns.
I've made 4,200+ GitHub contributions this year
My dotfiles repo has more stars than my actual projects
I debug production issues in my dreams (seriously)
I once refactored a codebase on a 14-hour flight

Experience

Senior Full-Stack Engineer
TechScale Inc.
Mar 2021 — Present · San Francisco, CA (Remote)
Lead engineer on the core platform team, owning the migration from a Rails monolith to a Node.js + Go microservices architecture serving 50K+ concurrent users. Cut p95 API latency by 60% and shipped a real-time sync layer with zero production incidents over 18 months.
Node.js Go React PostgreSQL AWS
Full-Stack Developer
DataFlow Systems
Jun 2018 — Feb 2021 · Austin, TX
Built and maintained the customer-facing analytics dashboard used by 200+ enterprise accounts. Introduced a TypeScript design system and CI pipeline that reduced regression bugs by 45% and shipped a GraphQL API layer adopted across three product teams.
TypeScript React GraphQL Redis Docker
Software Engineer
Brightline Labs
Aug 2016 — May 2018 · Denver, CO
Joined as the third engineer at an early-stage SaaS startup. Built the billing, authentication, and onboarding flows on a PHP/WordPress + Vue.js stack, helping grow the product from 0 to 12K active users.
PHP WordPress Vue.js MySQL Stripe

Skills

Contribution activity

Sample activity — illustrative only, not live GitHub data

Frontend

React / Next.js 95%
TypeScript 90%
CSS / Tailwind 92%
Vue.js 80%

Backend

Node.js 90%
PHP / WordPress 85%
PostgreSQL 85%
REST APIs 88%
LLMs / RAG 80%

DevOps

Git / GitHub 95%
Docker 78%
AWS 82%

Featured Projects

CloudSync SaaS Platform

CloudSync SaaS Platform

A multi-tenant SaaS platform for real-time file synchronization across devices. Built with a microservices architecture handling 50K+ concurrent connections with sub-100ms latency.

React Node.js PostgreSQL Redis Docker
Live Demo Source
FormKit — Open Source Library

FormKit — Open Source Library

A headless form validation library for React with 2.8K GitHub stars. Declarative API, tree-shakeable, zero dependencies, and full TypeScript support.

TypeScript React Rollup Vitest
Live Demo Source
DevFlow CLI

DevFlow CLI

A developer productivity CLI that automates git workflows, manages environment configs, and scaffolds project templates. 15K+ monthly npm downloads.

Node.js Commander.js Chalk Inquirer
Live Demo Source
PayStream API Service

PayStream API Service

RESTful payment processing API with support for subscriptions, invoicing, and multi-currency transactions. PCI DSS compliant with 99.99% uptime.

Go PostgreSQL gRPC Kubernetes
Live Demo Source
RepoSage — Codebase Q&A Assistant

RepoSage — Codebase Q&A Assistant

A RAG-powered assistant that answers natural-language questions about any codebase. Chunks and embeds repositories into a pgvector store, retrieves the most relevant context, and grounds an LLM's answers with file citations — cutting onboarding time for new engineers from days to minutes.

Python LangChain OpenAI pgvector FastAPI
Live Demo Source

By the Numbers

120+ Projects Shipped
4,200+ GitHub Contributions
2,800 GitHub Stars Earned
350+ Pull Requests Merged

Certifications

AWS Certified Machine Learning – Specialty

Amazon Web Services Feb 2025

Generative AI with LLMs

DeepLearning.AI Sep 2024

What People Say

One of the most talented engineers I have worked with. They delivered a complex microservices migration on time and under budget, with zero production incidents.
Sarah Chen
Sarah Chen VP of Engineering , TechScale Inc.
Their open-source library saved our team hundreds of hours. Clean API, excellent documentation, and they actively respond to issues. A real community asset.
Marcus Rivera
Marcus Rivera Senior Developer , OpenStack Labs
They don't just write code — they architect solutions. Our platform's performance improved by 300% after their optimization work.
Emily Watson
Emily Watson CTO , DataFlow Systems

Get In Touch

Let's build something great together.

Have a project in mind, an open-source idea, or a role you think I'd be a fit for? Drop me a message and I'll get back to you within one business day.

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