Joshua Constantine Santos

I am a senior fullstack engineer with a passion for building, learning and collaborating with others. Started my journey in coding when I was 10 years old, scripting and making games in Roblox and accidentally learning about OOP.

• Senior fullstack engineer, MedBridge March 2026 - Present

  • Building healthcare software, from figuring out what people need to getting it into their hands. Recently worked on patient-reported outcomes controls for organizations and clinics.
  • Making agents follow the same rules as the rest of us: tickets, tests, and code review. They need a second pair of eyes too.
  • Working with design on shared components that are easier to use with a keyboard.
• Fullstack engineer, American Express June 2024 - February 2026

  • Helped releases catch their own configuration mistakes before deployment. Fewer surprises for the people keeping things running.
  • Got search queries from about a minute to under 100ms, then added caching. Less waiting around.
  • Worked on the frontend with TypeScript, reusable UI patterns, and accessibility in mind.
• Fullstack engineer, Kipsi Software October 2023 - March 2024

  • Identified and improved unnecessary repetitive re-renders in core hot routes
  • Implemented easy shareable views by enhancing search, sort and table functions
  • Improved user experience by leveraging NextJs by migrating heavy client-side calculations to the server
• Fullstack engineer, SoftLedger August 2021 - September 2023 1st engineering hire

  • Rewrote the api-gateway node service to golang, improving efficiency and reducing latency for all api requests. 10x smaller containers & 3x more throughput
  • Led the transition from Javascript to Typescript
  • Built an MVP to integrate all of customer's cryptocurrency transactions to the accounting general ledger
  • Improved frontend build times by 10x, reduced build size by 5x
  • Improve backend validation and user error messages, the friendlier messages reduced related customer issues
• Fullstack engineer, MNNML Health August 2020 - March 2023 1st engineering hire

  • Restructured monoservice architecture to microservices using AWS EKS
  • Transitioned Javascript repo to Typescript. Used tRPC to enable backend to frontend typesafety.
  • Reduced backend code by 65%, reduced build times by 2x.
  • Improved backend response times by improving sql queries and better PostgreSQL indexes, reducing responses from >800ms to 95% sub 20ms

• Barbenheimer

  Barbenheimer on GitHub

  Typescript, React, NextJs, Tailwind, tRPC, jotai, ShadCN, Zod, Vercel, Drizzle, Planetscale, Postgres, Supabase, Cloudflare

  With the craze with Barbie and Oppenheimer dropping on the same day. I wanted to make a funny joke about if it were like the US elections complete with an Electoral College map. Unfortunately, someone figured out how I would check unique votes, and started to cheat

• Foodtok

  Foodtok on GitHub

  Typescript, React, Tan-Query, Tan-Table, React-Router, Firebase, Axios, Tailwind, Recoil, Supabase, Vite, Docker, Express, Postgres, Google Cloud Platform

  It was difficult to find tiktok recipe videos that I saved for later. The project's goal was copy the video url, embed the video, and get the title and description. Then later, if I want to look for "shrimp", I'd get all the related videos I also made my own little schema validator, but zod is SOOO much better

• Hive Codes

  Hive Codes on GitHub

  Typescript, React, NextJs (App Router), Tailwind, Tan-Query, Drizzle, Open-Props, Zod, Postgres, Neon

  Next App Router at the time was in beta, same with the server actions. I wanted to explore what React Server Components (RSC) could do. I also wanted to explore pg_trgm, to do some typo-tolerant text searches. Tested out Open Props to help with the styling. RSC is very cool, excited to see what more it can do in the future

• Some Chat App

  Some Chat App on GitHub

  Typescript, React, NextJs, Turbo, Tailwind, tRPC, jotai, Fastify, Upstash, Redis, Vercel, Railway

  I wanted to explore more about real-time, monorepos, and redis. Picked between server-side-events and websockets, went with the latter. It was cool running all the apps at once with turbo, and also using Upstash (redis) as the "database". I know, using redis as the database is bad

• Grand Canyon University, Computer Programming

  August 2016 - April 2021

• Hack Reactor, Software Engineering Bootcamp

  April 2021 - July 2021