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Sebastian Messier

Founder / Developer

About

Full-Stack Developer and Founder spanning FinTech, Health Tech, Retail Banking, and Software Consulting. Proven track record of launching startups, fundraising, and building things people need.

Skills

Frontend: React, Next.js, TypeScript, Ruby on Rails, Tailwind, Redux, WebGL, D3.js
Backend: Node, Typescript, Deno, JavaScript, Ruby on Rails, Python, Docker, AWS, DynamoDB, ECS, Kubernetes, Lambda, CDK, SQS, Kafka, Postgres, GraphQL, Datadog
Design & Business: Sketch, Figma, Prototyping, User Research, Marketing, SEO, Recruiting

Work

F2'24 Batch @ Recurse Center
Programming retreat focused on self-directed learning and collaboration recurse.com
Attended a 3-month programming retreat focused on collaborative learning and working at the edge of my abilities. Worked on several projects including rebuilding React from scratch, iOS keyboard prototypes, and serverless infrastructure.
  • Made first open source contribution to Deno, adding port validation handling (#24399)
  • Built Rebuilding React, an educational walkthrough of React internals.
  • Developed an iOS keyboard with dynamic key mapping based on natural finger placement.
  • Created a FaaS platform with Docker-based resource limitations and Deno runtime isolation.
  • Built a Tetris Attack clone with HTML Canvas and experimented with AI/ML gameplay approaches.
CEO @ SBMSR Software Solutions LLC
End-to-End Software Development & Consulting
I help early-stage startups go from concept to deployed product. I also help with technical & strategic planning, UX design & research, and hiring.
  • Designed, coded, and launched a M&A workflow management SaaS for a NY FinTech startup.
  • Developed two-sided marketplace for luxury watch retailer; led design, development, and hiring.
  • Built platform to give students practical real-world software skills by working on real codebases.
  • Grew a YouTube channel focused on tech education to >1.5k subscribers and +60,000 views.
  • Built laser management system (inventory tracking, scheduling) for a medical device company.
Software Engineer @ Capital One
Technical Lead @ Fortune 100 Bank capitalone.com
Built, maintained, and extended customer-facing technology powering Capital One branches.
  • Architected & built customer checkin API, reducing avg. checkin time by 25%.
  • Built customer feedback collection into our app to enable user-centric product roadmap.
  • Developed GovID Verification via iPad camera barcode scanning to prevent fraud.
  • Established best practices to speed up dev onboarding and maintain code quality.
Founder, CTO @ Doorbell Health
Health Care SaaS Startup doorbellhealth.com
As a sleep apnea sufferer, I started Doorbell Health to streamline the tedious CPAP patient experience. Built a team and raised seed funding to tackle this problem.
  • Led the development of products from ideation, customer feedback, and deployment.
  • Scouted, hired, and managed a distributed team of 6 engineers.
  • Grew company's MRR from 0 to over 18k in one year.
  • Successfully raised 2.5M in seed funding from high-profile investors (Bling, Apollo, Justin Kan).
Software Engineer @ flexEngage
SaaS Retail Startup flexEngage.com
Contributed during a period of hyper-growth at a YC-backed digital receipts startup, onboarding major clients and building new features.
  • Scaled the product (transition from monoliths to microservices) during a period of 10x growth.
  • Onboarded major clients like Under Armor, Michael Kors & Grupo Exito.
  • Managed product catalog ingestion, syncing millions of items to our systems on a weekly basis.
  • Organized meetings to solve issues faced by internal customer facing non-tech teams.
Diagnostics Engineer @ Apple
AppleCare Department apple.com
Interned at Apple's hardware diagnostics department, combating fraud by identifying counterfeit phones via hardware diagnostic tests.
  • Authored diagnostic suites for iPhone 6/6+ microphone & speakers using Matlab/Lua/Obj-C.
  • Developed data collection tool to gather and organize test results at scale using Python.
  • Built diagnostic & enclosure for iPhone 6+ optical image stabilization autofocus failure detection.

Education

University of Pennsylvania B.S.E in Comp. Sci.