Mark Sherriff

ORIGIN STORY

AGE 11 → 2020

AGE 11
Got my first computer for Christmas.
AGE 12
Created a minecraft server with my friends.
AGE 14
Built and released my first iOS/Android (native) app.
2017
Grade 12 computer science class
2020
Computer Programming Diploma · Humber College, Toronto

APN Lodging (Hawaii - Remote)

Freelance Flutter Developer

2021–2022

Sole developer of a production rental-management app
10 properties, with 30+ users a month.
Co-designed, then built for iOS and Android with Flutter
Cut check-in time by 35%, check-out time by 20%, and admin tasks by 50%.

"I would highly recommend Mark to any business owner wanting to find ways to leverage technology to improve their processes, or to create an app or platform to expand their reach and impact."

— Lia Bosch, client

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GOODKIND (Toronto)

Mobile and AI Engineer

2022–2025

Early hire at Y-Combinator backend startup, working directly with the COO
Owned the Flutter app end-to-end
Led a team of 2 interns
Built AI chatbot from zero to production
- LLM chain that included RAG with Pinecone, Node, and TypeScript.
- Grew to ~20 customers with 1,500 chat messages a week

"Hand Mark a project with little definition and he'll come back with something shipped. I look forward to working with Mark again."

— Michael Warshafsky, COO

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NICHE (AQUIRED GOODKIND - Pittsburgh)

Full-Stack and AI Engineer

2025–2026

Owned the mobile app through acquisition
Handed off AI chatbot I built to a 7-person team
Learned Go Lang to help build a new AI messaging product for 2,000 client institutions
Expanded frontend skills with React

"Mark is very smart, takes pride in his work, is a team player, ask the right questions, and any team would be glad to have him."

— Tyler McDowell, teammate

See full rec >

ORIGIN STORY

APN Lodging (Hawaii - Remote)

GOODKIND (Toronto)

NICHE (AQUIRED GOODKIND - Pittsburgh)

LANDED IT!
WHAT TRICK IS NEXT?

LANDED IT! WHAT TRICK IS NEXT?

MARK SHERRIFF

LANDED IT!
WHAT TRICK IS NEXT?