I'm Josiah Coad. I founded Marky,
a GenAI product I scaled to 200K users / $2M, with our entire AI backend running on
LangStack at 10K+ daily invocations.
I've followed you from day one. I've built our company on your stack, collaborated with your team, and advocated for you throughout. This page shows how much I'd love to be part of your team.
A LangGraph agent, scoped to verified facts from my resume + proof inventory.
Anything I don't have a verified fact for →
josiah@coad.net.
Production walkthrough of how I use the LangStack
Loom · ~7 min
[Production walkthrough Loom coming]
Marky's multi-agent pipeline, the 50-tool LangGraph chatbot with full auth, our LangSmith eval / A-B-testing setup, and an honest field-feedback note on Prompt Hub.
How I Got Here
Below you can see the history I've had with y'all past couple years. Y'all have been amazing.
2026
May 12, 2026 · today
🦜
★ Application submitted
Deployed Engineer (Dallas) · LangChain
The seat where engineering, customer, and product all live in the same person. I've been operating in that intersection for free for a year and a half.
2025
December 2025
Shipped
50-tool LangGraph chatbot to production
ReAct agent with middleware, 50+ tools, multi-tenant DB access and authentication, file system read/write, cron, memory, and more.
November 2025
langchain-ai / langgraphjs · Discussion #489
Prompt Hub model resolution bug
Filed / discussed a production bug I hit on the LangGraphJS Prompt Hub.
View discussion →
September 2025 · 8 months ago
r/LangChain· u/josiahcoad · 6 threads
"I migrated my entire codebase to LangStack after doing it all myself for two years and it's changed everything. I'm just kicking myself for the two years wasted doing it myself rather than using the frameworks LangStack provides."
30-minute call on LGP pricing changes after billing went live. Discussed Marky's usage profile, what would scale, what wouldn't, and what would keep us on the platform.
July 8, 2025
📞
Field feedback session · Customer Engineering
Nithin Bose
60-minute working session. Five items captured as LGP / LangSmith roadmap: worker utilization monitoring, Prompt Hub SDK timeouts, "incomplete trace" tooltip, downloadable monitoring data, statistical analysis on custom charts.
July 2025
Josiah Coad·You
Technical-Founder of Marky | prev Tesla/Facebook SWE
10mo ·
Treating LangSmith Prompt Hub commits as feature flags. We A/B test
prompts in production with paired t-tests on real traffic instead of
vibes. …more
"Hi Josiah — I lead the GTM team here at LangChain. We're going to GA LangGraph Platform at Interrupt next week and wanted to give you a preview of pricing. Does anything work for you here? Would love to get your feedback before going live."
May 2, 2025
From: Harrison Chase <harrison@langchain.dev>
Re: LangSmith dashboards
"Adding in @Sam Noyes to help"
I absolutely love that Harrison jumped in — what founder is that involved?! That's CULTURE.
April 16, 2025
From: josiah@mymarky.ai · To: Chad Beatty
Re: trace ingestion + the bigger story
"Thanks! We 3x'd our approval rate of our content generation and doubled our conversion to paid after switching to langX. I'm a huge fan (and I would be happy to be a case study / testimonial for y'all)…"
2024
November 2024
★ The inflection
Migrated Marky's entire AI backend to the LangStack
After two years building agents the hard way. Single decision that shaped everything that followed: 3x approval rate, 2x conversion to paid, and the start of every event above.
2023
2023
Foundation
Founded Marky. Started following Lance Martin's videos and reading every LangChain / LangSmith release. Built AI workflows from scratch for ~18 months before the LangStack migration.
Talks & Teaching
~6 years ago I founded the largest data-science hackathon and taught at
it. I also trained Fortune-1000 teams through my company Coaded, LLC.
I'd love to teach LangStack and sponsor hackathons with y'all.
How to Win a Data Science Competition
TAMIDS · April 2020 · 36 min
What We Need in Data Science Education
Think Big Festival keynote · September 2019
Texas Datathon (promo)
Hackathon I founded · 3K students, $70K sponsors, top-10% MLH
The Ask
I feel like I'm already part of your team. I'd love to make it official and help take LangStack to the moon!
Applying for Deployed Engineer · Dallas
