Diogo Almeida at a glance
Fact | Detail |
|---|---|
Role | Co-founder and CEO of TypeSafe AI since 2024 |
Full name | Diogo Moitinho de Almeida |
From | Born in the Philippines (Sequoia); lives in San Francisco |
Education | Georgia Institute of Technology, as listed on his LinkedIn |
Before TypeSafe AI | OpenAI (about 2020–2024); Google Brain; Enlitic |
Known for | Co-authoring OpenAI’s InstructGPT paper, the research behind ChatGPT |
No current address published; X is his main channel | |
X |
TypeSafe AI CEO email address: how to reach Diogo Almeida
Almeida hasn’t published a work email address. He posts most on X, as @CompleteSkeptic, where he has about 158,000 followers, and is on LinkedIn with about 41,000. The only address he has posted himself is a personal one in the README of a 2014 code project, ten years before TypeSafe, so we don’t show it. For the company, sales@typesafe.ai and press@typesafe.ai are the routes it publishes. TypeSafe AI staff use {first}@typesafe.ai, such as maya@typesafe.ai for a fictional Maya Chen. Addresses at typesafe.com belong to a different company, the Scala and Akka business once called Typesafe.
Channel | Address | Note |
|---|---|---|
X | @CompleteSkeptic | About 158,000 followers; where he announces launches |
linkedin.com/in/diogomda | About 41,000 followers | |
GitHub | github.com/diogo149 | Mostly older projects |
Company | sales@typesafe.ai, press@typesafe.ai | TypeSafe AI’s published inboxes |
TypeSafe AI email address pattern
Format | Example (fictional name: Maya Chen) | Who uses it | Status |
|---|---|---|---|
{first}@typesafe.ai | maya@typesafe.ai | The founders and every staff address published so far | Standard |
{first}.{last}@typesafe.com | maya.chen@typesafe.com | Staff of the old Scala company Typesafe, now Akka | Not TypeSafe AI |
Before emailing any pattern-based address, run it through a verifier: a bounce hurts deliverability for every later send. All TypeSafe AI patterns and official inboxes are on the TypeSafe AI email format page.
Need verified CEO emails at scale? The LeadWave SaaS companies list has hand-checked CEO contact details for 15,000+ SaaS companies in one CSV.
Career timeline
Date | Milestone |
|---|---|
Oct 9, 2026 | TypeSafe AI raises $870 million at a $7.5 billion valuation (TypeSafe AI) |
Sep 15, 2026 | Launches Jev and a $40 million seed round (X) |
2024 | Leaves OpenAI and co-founds TypeSafe AI |
Mar 2022 | Co-authors the InstructGPT paper (arXiv) |
2020 | Joins OpenAI |
2017 | Research engineer at Google Brain (GOTO) |
Until early 2017 | Senior data scientist at Enlitic, a medical-imaging AI startup (TWiML) |
2013 | Wins a Kaggle competition on detecting cause and effect in data |
2008 | Bronze medal at the International Mathematical Olympiad for the Philippines (IMO) |
How Diogo Almeida built TypeSafe AI
Almeida competed for the Philippines at the 2008 International Mathematical Olympiad and won a bronze medal, and later won a Kaggle machine-learning competition. He worked as a data scientist at Enlitic, which applied deep learning to medical images, and as a research engineer at Google Brain, then spent about four and a half years at OpenAI. There he co-authored the InstructGPT paper and the GPT-4 technical report and worked on the RLHF research behind ChatGPT (AI Council). He and TypeSafe describe him as a co-inventor of RLHF and ChatGPT; the method itself predates InstructGPT.
He left OpenAI in 2024 convinced that chat models, tuned to please people, would not by themselves automate work. “Models have been superhuman at chat for years, so where is all the automation?” he wrote at launch. He recruited Erik Gafni first, then Sasha Sheng, who folded her own startup to join, he said on the Latent Space podcast (Latent Space). After two years in stealth, TypeSafe launched Jev in September 2026 and raised $910 million within five weeks.
Diogo Almeida’s net worth and age
Neither Forbes nor Bloomberg publishes a net-worth estimate for Almeida, and we don’t estimate one; TypeSafe AI is private and the founders’ stakes aren’t public. No published source gives his age.
In his own words
“After co-inventing ChatGPT, I kept asking myself: why have superhuman chat models not led to AGI?”
— Diogo Almeida, launching Jev, September 15, 2026
“We have lightning in a bottle, and yet it is not useful.”
— Diogo Almeida, TechCrunch, September 18, 2026 (TechCrunch)
“In a world where AGI has automated most of the economy, over 99% of AI calls will be made by and for software, not humans.”
— Diogo Almeida, September 2026 (DCVC)
“The bitterest lesson in ML is that doing the right task > data > compute > algorithms.”
— Diogo Almeida, September 10, 2026 (TypeSafe AI)
“We all know intelligence is spikey/jagged - but do we know _why_ it is?”
— Diogo Almeida, September 11, 2026 (X)
TypeSafe AI’s founders
TypeSafe AI’s team page lists three founders (TypeSafe AI); a16z’s Martin Casado joined the board in October 2026.
Person | Role |
|---|---|
Diogo Almeida | Co-founder and CEO; formerly at OpenAI, a co-author of InstructGPT |
Erik “Spock” Gafni | Co-founder and CTO; leads model training and go-to-market |
Sasha Sheng | Co-founder and COO; formerly a research engineer at Meta/FAIR |
TypeSafe AI’s funding, product and competitors are on the TypeSafe AI company profile.
