Diogo Almeida

Career

Almeida's past roles include work at Google Brain and at OpenAI. In TypeSafe's launch post, Almeida writes of helping build, at OpenAI, the methods that made language models follow instructions and talk with people, and Almeida is listed among the authors of the March 2022 InstructGPT paper.¹³²

Almeida founded TypeSafe AI and leads it as CEO, alongside COO Sasha Sheng and CTO Erik Gafni. The launch post says the company spent two years in stealth before its public debut.¹³

TypeSafe AI and Jev

On September 15, 2026, Almeida announced Jev, TypeSafe's first System One model, in early access. The post describes a new model architecture, a parallel sampler and a training method the company calls Reinforcement Learning for Calibrated Decisions (RLCD), with Jev returning structured decisions instead of free-form strings.³

The same post introduced TypeSafe's workflow evaluations, which break automation tasks such as security incident triage, invoice processing and customer service into narrow typed questions and compare models against consensus labels.³⁴

Work and contributions

• WorkflowEvals (TypeSafe AI) Open-source code

  Wrote TypeSafe's launch post, which introduced the company's workflow evaluations and pointed readers to the workflow evals site with its examples, queries and workflows.³⁴

• InstructGPT Published research

  Co-author of the 2022 paper that fine-tuned GPT-3 with supervised demonstrations and reinforcement learning from human feedback to produce the InstructGPT models.²

Timeline

1. Mar 2022Co-authored the InstructGPT paper on training language models with human feedback.²
2. Sep 15, 2026Announced TypeSafe AI's first System One model, Jev, in early access.³
3. Sep 15, 2026Introduced TypeSafe's workflow evaluations in the Jev launch post.³

Other documented roles

Roles the sources document that are not confirmed as current.

• Researcher on instruction-following language models (past), OpenAI³²
• Past role listed on TypeSafe's team page, Google Brain¹

Where they work

• TypeSafe AI 3 people in the wiki

Related people

• Sasha ShengAlso at TypeSafe AI
• Erik GafniAlso at TypeSafe AI
• Ian R. McKenzieSafety and alignment · Evaluation and benchmarks
• Aylin CaliskanSafety and alignment · Evaluation and benchmarks
• Saadia GabrielLanguage models · Safety and alignment
• Eric Michael SmithSafety and alignment · Evaluation and benchmarks
• Owain EvansSafety and alignment · Language models
• Ethan PerezSafety and alignment · Evaluation and benchmarks
• Margaret MitchellSafety and alignment · Evaluation and benchmarks
• Samuel R. BowmanSafety and alignment · Evaluation and benchmarks