Ethan Cohen

CTO

Brooklyn, New York, United States10 yrs 11 mos experience

Highly StableAI Enabled

Key Highlights

Expert in building 0→1 platforms and developer tooling.
Proven track record in driving high-impact engineering initiatives.
Strong leadership in both startups and large-scale environments.

Stackforce AI infers this person is a Full-Stack Engineering Leader in Healthcare and Social Media sectors.

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Skills

Core Skills

Full-stack DevelopmentTypescriptReact

Other Skills

Next.jsNode.jstRPCFastifyPrismaPostgreSQLPlanetScaleInngestGraphQLDeveloper ToolingExperimentation SystemsHealthcare EHRsInsurance & Billing InfrastructureAI-powered Internal Tools

About

CTO and first engineer at Tono Health. Former Staff Software Engineer at Twitter. 12+ years of experience building 0→1 platforms, developer tooling, experimentation systems, healthcare EHRs, insurance & billing infrastructure, and AI-powered internal tools. Expert in TypeScript, React/Next.js, Node, tRPC, and product-minded engineering. Known for rapidly increasing engineering velocity, designing robust architectures, and driving high-impact, cross-org initiatives in both early-stage startups and large-scale consumer environments.

Experience

10 yrs 11 mos

Total Experience

7 yrs 2 mos

Average Tenure

3 yrs 9 mos

Current Experience

Tono health

Chief Technology Officer

Aug 2022 – Present · 3 yrs 9 mos · Brooklyn, New York, United States

CTO and engineer #1 at Tono Health, working across full-stack product development, platform architecture, and internal tooling. Built and maintained a TypeScript monorepo powering multiple applications and services, using React, Next.js, Node.js, tRPC, Fastify, Prisma, PostgreSQL/PlanetScale, and Inngest for workflow orchestration.
Focused on system design, developer experience, and building scalable, reliable infrastructure for clinical workflows, analytics, and partner integrations. Lead and manage a small engineering team, setting technical direction, establishing code review and engineering standards, and supporting high-quality execution across projects. Collaborate closely with product, operations, and clinical teams to deliver end-to-end features across the stack.

TypeScriptReactNext.jsNode.jstRPCFastify+5

Twitter

Staff Software Engineer

Jun 2015 – Aug 2022 · 7 yrs 2 mos · New York City Metropolitan Area

Tech Lead & Staff Software Engineer working across full-stack systems on Twitter’s Web and Experimentation teams. Built and maintained large-scale frontend and backend architecture using React, TypeScript, Node.js, GraphQL, and internal service frameworks. Worked on high-leverage internal tooling and experimentation platforms that supported product teams company-wide.
Focused on developer experience, performance, reliability, and modernizing core systems (strong use of TypeScript, schema-driven development, service interfaces, and platform consistency). Collaborated closely with infra and product teams, led design reviews, mentored engineers, and contributed to engineering standards across the org.

ReactTypeScriptNode.jsGraphQLFull-Stack Development