Full-stack software engineer · Jerusalem

I build software end to end, from idea to production.

Full-stack engineer working across Python, TypeScript, React and AWS. I've shipped clinical software, insurance workflows, an online store and a Torah-learning platform, and I own the result from the first line of code to production.

Portrait of Yaakov Holdowsky
23pediatricians supported in production
2core production apps built and owned
~2 daysto put all 5,392 amudim of Shas online with my own pipeline
Firstpaying customers, onboarded on apps I built

Experience

Where I've shipped.

Regulated, high-trust software: clinical data, access control, and financial quoting.

Apr 2025 – Present
Israel

Software Engineer

EyeContactDX

  • Brought the risk model into clinical use. Engineered and launched two production applications supporting 23 pediatricians and enabling the company's first paying customers.
  • Clinical reporting app. Python, JavaScript and React. Generates individualized reports from eye-tracking data, supports clinical review and editing, and publishes to S3.
  • AWS physician portal. Secure report access built on Cognito, API Gateway, DynamoDB and S3, with role-based access control and audit logging.
  • Machine learning. Developed and benchmarked alternative risk-prediction models against the company's flagship model.
  • AI-assisted workflow. Built a structured development process with reusable project rules and automation hooks for planning, testing, code reuse and PR delivery.
  • Cross-functional. Work directly with executive leadership and clinical stakeholders to turn research, security and compliance requirements into maintainable systems.
Oct 2022 – Apr 2025
New York

Software Engineer

American European Insurance Group

  • Modernized online quoting. Helped replace an outdated, Internet Explorer–era quoting website with a modern, fast, professional quoting portal.
  • End-to-end quoting workflows in React, TypeScript, Python and AWS, from application forms through quote retrieval and display.
  • Insurance business logic and Majesco APIs. Python logic that turns application data into quote requests, and the integration that retrieves quotes and presents them in the portal.

Selected work

Things I've built.

Products of my own and for clients, built end to end.

Free for Klal Yisroel · my own product↗

Kvius

The problem I wanted my talmidim to have the literal meaning of every word, so fewer obstacles stood between them and learning how to learn.

What I built Every daf of Shas online and free, with an interactive reader that links words on the printed page to their text and meaning in context. A one-command pipeline built all of Shas in about two days.

All 38masechtos
5,392amudim
Freeno sign-up
Live demoMegillah 21b, the real printed pageTap any word · drag to explore
The same data kvius.com uses: 456 Gemara words and 283 Rashi words on this page, each linked to its exact place on the scan. Line translations: Steinsaltz, via Sefaria. Word meanings and Rashi translations: the Kvius pipeline.
AstroCloudflare D1 + R2Printed-page word mappingAI-assisted content pipeline
Client project · built via UXilityPRO

T&B Liquid Gold

The problem A boutique honey business needed to sell online through intense seasonal peaks.

What I built A full-stack store with Stripe payments, real-time order tracking over WebSockets, and S3 for assets. I ran it through high-volume holiday sales, then handed it to another developer to maintain.

The T&B Liquid Gold storefront homepage with the Shop Israel and Shop USA toggle
The live storefront, with separate Shop Israel and Shop USA catalogs.
StripeWebSocketsAWS S3Order tracking
My business · site I built

UXilityPRO

The problem Businesses want a professional website, and they want it fast.

What I built The site for my web development business. It leads with speed and quality, lays out services and a portfolio, and routes visitors to a free consultation, with light and dark modes.

The UXilityPRO homepage with the headline Transform Your Digital Future
uxilitypro.com, the studio's own site.
Marketing siteLight and dark modeConsultation funnel

Stack

Python · TypeScript · JavaScript · React · Astro · Flask · SQL · AWS (Lambda, DynamoDB, S3, Cognito, API Gateway, CloudFront, EC2) · Cloudflare (Workers, Pages, D1, R2) · Docker · GitHub Actions

Education

App Academy, Full Stack Web Development (2021–2022)
Rutgers Business School, B.S. in Finance (2017)

Contact

Let's talk.

Hiring, a project, or a question: send a message and I'll get back to you.