YH Yaakov Holdowsky
Full-stack software engineer · Jerusalem

I build secure, production‑grade systems for healthtech.

Full-stack engineer working across Python, TypeScript, React and AWS. At EyeContactDX I own the clinical reporting and physician portal applications that put an eye-tracking risk model to work in pediatric offices.

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Portrait of Yaakov Holdowsky
23pediatricians supported in production
2core production apps built and owned
RBACrole-based access and audit logging in the physician portal
AWSCognito, Lambda, DynamoDB, S3

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

  • End-to-end quoting workflows in React, TypeScript, Python and AWS, from application forms through quote retrieval and display.
  • Insurance business logic in Python that processes application data and builds requests to Majesco APIs.
  • Majesco API integration to retrieve quotes and present results to users in-app.

Selected work

Things I've built.

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

Ongoing · my own product

Kvius

The problem Studying Talmud means juggling the printed page, a translation and a dictionary.

What I built An interactive reader that keeps the printed page, line translations and word-level meanings in one place, covering Megillah, Berachos and Mesilas Yesharim, with more being added.

Interactive readerHebrew & Aramaic textTranslation + glosses
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.

StripeWebSocketsAWS S3Order tracking

Previously: I ran UXilityPRO, a web development business that built custom sites, business systems and integrations for small business clients.

Stack

Tools I work with.

Full-stack, with a focus on secure cloud architecture.

Languages & frameworks

PythonTypeScriptJavaScriptReactFlaskSQL

Backend & data

Data pipelinesMulti-tenant architectureAuthenticationPandas

Cloud & delivery

AWSLambdaDynamoDBS3EC2CloudFrontAPI GatewayDockerGitHub ActionsCI/CD

Rutgers Business School

B.S. in Finance

Class of 2017

App Academy

Full Stack Web Development

2021 – 2022

Contact

Let's talk.

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