David Yahalomi
Co-Founder And CPO at Hypercore
Tel Aviv-Yafo, Tel Aviv District, Israel
Summary
🤩
Rockstar🎓
Top SchoolDavid Yahalomi is a fintech-focused product and engineering leader with 13 years of experience building production-grade lending and banking software. As Co-Founder and CPO at Hypercore he combines product strategy, credit-risk workflow design and client success to deliver an end-to-end platform for non-bank lenders. He previously co-founded Articode and shipped mobile and web banking apps — including leading iOS work for Pepper Bank — blending hands-on development with go-to-market execution. A seasoned full‑stack developer and open-source contributor, David has implemented GraphQL subscriptions with Redis and improved widely used JS auth tooling, demonstrating attention to scalability, typing, and security. His background includes systems architecture and ESB work in the Israeli Air Force, giving him deep experience in resilient integrations and operational rigor. Based in Tel Aviv and a Y Combinator alum, he pairs startup grit with disciplined engineering practices to turn complex fintech requirements into usable products.
13 years of coding experience
11 years of employment as a software developer
S21, S21 at Y CombinatorGraduate Computer Science, Graduate Computer Science at MAMRAMComputer Science, Computer Science at Gimnasia Realit
Hebrew, English
Stackoverflow
1,940reputation
61kreached
8answers
0questions
javascript
top-5%
graphql
top-1%
Github Skills (39)
javascript10
useraccounts10
flow-control10
redis10
testing10
work-flow10
typescript10
authentication10
user-authentication10
accountsservice10
wpgraphql10
workflow-automation10
wordpress-graphql10
control-flow10
typescript-types10
Programming languages (7)
Github contributions (5)
davidyaha/graphql-redis-subscriptions
Sep 2016 - Dec 2022
A graphql subscriptions implementation using redis and apollo's graphql-subscriptions
Role in this project:
Back-end Developer
Back-end DeveloperContributions:8 releases, 1 review, 267 commits in 6 years 4 months
Contributions summary:David implemented the initial working implementation of a GraphQL subscriptions implementation using Redis and Apollo's `graphql-subscriptions`. They wrote the core logic for publishing and subscribing to Redis channels, along with unit and integration tests. The user addressed a fast subscription rate issue and expanded the tests with benchmark cases.
apollographql-subscriptionsredisredis-subscriptionsgraphql
accounts-js/accounts
Dec 2016 - Jun 2020
Fullstack authentication and accounts-management for Javascript.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:1 release, 180 commits, 69 PRs in 3 years 6 months
Contributions summary:David primarily contributed to the project by adding type declarations, ensuring compliance with ESLint and Flow checks, and refactoring the accounts error class. They fixed a library name in the webpack configuration and corrected lint errors. The user also made several updates to the project's typings and added token storage, demonstrating a focus on code quality, maintainability, and security.
authenticationfull-stackjavascriptaccountsoauth
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