Head of R&D at Bring · Petah Tikva, Israel

Daniel Kalfa.Full-Stack Developer

I build products end to end - from browser extensions and React frontends to Node.js services running on AWS. I care about clean code, fast interfaces and shipping things that work.

Get in touchGitHubLinkedIn
TypeScriptReactNext.jsNode.jsAWSDockerPostgreSQLSupabaseTailwind CSSChrome ExtensionsServerlessLLM APIs
01

About

I'm a full-stack developer who has spent the last few years taking products from idea to production. At Bring I grew from full-stack developer to Head of R&D, building the product and managing infrastructure that serves millions of users.

Before that I was CTO of Jambo Music, where I led a music-sharing platform from concept to launch and solved problems like zero-latency playback of multiple audio tracks in the browser. I also spent a year mentoring 30+ junior developers through a full-stack bootcamp.

5+Years building software
MillionsUsers served by infrastructure I manage
30+Developers mentored
-60%Infra costs after my serverless migration
CurrentlyHead of R&D at Bring, shipping web apps, browser extensions and the cloud behind them.
GitHub activity@kalfada

519 contributions in the last 26 weeks

Based in
Petah Tikva, Israel
02

Skills

Frontend

  • TypeScript
  • React
  • Next.js
  • Tailwind CSS
  • Chrome Extensions
  • HTML5 / CSS

Backend

  • Node.js
  • Express
  • Python
  • PostgreSQL
  • Supabase
  • MongoDB
  • REST APIs

Cloud & DevOps

  • AWS
  • Serverless
  • Docker
  • CI/CD (GitHub Actions)
  • Linux
  • Vercel

AI & Tooling

  • LLM APIs (Claude, OpenAI)
  • AI-assisted development
  • Prompt engineering
  • FFmpeg
  • Git
03

Experience

  1. Head of Research & Development · Bring

    Apr 2026 - Present
    Israel
    • Leading R&D for a white-label cashback platform, managing infrastructure that serves millions of users.
    • Owning architecture and technical direction across web apps, browser extensions and backend services.
    • TypeScript
    • React
    • Node.js
    • AWS

  2. Full-Stack Developer · Bring

    May 2024 - Apr 2026
    Israel
    • Built the product end to end: browser extensions, React frontends and Node.js services on AWS.
    • Shipped features across the entire stack, from extension internals to serverless APIs.
    • TypeScript
    • Chrome Extensions
    • React
    • Node.js

  3. Full-Stack Mentor · Migo

    Sep 2023 - May 2024
    Jerusalem
    • Mentored 30+ students and led a full-stack bootcamp from fundamentals to deployment.
    • Lectured on Git and GitHub, frontend development and clean code.

  4. Chief Technology Officer · Jambo Music

    Aug 2022 - May 2024
    • Owned the development lifecycle of a music-sharing platform from concept to production.
    • Engineered a zero-latency multi-track audio player in the browser.
    • Cut infrastructure costs by 60% by moving workloads to serverless.
    • React
    • Express
    • AWS Lambda
    • MongoDB

  5. IT Engineer · Ezra Computer Solutions

    Jul 2019 - Aug 2023
    Jerusalem
    • Diagnosed and repaired hardware and software issues under tight client deadlines.
    • Built an internal CRM that streamlined workflows and lifted team efficiency by 40%.
04

Education

2021 - 2022

workin - Cyber & Code College

Full-Stack Development

2020 - 2021

SVCollege

Game Development

2019

The Open University of Israel

Computer Science

05 · Contact

Want to talk code, ideas or tech?Let's connect.

My inbox is always open, whether it's a question, an idea or just to say hi.

kalfada3321@gmail.com