Erez Haim, Developer in Tel Aviv-Yafo, Israel
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Erez Haim

Verified Expert  in Engineering

Software Developer

Tel Aviv-Yafo, Israel
Toptal Member Since
December 4, 2017

Erez is an expert in building end-to-end products; taking projects from abstract ideas to high scale production. Over the past three years, he has built a web application from scratch that is now used by over 100,000 users.



Preferred Environment

Git, PyCharm, MacOS

The most amazing...

...platform I've built is my latest startup, a web application that helps close deals by allowing document signing and identity verification in real time.

Work Experience


2014 - PRESENT
  • Planned and created the company's REST API using Django framework. The API allows conversion of regular PDF files into web based sessions where two (or more) parties can edit and sign the original PDF document. The API also allows retrieving information about the sessions including digitally signed documents and real-time updates using web hooks.
  • Developed the company's web application using Angular JS. The application is a complete platform that allows the user to upload PDF documents and convert them to HTML based templates. Users can then send these documents for signing or invite the signer to a real-time session where both can edit and sign the document while seeing each other using webRTC based video.
  • Built the company's iOS application using Swift. A native iOS application that uses company's REST API and co-responds with web application in order to allow fully featured experience using native app.
  • Deployed the product using Kubernetes and Docker. Allowing the product to be deployed on both cloud based environments and on-premises installations in a fast, stable and monitored way.
  • Led the entire development and technology of the company. Was responsible on a team of 4.
  • Provided technical support for company's clients. Anything from complicated API integrations to helping clients using the web application.
Technologies: Swift, AngularJS, JavaScript, Django, Python

Software Engineer

2010 - 2014
  • Developed browser add-ons for Chrome, FireFox, Internet Explorer, and Safari. The main add-on is a community toolbar allowing users to share information and get updates from their favorite websites.
  • Built the product API to allow 3rd parties to develop extensions for the company's toolbar leveraging the 200 million users in the community.
  • Planned, specified, and developed the desktop application. As a special project, created prototype for new product from scratch. The application allowed installation of the company's toolbar directly on desktop (no browser needed) using the Chromium project.
  • Received three awards for outstanding work.
Technologies: JavaScript

Seegnature Platform
A web platform that facilitates deal closure phase of remote transactions.

The platform allows remote Identity verification and electronic signature of documents, in real time.
2007 - 2012

Bachelor of Science Degree in Computer and Electrical Engineering

Hebrew University of Jerusalem - Jerusalem, Israel


Toptal React Native Academy

Toptal Academy


OpenCV, jQuery


Git, Gulp, PyCharm


Django, AngularJS, React Native


Kubernetes, OpenTok, Azure, AWS Elastic Beanstalk, MacOS, Linux


JavaScript, Python, CSS, SCSS, HTML5, Swift


PostgreSQL, MySQL


Software Development, Full-stack

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