Sameep Singhania, Blockchain Developer in New Delhi, Delhi, India
Sameep Singhania

Blockchain Developer in New Delhi, Delhi, India

Member since February 5, 2018
Sameep has a bachelor's degree in CS and has been a professional programmer for the past six years. He would characterize himself as a software developer, blockchain engineer, and consultant who loves to work on exciting new projects and meet new people from different cultures. That's why the idea of joining Toptal thrills him, freelancing would enable him to work on exciting development projects while seeing the wonders of the world.
Sameep is now available for hire




New Delhi, Delhi, India



Preferred Environment

VS Code, Bitbucket, GitHub, CentOS, Ubuntu

The most amazing...

...thing I've made was an appointment-&-EHR management system on blockchain for a healthcare entity; I did it all—the design, development, testing, and deployment.


  • Blockchain Developer

    2018 - PRESENT
    • Led a Blockchain development team.
    • Created user stories for a competition platform.
    • Designed competition smart contracts.
    • Implemented a token migration from ERC223 to ERC20.
    • Developed competition platform smart contracts.
    • Oversaw and was responsible for the integration of smart contracts with the core platform.
    • Worked as a panelist at IIT Bombay on Blockchain.
    • Spoke at the University of Malaya and Universiti Kuala Lumpur.
    • Attended the World Data Science Forum (WDSF) in Tokyo.
    Technologies: Truffle, Web3.js, Solidity, Ethereum
  • Freelance Blockchain Developer

    2018 - PRESENT
    OpenBazaar (via Toptal)
    • Integrated Ethereum-based payments (Ether and ERC20 tokens) in OpenBazaar.
    • Worked as part of the team in charge of updating wallet interface to support Ethereum in OpenBazaar.
    • Developed the infrastructure for OpenBazaar smart contracts.
    • Built a smart contract which included tokens, direct payments, escrowed payments, rewards, jury pools, and more.
    • Implemented the daily sync-up calls with other team members.
    Technologies: Go, Solidity, Ethereum
  • Freelance Blockchain Developer

    2017 - PRESENT
    • Built ERC20 tokens for multiple clients.
    • Developed crowdsales for multiple clients.
    • Created a green chain application.
    • Designed and developed a healthcare solution on Blockchain.
    • Designers the blockchain architecture for Stagewood, Inc.
    • Organized meetups.
    • Spoke about blockchain at various universities.
    Technologies: Hyperledger Fabric, Web3.js, Solidity, Ethereum
  • Smart Contract Engineer

    2019 - 2019
    Paraswap (via Toptal)
    • Designed smart contract for DEX aggregato.
    • Developed smart contracts. The smart contract breaks order as per algorithm into multiple orders and distributes them across different exchanges.
    • Developed a JavaScript library to interact with the smart contract.
    • Built a testing framework to test such smart contracts.
    Technologies: Web3.js, Node.js, React, Ethereum, Blockchain
  • Blockchain Developer and Consultant

    2018 - 2019
    • Developed ERC20 for the client.
    • Designed a complex token distribution.
    • Built a token distribution mechanism.
    • Audited ERC20 token for the client.
    • Audited a complex escrow contract for the client.
    Technologies: Truffle, Web3.js, Solidity, Ethereum
  • Smart Contract Developer

    2018 - 2018
    Deep Aero
    • Developed an ERC20 token.
    • Built a Crowdsale contract with five tiers including pre-sales.
    • Developed a token vesting contract.
    • Made recommendations to the client concerning the latest security practices when creating front-end apps.
    • Deployed smart contracts.
    Technologies: Solidity, Ethereum
  • Freelance Ethereum Smart Contract Consultant

    2018 - 2018
    Intellix (via Toptal)
    • Aided in the build of state channels.
    • Infested and comprehended a previously written smart contract for the above state channels.
    • Facilitated a client’s understanding of how the application works.
    • Devised a strategy for the team to work simultaneously on the smart contracts.
    • Set up a private network for development and testing purposes.
    • Communicated with clients via Skype calls.
    Technologies: Web3.js, Solidity, Ethereum
  • Freelance Blockchain Consultant

    2018 - 2018
    Stagewood, Inc. (via Toptal)
    • Built a Blockchain solution for the entertainment industry.
    • Helped the client to choose which blockchain platform to use as per the use case.
    • Designed the system architecture as to work with a Fabric design.
    • Set up Hyperledger-Fabric nodes.
    • Worked on an interactive ICO.
    • Involved in every othe day recurring meetings with client.
    Technologies: Hyperledger Fabric, Ethereum
  • Freelance Blockchain Developer

    2018 - 2018
    Akila Labs (via Toptal)
    • Designed and developed an Ethereum-based system for managing EHRs. The system consists of developing a private network on top of an Ethereum blockchain.
    • Built the entire system's architecture from blockchain to the front-end.
    • Read a MIT researcher's paper on MedRec.
    • Developed a smart contract architecture for the system.
    • Modularized a smart contract design.
    • Launched an Ethereum-based private network running on POA consensus algorithm (Clique).
    • Developed smart contracts for the system.
    • Created a test case for the smart contract.
    • Worked under Agile setting.
    • Was involved in daily Scrum meetings.
    • Led a team to integrate Blockchain-based smart contracts with other parts of the application.
    • Provided a few recommendations for the system which was very much appreciated.
    Technologies: Web3.js, Solidity, Ethereum
  • Software Developer

    2015 - 2017
    Drishti-Soft Solutions
    • Developed an omni-platform to help customer service desks to resolve customer's queries from various social media and traditional SMS and calls; all the platforms from one single product.
    • Organized technical training sessions related to web development.
    • Worked as part of the core technical team that developed the core tech stack.
    • Created a framework which allows third-party vendors to create apps on top of our product.
    • Designed and created a library similar to Redux on top of GWT. Was awarded the Boundary Breaker award for the same.
    Technologies: Hibernate, PostgreSQL, CSS, HTML, OSGi, GWT, Java
  • Service IT Developer

    2013 - 2014
    Dell International Services
    • Worked as part of the Skype test execution team.
    • Executed test cases and reported bugs.
    • Tested the Skype application on a varied range of devices and platforms.
    • Created a project for the team which allowed the team to keep all project-related documents in one single location. The documents were password protected and provided access depending upon the access level of the user.
    Technologies: Execution, Manual Testing


  • LOCK

    Lock is a protocol for safely storing your Ethereum assets in smart contracts.

  • Gasify

    Gasify allows DApp users to reduce their transaction cost using gas tokens.

  • Paraswap

    Paraswap is a DEX aggregator that has a very unique algorithm that breaks down the user order and sends them to multiple DEXs such as Uniswap, Bancor, and Kyber.

  • NovoPlexus

    NovoPlexus is building a Blockchain-driven, patient-centered healthcare marketplace. This marketplace will be based in the US—the New York Metropolitan area specifically. The idea is to develop the core platform and the supporting app layer that can be rapidly built and test in an iterative fashion.

  • Stagewood, Inc.

    A platform devoted to bringing innovative Blockchain technology and smart contract applications to the entertainment industry. It is the ground floor for a worldwide community working under virtual and physical platforms that directly connect fans, performers, and producers—streamlining the delivery of entertainment.

  • Million-dollar Ethereum Platform

    I developed a million-dollar product that allows users to put advertisements for their ICOs on an Ethereum blockchain. The user can buy the ad space on the canvas and display their ICO information. The ads are actually stored on the blockchain and displayed on the canvas using Web3.js.

  • Antriex ICO

    I developed entire ICO smart contracts for an upcoming exchange called Antriex.
    The smart contracts include:
    1. ERC20 token
    2. Private sale
    3. Angle investor vesting contract
    4. Public sale
    5. Founder vesting contract

  • Crowdsale DApp (End to End)

    I developed and an entire DApp (a decentralized app) for the crowd sales for my client. It includes an ERC20 token contract, a crowdsale contract, and the DApp which allows the user to purchase those tokens during crowd sales.

  • ERC20 Token for KOAN ICO

    I developed an ERC20 token as per KOAN specifications. I also consulted on how to proceed ahead with the ICO.

  • Smart Contract Audit

    I audited the smart contract for the Parsec team. The code contained many vulnerabilities. I marked them all and created a report for the same. The client was very happy with the results.

  • Smart Contract Code Auditing for the VTOS Team

    I audited an ICO smart contract for the VTOS team. The code contained many severe vulnerabilities. I then created a report and suggested possible solutions for the vulnerabilities. The client was very much happy with the results and added me to the team as a consultant.

  • Incident Dashboard

    I developed this project for a security company called Cybellum. It's a very user-friendly dashboard that allows users to view all the incidents found based on various parameters. Behind the scenes, it involves some complex APIs, data manipulation, and pagination.

  • Incident Report Management System

    In this project, the main task was to design a system around their current architecture to enable them to view reports about all the reported incidents based on categories. It also enables the user of the system to view and edit various parameters of the incident.

    Technologies: Node.js, Express.js, MongoDB, HTML, CSS, JavaScript

  • Chat Application | Chatty

    This is a simple chat application that allows a user to create rooms, join existing rooms, and chat within the room. It does not require any registration and users can join and leave at any time. It also supports file uploading and emoticons.

    Technologies: Node.js, Express.js, Socket.IO, Amazon S3, HTML, CSS, JavaScript

  • Internal Respository

    This is a web-based portal that allows team members to share files among themselves. It allows users to upload and download files. It supports folder hierarchy and the folders can be created or deleted. The portal also has proper authentication and authorization mechanisms in place.

    Technologies: JEE, Struts, Apache Tomcat, HTML, CSS, JavaScript


  • Languages

    Solidity, JavaScript, Java, Go, HTML, CSS
  • Frameworks

    Truffle, GWT, Express.js, OSGi, Hibernate
  • Libraries/APIs

    Web3.js, Node.js, REST APIs, React, Socket.IO
  • Tools

    Remix IDE, GitHub, Bitbucket, VS Code, Apache Tomcat, Dapper
  • Platforms

    Ethereum, Ubuntu, Blockchain, CentOS, Hyperledger Fabric, JEE
  • Other

    Smart Contracts, ERC20, ICO, Distributed Applications, Ethereum Smart Contracts, Loom, Quorum, Tron Blockchain, Execution
  • Paradigms

    Agile Software Development, Manual Testing
  • Storage

    MongoDB, PostgreSQL, Amazon S3 (AWS S3)


  • Bachelor of Technology Degree in Computer Science
    2009 - 2013
    JSS Academy of Technical Education (UPTU) - Noida, India


  • Blockchain Platforms (License DFFTR4RUARQ9)
  • Decentralized Applications (License M2KEKXGRVYS6)
  • Smart Contracts (License YUK9D9KWUMNW)
  • Blockchain Basics (License 9DZY96W5VU3Y)
  • Blockchain Specialization (License AZW3TTZD5BWL)
  • Ethereum Developer
  • IBM Blockchain Essentials
  • IBM Blockchain Foundation Developer
  • Full-stack Developer
  • Node.js Developer
    MAY 2017 - PRESENT
  • Machine Learning
    JUNE 2016 - PRESENT
    Stanford University via Coursera

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