Constantin Zemelman

Principal Software Engineer - Fiat To Crypto payments at Okcoin
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Contact Information
us****@****om
(386) 825-5501
Location
New York City Metropolitan Area

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Experience

    • United States
    • Financial Services
    • 100 - 200 Employee
    • Principal Software Engineer - Fiat To Crypto payments
      • Jan 2022 - Present

    • United States
    • Financial Services
    • 400 - 500 Employee
    • Staff Software Engineer - Wallet Engineering
      • Jan 2021 - Jan 2022

      Enhancing exchange wallet digital signature infrastructure Hardening existing Ethereum transaction processing to minimize on-chain failures Validating smart contract vulnerability by utilizing formal verification Technologies & tools: Scala , Play, Solidity ,OpenEthereum , Hardhat , Ganache , Manticore , PostgreSQL , Slick Enhancing exchange wallet digital signature infrastructure Hardening existing Ethereum transaction processing to minimize on-chain failures Validating smart contract vulnerability by utilizing formal verification Technologies & tools: Scala , Play, Solidity ,OpenEthereum , Hardhat , Ganache , Manticore , PostgreSQL , Slick

    • United States
    • IT Services and IT Consulting
    • 1 - 100 Employee
    • DLT Software Architect/Blockchain Lead at OpenCrowd
      • Dec 2017 - Nov 2020

      Integrated EVM to enable smart contracts on non blockchain DLT. Leading Hedera Hashgraph Services implementation team. Coordinate design, development, testing and deployment of various aspects of the Hedera Hashgraph Services. Java , Solidity , EVM Integrated EVM to enable smart contracts on non blockchain DLT. Leading Hedera Hashgraph Services implementation team. Coordinate design, development, testing and deployment of various aspects of the Hedera Hashgraph Services. Java , Solidity , EVM

    • United Kingdom
    • Financial Services
    • 700 & Above Employee
    • Global Payments Software Engineer Project Lead
      • Apr 2013 - Oct 2017

      Designed and developed various parts of multi-tenant SaaS version of GPP SP Payment platform by enhancing implementation of Fedwire, Fed Securities, SWIFT and NACHA modules. Enhanced reporting and customer advising modules by integrating with OBIEE . Designed and developed a new version of internal token based OFAC compliance search module using Oracle database and IBM eXtreme Scale /Oracle Coherence in-memory data grid. Prototyped proof of concept Student lending market place over Ethereum – blockchain-based decentralized network . Technologies & tools: Java EE , Spring , Oracle database, WebLogic , OBIEE , IBM MQ, MongoDB , Angular,Web Services(REST ,SOAP), JUnit ,Maven,Jenkins ,EthereumJ Show less

    • Financial Services
    • 200 - 300 Employee
    • Software Engineer Project Leader
      • Dec 2001 - Apr 2013

      Developed and supported PayPlus USA payment system, which enabled financial institutions to electronically process all principal payments types, transfer funds and manage cash positions. Payment types included FED, SWIFT, Book Transfers, FedWire Securities transfers.Designed and developed SQL based OFAC compliance search module that used SDN and other watch list data provided by Accuity.Developed code to Integrated hard token Vasco authentication devices into PayPLUS USA .Converted legacy fax advising/initiation submodule to utilize more robust RightFax server.Used COM+ technology to develop components of distributed multi-tier Payments applicationthat delivers a variety of services, including sophisticated GUI components, mid-tier business objectsand background objectsProvided on phone and on site 3rd level support support for multiple financial institutions.Development tools : Visual C++ , Visual Basic , SQL Server , Java , SSIS , Crystal Reports Show less

    • Senior Software Engineer
      • Dec 1998 - Dec 2001

      Designed, developed, and deployed user facing Client/Server system Nostro Plus that facilitated management of correspondent bank accounts. The system was used by multiple international financial institutions for near-time processing of nostro accounts and intra-day liquidity management . Created automated reconciliation engine, which performed transaction-matching process through specified customized rules.Helped sales team by conducting system presentation to customers and by answering technical RFP questions. Development Tools: VB/VC++,XML, SQL Server, Crystal Reports , Oracle Show less

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