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Denis Glazachev, Algorithms Developer in Yerevan, Armenia
Denis Glazachev

Algorithms Developer in Yerevan, Armenia

Member since April 3, 2017
Denis is primarily a C++ programmer on high-load oriented, low latency, and distributed systems. However, he is also familiar and interested in various operating systems and different programming languages and environments. Denis communicates extremely well and also has a strong computer networking background.
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Portfolio

Experience

  • Algorithms 10 years
  • Object-oriented Programming (OOP) 10 years
  • TCP/IP 7 years
  • Concurrent Programming 6 years
  • CMake 6 years
  • C++17 3 years
  • Boost.Asio 3 years
  • Asynchronous Programming 2 years

Location

Yerevan, Armenia

Availability

Part-time

Preferred Environment

Git, Visual Studio, Xcode, Windows, Linux, MacOS, Bazel, CMake, C++

The most amazing...

...thing I've implemented is a market data feed collector fault tolerance module, that performs complex gap patching, and data arbitration for latency reduction.

Employment

  • Senior Software Engineer

    2019 - PRESENT
    Altinity
    • Maintained the open-source C++ code base of the official ODBC driver implementation for accessing ClickHouse as a data source: https://github.com/ClickHouse/clickhouse-odbc.
    • Rolled out ten releases of ClickHouse ODBC driver with numerous bug fixes and new features.
    • Implemented Kerberos and LDAP authentication support in ClickHouse DBMS.
    • Implemented various features and fixed bugs in ClickHouse DBMS.
    Technologies: C++, C++17, C++20, SQL, ODBC, Kerberos, LDAP, HTTP, ClickHouse

  • Senior Software Engineer

    2017 - 2019
    Trinity Mobile Networks
    • Built a C++ software IP gateway for in-house L3 multihoming, on top of a packet processing core, as a part of a large-scale platform.
    • Implemented client connection and session management in the IP gateway, with management planes involving AMQP and HTTP (REST), capable of handling over 1000 simultaneous sessions on a single processing core.
    • Implemented stateless IPv4-IPv6 traffic conversion and forwarding.
    • Implemented Boost.Asio wrappers for: Linux TUN/TAP interfaces, third-party C++ RabbitMQ client library, libpcap capture interfaces, message-based encryption sessions using DTLS implementation from OpenSSL.
    • Maintained CI/CD build automation scripts of the IP gateway.
    Technologies: UDP, TCP, IPv6, IPv4, Datagram Transport Layer Security (DTLS), Transport Layer Security (TLS), OpenSSL, libpcap, Tcpdump, Linux, Point-to-Point Tunneling Protocol (PPTP), Unix, Sockets, REST, HTTP, JSON, RabbitMQ, AMQP, Boost.Asio, Boost, C, C++14, C++11, Asynchronous I/O, Software-defined Networking (SDN)

  • Senior Software Engineer

    2016 - 2017
    Blockchain R&D Hub Armenia
    • Designed the structure and developed code for the core as well as ongoing projects of DECENT blockchain content distribution platform.
    • Implemented modules that employ torrent and IPFS for massive decentralized content sharing back end.
    • Integrated third-party libraries into the build process, and made them available for use by the core code of DECENT.
    • Configured and maintained a continuous integration environment for the project.
    Technologies: Linux, MacOS, Xcode, Clang, GCC, Valgrind, Multithreading, Object-oriented Design (OOD), Object-oriented Programming (OOP), Shell Scripting, CMake, Boost, Standard Template Library (STL), C++11

  • Senior Software Engineer

    2010 - 2016
    OneMarketData
    • Designed and implemented fault tolerance algorithm and module for smart patching of more than two inbound potentially incomplete or corrupted market data streams with peaks of 1M+ ticks per second.
    • Implemented ODBCv3 driver for OneTick time-series solution.
    • Mentored and managed junior engineers and team members.
    • Implemented feed handler back-end layer of the automatic trading module.
    • Designed, implemented, and applied techniques and tools for preserving execution states of huge long-running processes for later resumption.
    • Implemented feed parsers and collectors for a number of market data vendors using their APIs.
    • Applied parallelization on stream processing routines using lockless algorithms and data structures.
    • Ported code to various Unix platforms and compilers, including macOS, Linux, Solaris, latest versions of GCC compiler, SPARC, POWER, and x86 architectures.
    • Prepared third-party libraries and tools for integration and use with OneTick, including non-trivial portable GCC setups, Boost, and more.
    Technologies: Sockets, Data Structures, Algorithms, Scripting, Makefile, Metaprogramming, Oracle Solaris, Valgrind, GCC, Regular Expressions, Multithreading, Object-oriented Design (OOD), Object-oriented Programming (OOP), Shell Scripting, ODBC, Perl, Boost, Standard Template Library (STL), C++, C

  • Junior Researcher

    2010 - 2011
    Computer Modeling Lab, Institute of Molecular Biology of Armenia
    • Maintained a Beowulf-style Linux computer cluster.
    • Managed access to computational resources for a team of research scientists.
    • Set and ran molecular dynamics simulations on the cluster and local Grid computing facilities.
    • Managed access to computational resources for a team of research scientists.
    • Co-authored a research paper: https://link.springer.com/article/10.1134/S0026893312020185.
    Technologies: Grid Computing, Linux, MPI

  • Network Architect

    2006 - 2008
    FiberNet Communications
    • Designed, implemented, and maintained the end-to-end architecture and the topology of the carrier network.
    • Configured and maintained the inter-domain and core network routing infrastructure using BGP, MPLS, and OSPF.
    • Designed the technical rules of connections between the carrier network and 10+ last-mile ISPs and 30+ individual clients, and maintained those connections.
    Technologies: Quality of Service, Open Shortest Path First (OSPF), IP Routing, BGP, Multiprotocol Label Switching (MPLS), IS-IS

Experience

  • Non-intrusive C++ Serialization Library

    As a part of my work on a commercial project, I designed and implemented a heavily template-based serialization library that allows users to save and restore the states of complex objects and programs in general. The versatility of the library allows a user to achieve this with minimal changes in the existing code.

  • Software IP gateway

    As a part of my work on a commercial project, I designed and implemented a C++ software IP gateway for in-house L3 multihoming.

  • Specialized C++ Allocators

    As a part of my work on a commercial project, I designed and implemented a range of specialized allocators for use in different latency-sensitive parts of the data flow as well as in scenarios where the states of the running processes must be preserved for later restoration.

  • ODBCv3 Driver

    As a part of my work on a commercial project, I designed the back-end of an ODBCv3 driver and implemented it for a proprietary database.

Skills

  • Languages

    C, C++11, C++, C++14, C++17, Perl, SQL, TypeScript, JavaScript

  • Other

    Boost.Asio, Software Architecture, Clang, HTTP, IPv4, Algorithms, Lock-Free Programming, Multithreading, Regular Expressions, TCP/IP, Data Structures, Architecture, Shell Scripting, Cisco, IP Routing, Open Shortest Path First (OSPF), Quality of Service, Grid Computing, Oracle Solaris, Scripting, Asynchronous I/O, Point-to-Point Tunneling Protocol (PPTP), Transport Layer Security (TLS), Datagram Transport Layer Security (DTLS), IPv6, TCP, UDP, BGP, GRID, Unix Shell Scripting, Multiprotocol Label Switching (MPLS), IS-IS, C++20, Kerberos, LDAP

  • Frameworks

    Boost

  • Libraries/APIs

    ODBC, Standard Template Library (STL), MPI, Sockets, AMQP, libpcap, OpenSSL, Node.js

  • Tools

    Xcode, Valgrind, Makefile, CMake, GCC, Visual Studio, Git, RabbitMQ, Tcpdump, Bazel

  • Paradigms

    Design Patterns, Socket Programming, Concurrent Programming, Object-oriented Programming (OOP), Object-oriented Design (OOD), Metaprogramming, Template Metaprogramming, Asynchronous Programming, REST, Testing, Unit Testing, Functional Programming, Software-defined Networking (SDN)

  • Platforms

    MacOS, Unix, Linux, Windows, Solaris

  • Storage

    JSON, ClickHouse

Education

  • Specialist Degree in Applied Mathematics and Computer Science
    2003 - 2008
    Russian-Armenian State University - Yerevan, Armenia

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