# Roman Semenov

> Principal Software Engineer at F5 Networks

Location: Milpitas, California, United States
Profile: https://flows.cv/romansemenov

## Work Experience
### Principal Software Engineer @ F5 Networks
Jan 2022 – Present | San Jose, California, United States
Department: Nginx+, PD
Position: Principal Software Engineer
Responsibilities: new features development, legacy code maintenance. 

    • SME in MQTT, Keyval, Active Health Checks, JWT Auth.
    • Significantly reduced traffic overhead by implementing JWT key caching. (С)
    • Implemented keepalive mode for Active Health Checks, contributing to system robustness (C).
    • Pioneered the integration of Nginx+ into the growing IoT market through the implementation of new MQTT stream preread and filter modules (C).
    • Leading a development team in the creation of a new module.
    • Actively participated in technical and design discussions.

### Principal Software Engineer @ F5 Networks
Jan 2013 – Jan 2022 | San Jose, California, United States
Department: Access Policy Management module (APM), PD
Position: Principal Software Engineer
Responsibilities: new features development, legacy code maintenance. 

    • SME in LDAP, MSRPC, NTLM, Active Directory, Kerberos, RADIUS, RSA SecurID, SSO.
    • Drove new features development and maintained legacy code, specializing in LDAP, MSRPC, NTLM, Active Directory, Kerberos, RADIUS, RSA SecurID, and SSO.
    • Redesigned and re-implemented the LDAP module, resulting in a performance boost of over 20% (C++).
    • Key contributor to the MFA team, implementing agents for adding and verifying client devices (C++).
    • Designed and implemented OAuth client authentication module (C++).
    • Expanded the proprietary ASN.1 library with DER encoding (C).
    • Developed libmsrpc, eliminating SAMBA dependency on BigIP and resolving security issues in SMB protocols (C++).
    • Ported NAP module of Nginx+ to multiple OS, creating corresponding pipelines in gitlab (C/C++, YAML).
    • Established development infrastructure for APM team to work in gitlab (YAML).
    • Handled numerous customer cases and internally reported bugs (C/C++, XML, PHP).

### Software Engineer @ F5 RO Inc
Jan 2005 – Jan 2013 | Tomsk, Russia
Department: Access Policy Management module (APM), PD
Position: Software Engineer III
Responsibilities: new features development, legacy code maintenance. 

Most memorable projects are:
    • designed and implemented AD/LDAP group caches
    • designed and implemented support for nested groups by AD/LDAP modules
    • support for paged results returned by AD/LDAP server
    • support for UPN suffix for AD – users across a forest can log in seamlessly
    • AD Auth performance improvement by including PADATA in very first AS-REQ
    • implemented clientKey encryption mechanism for APM module of BigIP
    • designed and implemented session variable modifiers for APM module

### System Administrator @ UGRASU
Jan 2004 – Jan 2005
deployed and maintained few LAN segments based on Windows Server 2K+ and Linux (RedHat/Debian families)

### System Administrator @ Consultant Ltd
Jan 2003 – Jan 2004
maintained ISP internet access service based on several linux (RedHat) servers (gateway, billing system, local web services, customer web services)

developed web-application (Perl) to manage and control BroadBand Wireless Access equipment (BreezeAccess) via SNMP. The system includes daemon process (linux C) to update stats from endpoint devices.


## Education
### Master of Science (M.S.) in Automated Control Systems
Tomsk State University of Control Systems and Radioelectronics


## Contact & Social
- LinkedIn: https://linkedin.com/in/roman-semenov-

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Source: https://flows.cv/romansemenov
JSON Resume: https://flows.cv/romansemenov/resume.json
Last updated: 2026-04-12