Денис

DENYS LANDAR
Technical Support Specialist | Customer Support | Mobile & Network Troubleshooting
Email: [open contact info](look above in the "contact info" section) | Tel: [open contact info](look above in the "contact info" section) | Telegram: @DNS_LNDR
LinkedIn: [open contact info](look above in the "contact info" section) | Languages: Ukrainian (Native), Russian (Fluent), English (B2)

PROFILE
Technical specialist with 4+ years of hands-on experience diagnosing and resolving complex mobile-device and network issues
for international customers. Skilled at reproducing problems, isolating root causes through log analysis, documenting them
clearly in English, and escalating critical cases through Jira. From 2023 to 2026, served as the main technical point of contact
between testing teams in 10 countries and customer/development teams, while mentoring new colleagues. Before moving into
IT, spent eight years in a construction crew that built about 30 houses, working directly with clients and delivering to deadlines.
Calm under pressure, patient with non-technical users, and strong at conflict resolution.

PROFESSIONAL EXPERIENCE
Manual QA Engineer, Mobile Devices (Freelance Contract) | HydSoft Jul 2026 - Present
• Perform manual testing of mobile devices: core functionality, app compatibility and modem/network behavior (2G-5G,
VoLTE/VoWiFi, calls, SMS/MMS, mobile data).
• Capture and analyze device logs with ADB, Qualcomm (QXDM, QCAT) and MTK ELT tools to pinpoint root causes of failures.
• Reproduce issues, write clear bug reports in English and follow them through to resolution with the customer's teams.
Team Leader, STOTU Department | Thundersoft Ukraine Jun 2023 - Jul 2026
• Customer & stakeholder communication: served as primary technical liaison between testing teams and the customer's
development teams; explained technical issues clearly in English and drove critical cases to resolution.
• Troubleshooting & root-cause analysis: diagnosed device and network problems (calls, SMS/MMS, VoLTE/VoWiFi, mobile
data, handover, 5G/NR, SRVCC, CSFB) using ADB, Qualcomm QXDM/QPST/QPCAT, QCAT and MTK ELT logs.
• Ticket management: registered, prioritized and tracked issues in Jira and PDM; wrote bug reports and daily status reports.
• Global support coverage: supported testing teams across EEA, Gulf and Asia-Pacific regions, including in-country coverage
for the Czech Republic, Romania, Bosnia and Herzegovina, France, Sweden, Finland, Greece, Saudi Arabia, Australia and
South Korea.
• Team leadership: mentored and onboarded new team members; coordinated project setup across markets.
Freelance Construction & Renovation Work | Private projects, Ukraine Aug 2022 - Jun 2023
• Short-term private construction and renovation jobs between IT roles.
Field Test Engineer | Thundersoft Ukraine Aug 2021 - Aug 2022
• Installed and upgraded mobile software on devices from multiple vendors and chipsets (Qualcomm, MediaTek, UniSoc).
• Troubleshot devices on-site in multiple countries: collected and analyzed logs (QXDM, QCAT, ELT, ADB), reproduced and
tracked issues, wrote test plans and bug lists.
Construction & Renovation Specialist (Self-employed) | Private projects, Ukraine 2013 - 2021
• Direct client work: communicated with homeowners to clarify needs, agree on scope and keep them updated; explained
technical solutions in plain language.
• Delivery at scale: as part of a ~10-person crew, built about 30 private houses from scratch, plus a shooting range and a
hangar for a military-tech company, alongside many smaller roofing, facade and renovation orders.
• Problem solving and reliability: diagnosed and fixed issues on site, often with little guidance and tight timelines; took
responsibility for quality and delivered on schedule.
• Self-development: Software Engineering degree (2013); in 2021 completed a QA course and retrained into IT.

CORE COMPETENCIES
• Technical support: troubleshooting, root-cause analysis, issue reproduction, escalation, incident documentation
• Customer communication: clear English communication, explaining technical topics simply, conflict resolution
• Ticketing & documentation: Jira, PDM, bug reports, daily reports, test plans and test cases
• Mobile & networks: 2G/3G/4G/5G (NR), VoLTE/ViLTE/VoWiFi/ViWiFi, IMS/SIP, SRVCC, CSFB, Android OS
• Tools: ADB, Qualcomm QXDM5/QCAT/QPCAT/QPST, MTK ELT, SQL basics, UNIX, API/web service testing
• Soft skills: multitasking, attention to detail, fast learner, self-motivated, ownership and responsibility

EDUCATION & CERTIFICATIONS
Bachelor's Degree in Software Engineering 2009 - 2013
Kyiv State Maritime Academy after Hetman Petro Konashevich-Sahaydachniy
QA BASE Course - QA Start-Up Mar 2021 - Jul 2021
Software Testing, SQL, HTML/CSS, UNIX, Web Service Testing, API
• LinkedIn Learning: Software Testing Foundations - Bug Writing and Management; Test Automation with Python 3