Lead QA Engineer with VoIP/SIP stack

IDT Corporation; Warszawa; Hybrid; PLN 180,000 - 260,000; Full time

Benefits offered by this job

Remote/hybrid work opportunities

Long-term growth

Annual performance review

Quality hardware

Career development

Training/conference sponsorship

Referral program

English language classes

Job summary

IDT Corporation is seeking an experienced Lead QA Engineer to lead manual and integration testing for the Net2Phone UCaaS platform, focusing on REST/gRPC APIs and SIP validation. You will collaborate with Product Owners, define acceptance criteria, and shape release guidelines while contributing to performance testing and automation efforts where feasible.

The role emphasizes manual test execution, cross-team coordination, and end-to-end release orchestration, offering opportunities for growth

Qualifications

• 6+ Years in QA Engineering: Backend and API/Microservices testing (REST, JSON, gRPC).
• 2+ Years in VoIP / SIP Protocol Testing: Call flow verification, media, WebRTC, or telecom load tools.
• SIP Tracing & System Diagnostics: Linux CLI and SIP tracing instruments (Hepic, CP Tools, tcpdump).
• English Proficiency: Upper-Intermediate (B2) or higher (written and spoken).
• Load & Performance Testing: Hands-on experience with load and performance testing tools (JMeter, Gatling, SIPp).
• Build & Release Testing: Validating, testing, and promoting software builds through release cycles.
• Programming & Automation Background: Java (11/17) and testing frameworks (JUnit5, TestNG, Gradle).

Responsibilities

• Requirements Analysis & PO Collaboration: Partner with Product Owners to build robust requirement lists, refine acceptance criteria, and execute early-stage requirements testing before development begins.
• Release Governance & Guidelines: Design, document, and standardize end-to-end release processes, quality gates, and deployment guidelines for the engineering team.
• Lead Manual & Integration Testing: Plan and execute rigorous manual test cycles across microservices and REST/gRPC APIs to validate complex integration scenarios.
• Manage Release Operations: Orchestrate deployment tasks, build triggers, and post-deployment verifications in Jenkins across testing and staging environments.
• Test Case Architecture: Write, organize, and maintain detailed, step-by-step manual test cases and execution runs in Allure TestOps.
• VoIP & SIP Validation: Conduct functional testing on real-call scenarios, media flows, and SIP protocol behavior under active network conditions.
• Agile Quality Gateway: Participate actively in SCRUM ceremonies, manage defect lifecycles in Jira, and serve as the final quality sign-off for release candidates.

Skills

QA Engineering

VoIP Testing

SIP Protocol Testing

English Proficiency

Tools

Hepic

CP Tools

tcpdump

Jenkins

Allure TestOps

Jira

JMeter

Gatling

SIPp

Java 11/17

JUnit5

TestNG

Gradle

Job description

About the Role

We are looking for an experienced Lead QA Engineer with strong VoIP and SIP stack expertise to join our Net2Phone UCaaS platform team. This role focuses primarily on manual testing, microservices/API validation, requirements testing alongside Product Owners, and establishing team-wide release guidelines. While the core day-to-day focus is manual execution and release orchestration, exposure to performance testing tools, build management, or Java test automation is a plus.

What You Will Do

• Requirements Analysis & PO Collaboration: Partner closely with Product Owners to build robust requirement lists, refine acceptance criteria, and execute early-stage requirements testing before development begins.


• Release Governance & Guidelines: Help design, document, and standardize end-to-end release processes, quality gates, and deployment guidelines for the engineering team.


• Lead Manual & Integration Testing: Plan and execute rigorous manual test cycles across microservices and REST/gRPC APIs to validate complex integration scenarios.


• Manage Release Operations: Orchestrate deployment tasks, build triggers, and post-deployment verifications in Jenkins across testing and staging environments.


• Test Case Architecture: Write, organize, and maintain detailed, step-by-step manual test cases and execution runs in Allure TestOps.


• VoIP & SIP Validation: Conduct functional testing on real-call scenarios, media flows, and SIP protocol behavior under active network conditions.


• Agile Quality Gateway: Participate actively in SCRUM ceremonies, manage defect lifecycles in Jira, and serve as the final quality sign-off for release candidates.

What we expect

Must-Have

• 6+ Years in QA Engineering: Deep focus on Backend and API/Microservices testing (REST, JSON, gRPC).


• 2+ Years in VoIP / SIP Protocol Testing: Call flow verification, media stream validation, WebRTC, or telecom load tools.


• SIP Tracing & System Diagnostics: Strong command of Linux CLI and SIP tracing instruments (e.g., Hepic, CP Tools, tcpdump).


• English Proficiency: Upper-Intermediate (B2) or higher (written and spoken).

Nice to Have

• Load & Performance Testing: Hands-on experience with load and performance testing tools (JMeter, Gatling, SIPp).


• Build & Release Testing: Direct experience validating, testing, and promoting software builds through release cycles.


• Programming & Automation Background: Experience or familiarity with Java (11/17) and testing frameworks (JUnit5, TestNG, Gradle) to read code, assist with debugging, or contribute to automation efforts.

Tech Stack & Tooling

• Domain & Protocols: VoIP, SIP stack, WebRTC, REST APIs, gRPC, Microservices


• SIP Tracing & Diagnostics: Hepic, CP Tools, tcpdump, Linux CLI


• CI/CD & Deployments: Jenkins


• Test & Defect Management: Allure TestOps, Jira


• Performance & Load (Bonus): JMeter, Gatling, SIPp


• Languages & Frameworks (Bonus): Java 11/17, JUnit5, TestNG, Gradle


• Methodology & Process: Agile / SCRUM, Requirements Testing, Release Governance

We offer you

• Remote b2b or hybrid (Belarus-Moldova) work opportunity!


• Stable job with long-term growth perspective.


• Competitive salary with annual performance review.


• Really good hardware.


• An exciting and challenging job with talented people around.


• Continuous learning and career growth opportunities.


• Compensation for professional training, seminars, and conferences.


• Referral program - get rewarded for helping us grow the team with talented people.


• Company-supported English classes to enhance your professional growth.


• More perks for the Minsk and Chisinau office employees.

A few words about us

IDT Corporation is a global communications company founded in 1990 and headquartered in Newark, New Jersey. We are industry leaders in prepaid communication and payment services and one of the largest international voice carriers. We are listed on the NYSE, employ over 1800 people across 20 countries, and have over $1.5 billion in revenues.

We are not "another big IT corporation" - we encourage and support in-house entrepreneurs in developing their ideas into business actions.

Net2Phone is a rapidly growing global provider of unified cloud communications solutions. It was named 'VoIP Supplier of the Year' by the Telecom Consulting Group in 2018. Its cloud communication solution provides an integrated communications suite featuring powerful