Mission freelance Manual Test Engineer EUC and Zscalar Testing

The Role
The Manual Test Engineer will be responsible for validating end user applications, network components, and security layers-including EUC environments, Zscaler configurations, and enterprise network connectivity. The role involves performing functional, non-functional, regression, and integration testing across digital workplace and network/security infrastructure. The ideal candidate will have strong analytical skills, hands-on testing experience, and a solid understanding of enterprise IT ecosystems.


Your responsibilities:
EUC (End User Computing) Testing
* Perform manual testing of EUC components such as laptops/desktops, VDI, thin clients, Citrix environments, and mobile devices.
* Validate application packaging, distribution, compatibility, and performance in EUC environments.
* Test Windows OS upgrades/patches, M365 applications, collaboration tools, and standard enterprise software.
* Conduct UAT for business-critical EUC applications and ensure seamless end user experience.
* Document test cases, results, and defects in appropriate test management tools.
⭐ Zscaler Testing (Security & Network Access)
* Execute testing related to Zscaler Internet Access (ZIA) and Zscaler Private Access (ZPA).
* Validate secure web gateway policies, access rules, URL filtering, SSL inspection behavior, and tenant-specific configurations.
* Perform authentication and SSO testing (Azure AD, SAML, certificates, etc.).
* Validate Zscaler client connector behavior across different networks (office, home, VPN, mobile hotspot).
* Collaborate with network/security teams to analyze logs, troubleshoot failures, and ensure policy compliance.
⭐ Network Testing
* Conduct manual testing of network changes, routing rules, firewall policies, DNS/DHCP behavior, and connectivity validations.
* Perform end-to-end connectivity checks for business applications across LAN/WAN, VPN, SD WAN, and cloud networks.
* Validate network resiliency, failover scenarios, and performance impact post change.
* Work with network operations teams to verify packet flow, latency, throughput, and error rates based on test scenarios.
* Document network issues with detailed steps, logs, and impact analysis.
Key Skills & Qualifications
Technical Skills
* Strong manual testing experience (3-7 years preferred).
* Hands-on experience in EUC testing, including Windows/Mac OS, VDI, Citrix, M365.
* Practical understanding of Zscaler components-ZIA, ZPA, Client Connector, policy evaluation.
* Working knowledge of network fundamentals (TCP/IP, DNS, DHCP, VPN, routing).
* Experience with test management tools (JIRA, Azure DevOps, ALM, etc.).
* Ability to analyze logs (Zscaler logs, network logs, Event Viewer, browser dev tools).
* Understanding of Change & Incident Management (ITIL preferred).
Soft Skills
* Excellent problem solving skills and attention to detail.
* Strong communication, documentation, and stakeholder engagement abilities.
* Ability to collaborate with cross-functional teams (network, security, EUC, application teams).
* Self-motivated and able to work independently with minimal supervision


LA International is an award-winning partner of choice for many of the world's most influential companies and government organisations. Holding Enhanced Government Security Accreditation, we are recognised as the European market leader in the delivery of Security Cleared talent to organisations that demand the very highest levels of security, compliance and assurance.

A multiple award-winning organisation, having secured the prestigious Queens Award for Enterprise: International Trade over consecutive years. We are committed to fostering an inclusive, equitable and accessible workplace where everyone feels valued and supported. We welcome applications from all individuals, regardless of background or identity, and we encourage candidates who may not meet every listed requirement to still apply. If you require any adjustments or support during the recruitment process, please let us know and we will work with you to ensure a fair and accessible experience.

Please Note: If a high volume of applications is received, only candidates shortlisted will be contacted.