> Markdown version of [/jobs/ext/3520453-applications-test-engineer](https://www.wearedevelopers.com/jobs/ext/3520453-applications-test-engineer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Applications Test Engineer

- **Company:** Applcations Test Engineerto
- **Location:** Belper, UK
- **Experience:** Expert
- **Contract:** Temporary contract
- **Skills:** .NET Framework, Software Applications, Application Testing, Systems Engineering, Automation of Tests, Computer Networks, Dynamic Host Configuration Protocol, Domain Name System (DNS), Design of User Interfaces, Networking Hardware, Virtual Private Networks (VPN), Network Security, Routing, Requirements Traceability, Simple Network Management Protocols, Software Requirements Analysis, TCP/IP, Wireshark, Virtual Local Area Networks, Windows Desktop, Scripting, Computer Network Technologies, Test Scripts, SC Clearance, Integration Tests
- **Published:** October 1, 2026
- **Apply:** https://www.apply4u.co.uk/jobs/applications-test-engineer/49641367

## About the Role

Salary: Competitive Salary| Derby - Onsite | Contract - 6 months initially | Flexible Working Security Clearance: Minimum SC clearance required and have it cleared already; DV highly desirable We're recruiting for a Applcations Test Engineerto join a growing and ambitious team at a pivotal stage in its journey. Want to be part of a business that is disrupting the national security market? Our client is a fast-growing UK sovereign technology company delivering innovative encryption and secure communications solutions to some of the country's most demanding customers. Combining deep technical expertise with an agile, customer-focused approach, they are challenging the status quo and proving that world-class capability can come from a dynamic and ambitious SME. What We're Looking For: 5+ years' commercial experience in software or applications testing. Strong experience testing Windows desktop applications, ideally within a .NET environment. A solid understanding of functional,
system, regression and integration testing. Experience writing and executing structured test cases and test procedures. Strong skills in defect investigation, troubleshooting and root cause analysis. Experience testing UI/UX, user workflows and application functionality. Good networking knowledge across TCP/IP, routing, switching, VLANs, DHCP, DNS and VPNs. Practical understanding of SNMP and network device management. Experience using Wireshark or similar packet-analysis tools. Strong written and verbal communication skills, with the ability to produce clear technical documentation and test reports. A methodical, analytical approach and excellent attention to detail. The ability to work independently while collaborating effectively with software developers and engineering teams. Key Responsibilities: Create, review and maintain test plans, test procedures and test cases for Windows desktop applications. Plan and execute functional, system, regression and integration testing. Test
applications used to configure, monitor and manage secure networking devices. Validate software requirements and ensure requirements traceability throughout the development lifecycle. Assess UI, UX and end-to-end user workflows to ensure applications are intuitive, reliable and fit for purpose. Identify, reproduce, investigate and document software defects and technical issues. Perform troubleshooting and root cause analysis, working closely with developers and engineers to resolve issues. Validate communications between software applications and network-connected hardware. Test SNMP functionality and network device management features. Analyse network traffic and communications using Wireshark and similar tools. Record test results, observations and defects accurately and maintain clear technical documentation. Support software releases, acceptance testing and customer-facing validation activities. Contribute to improving testing processes, methodologies and quality standards. Support the
development of automated testing and contribute scripting or automation ideas where appropriate. Work collaboratively with software developers, systems engineers and product stakeholders to ensure high-quality software delivery. What's on offer: 25 days annual leave Company pension 4x Death in service EV car scheme Benefit platform with high street discounts #J-18808-Ljbffr