Interim Test Engineer

Project overview

Work you can be proud of Utility Connect provides wireless telecommunications for grid operators via its own telecom network. In addition to the existing network, Utility Connect is developing and building a new telecom network based on LTE-M technology. This network must meet high standards for security, reliability, and availability, ensuring that services for parties with vital infrastructure can be provided reliably and securely, and remain available even in emergencies. Utility Connect was founded in 2014 as a joint subsidiary of Stedin and Alliander.

Together, we are working on the energy system of the future. To this end, we are expanding the grids, making the system smarter, and developing solutions to optimally design and utilize the energy system. For the realization of a business-critical LTE-M network, we are looking for a Test Engineer focused on ensuring the performance, availability, stability, and security of the telecom and network infrastructure. In this role, you will be responsible for test readiness, execution of test activities, and release support for the Core Network and underlying services.

You will actively contribute to the quality of the end-to-end service by performing test activities, coordinating defects, validating integrations, and monitoring test and release readiness. You will work within a multidisciplinary program where telecom networks, IT systems, SIM/eSIM platforms, devices, provisioning, monitoring, security, and operational processes together form one end-to-end service. What you will do

• analyze requirements, architecture, interfaces, and technical designs;
• prepare and maintain test scenarios, test cases, and test data;
• automate suitable API and system tests;
• perform System Integration Testing (SIT) including interfaces, processes, and non-functional tests;
• support FAT, SIT, UAT, and end-to-end testing;
• support performance and load testing;
• register, analyze, and follow up on defects;
• perform regression testing;
• collect test evidence for quality gates and acceptance; What you bring to the table
• minimum of 5 years of experience as a Test Engineer, Technical Tester, Integration Tester, or similar role;
• experience with FAT, SIT, UAT, and end-to-end testing in mobile telecom networks, preferably Nokia;
• knowledge of mobile network architecture (RAN & Core) and the role of components such as eNB, HSS, MME, SGW/PGE, SMSC, AAA;
• in-depth knowledge of IP networks, IP protocols such as BGP and TCP/IP;
• insight into interfaces and signaling flows (e.g., S1, S6A, Gx, Diameter, NAS signaling, GTP, radius);
• good knowledge of API testing (REST, JSON, XML, and preferably SOAP);
• experience with OSS/BSS landscapes, workflow, orchestration, and integration platforms within telecom environments;
• experience with service provisioning, inventory management, and service assurance;
• experience with log, trace, and protocol analysis;
• experience with requirements-based and risk-based testing;
• experience with performance, resilience, security, and failover testing;
• experience with network troubleshooting and defect management;
• good command of Dutch and English; Competencies Strong analytical skills, pragmatic, results-oriented, environmentally aware, communicative, independent, flexible, collaborative, decisive, and strong in stakeholder management. Excellent command of English. Dutch is a plus. Conditions
• We are accustomed to working hybrid, and for this role, you must be available at least 4 days per week.
• You will work at our office in Vianen for at least 50% of your time.
• Project duration is 6 months with the possibility of extension.
• Required: VOG (Certificate of Conduct), professional liability insurance, business liability insurance.

Project details

• Start: 2026-10-28T23:00:00
• Location: Vianen Utrecht, NL
• Languages: Dutch