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Mobile Core Solution Design Engineer– Tieto Tech Consulting (m/f/d)

Tietoevry1

Sofia, MASOVIAN VOIVODESHIP, Bulgaria permanent

Posted: January 19, 2026

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Quick Summary

Mentormate, part of Tieto Tech Consulting, is inviting a talented professional to join our growing team as a Mobile Core Solution Design Engineer to support our respectful customer's BICS Sim for Things value stream, with a focus on leading and contributing to the analysis, design, development and implementation of network solutions based on business, technical, operational and regulatory requirements.

Job Description

Mentormate, part of Tieto Tech Consulting, is inviting a talented professional to join our growing team as a Mobile Core Solution Design Engineer to support our respectful customer's BICS Sim for Things value stream, with a focus on leading and contributing to the analysis, design, development and implementation of network solutions based on business, technical, operational and regulatory requirements.

 

Areas of Responsibility

• Review technical solutions to confirm they meet business, regulatory, operational, cost, time-to-market, and quality requirements
• Lead technical platform development, shape the roadmap, maximise technology use, and apply call-flow analysis and troubleshooting expertise
• Contribute to end-to-end implementation projects of small to medium scale by coordinating with stakeholders and supporting the design, rollout, and maintenance of technical platforms and operational systems
• Draft and review both functional and technical specifications, as well as Requests for Proposal (RFP) documents
• Develop methods, procedures, and technical documentation for use by various stakeholders such as marketing, product management, and operational teams
• Engage in the implementation of technical solutions in close collaboration with our operational teams
• Provide outstanding support to both internal and external stakeholders in the technical domain, building credibility and trust while serving as a respected authority within the area of expertise

 

Qualifications

• Engineering degree in telecommunications and/or IT technology
• Good knowledge of networks, telecommunications, and the IT landscape
• 6+ years of professional experience in a telecom or IT environment
• Strong technical knowledge in the following: HTTP, SS7, Diameter, MAP, INAP, GTP
• Experience with SIM Applets, Over-The-Air (OTA), eSIM, eUICC, SMDP/SMSR, SMDP+
• A comprehensive view of the mobile core and understanding of call flows is considered an asset
• Proven experience in designing and deploying comprehensive mobile core network solutions, including 4G LTE and 5G core networks, across traditional and cloud-based environments such as AWS, Azure, or Google Cloud 

 

Will be an advantage

• Hands-on knowledge of two or more mobile core components in 2G, 3G, LTE (e.g. P-GW/GGSN, HSS/HLR, PCRF)
• Experience in roaming, IoT/M2M, and a background in an MVNO/MVNE environment
• Knowledge of the international carrier business is an asset

 

At Tieto, we believe in the power of diversity, equity, and inclusion. We encourage applicants of all backgrounds, genders (m/f/d), and walks of life to join our team, as we believe that this fosters an inspiring workplace and fuels innovation. Our commitment to openness, trust, and diversity is at the heart of our mission to create digital futures that benefit businesses, societies, and humanity.

Diversity, equity and inclusion (tietoevry.com)

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