Core Network Architect - Advisor (Contract) | Senior | Saily

Nord Security

1d•Remote

About The Position

Saily is seeking an experienced Core Network Architecture Advisor to guide the technical development of its telecommunications infrastructure. This is an advisory role that may also involve hands-on work. The advisor will work closely with engineering leadership and the core network team to review architectural decisions, challenge assumptions, identify risks, and support informed technical choices. The role covers mobile core networks, including packet core, roaming, signaling, integrations, and related telecommunications systems.

Requirements

Strong professional background in mobile core network architecture and engineering.
Hands-on experience designing, deploying, and operating mobile core networks in production environments.
Solid understanding of mobile packet core technologies, including 4G/LTE EPC and 5G Core, their components, and how they interact.
Practical knowledge of mobile network integrations, signaling, roaming, and connectivity infrastructure.
Ability to evaluate architectural approaches, explain trade-offs, and provide pragmatic recommendations.
Comfort working with engineering teams in a consultative capacity rather than a management role.

Nice To Haves

Experience with MVNO, MVNE, or international roaming architectures.
Knowledge of IMS, VoLTE, VoNR, or other voice and messaging technologies.
Familiarity with eSIM technologies and remote SIM provisioning.
Experience with cloud-native telecommunications infrastructure, virtualization, or Kubernetes.

Responsibilities

Review and advise on mobile core network architecture, including packet core, roaming, signaling, and related telecommunications systems.
Help engineers address complex telecommunications challenges, troubleshoot architectural problems, and evaluate potential solutions.
Advise on build-versus-buy decisions, open-source and commercial solutions, infrastructure choices, and architectural trade-offs.
Provide technical expertise for vendor evaluation, mobile network operator integrations, and interoperability design.
Identify architectural weaknesses, scalability limitations, reliability concerns, and potential integration challenges.
Share knowledge of telecommunications standards, established industry practices, and emerging technologies.
Serve as a technical sounding board and translate complex telecommunications concepts into practical recommendations.

Benefits

Training, mentorship, and opportunities to grow.
Extra vacation days, sick days, and time off when needed.
Fully covered private health insurance in Lithuania and Poland.
Free Calm, Headspace, and Mindletic subscriptions, plus resilience and mindfulness trainings.
In-house gyms, sport cards, online workouts, and personal guidance.
Company-wide workation trip abroad.
Ability to work from anywhere.
Gifts for birthdays, weddings, and new family members.
Children’s summer camps and schedule flexibility for parents.
Team-building activities and company events.
Access to Vilnius headquarters amenities, including a coffee bar, open gyms, kids’ room, music room, and massage chairs.