Roles · Telecom Developer · Principal

What a Principal } should know

43 core skills, 58 in total. Expectations per skill, and what changes at the next level.

This page lists what a Principal } is expected to know and do, skill by skill. Core skills are the ones a manager and peers assess in a review cycle; the rest count only in self-assessment. Main areas: Programming Fundamentals, Backend Development, Database Management.

43core skills
15additional skills
12skill areas
100%at Advanced or Expert
Assess myself as Principal Full role matrix

Core skills for a Principal

Grouped by area. The label on the right is the expected depth: Awareness, Working, Advanced or Expert.

Programming Fundamentals · 7

Defines organizational algorithmic strategy for telecom systems: carrier-grade performance optimization standards, cross-team signaling algorithm governance, real-time processing efficiency frameworks. Makes strategic decisions on telecom infrastructure performance investments.

Defines organizational async strategy for telecom: enterprise carrier-grade async processing standards, cross-team real-time concurrency governance, async maturity model for telecom systems. Makes strategic decisions on async infrastructure for telecom workloads.

Defines organizational code quality strategy for telecom systems: carrier-grade reliability standards, cross-team protocol implementation governance, real-time system quality frameworks. Makes decisions on telecom tooling investments and shapes organization-wide network software development practices.

Defines organizational data structure strategy for telecom systems: carrier-grade data architecture governance, cross-team protocol data standards, network data model frameworks. Makes strategic decisions on telecom data platform investments and real-time data infrastructure.

Defines organizational strategy for design patterns in telecom: evaluates enterprise approaches to telecom architecture patterns, makes technology decisions on protocol implementation and signaling architecture standards, mentors leads on strategic pattern application for multi-standard telecom platforms.

Defines organizational multithreading strategy for telecom: evaluates enterprise approaches to concurrent protocol processing, makes technology decisions on real-time threading architectures for telecom platforms, mentors leads on high-performance concurrent programming for telecom infrastructure.

Defines organizational OOP strategy for telecom systems: carrier-grade protocol stack architecture standards, cross-team signaling module governance, real-time system class design frameworks. Makes strategic decisions on telecom software architecture investments.

Backend Development · 2

Apache Kafka Expert

Defines organizational event streaming strategy for telecom. Evaluates Kafka vs next-generation messaging for carrier-grade workloads. Establishes enterprise event architecture standards for network data processing. Drives adoption of event-driven patterns for telecom network automation and analytics at scale.

Redis Expert

Defines organizational Redis and caching strategy for carrier-grade telecom platforms — evaluates caching technologies for telecom-scale session management, establishes enterprise standards for real-time network data caching, and designs reference architectures for carrier-grade caching infrastructure.

Database Management · 1

PostgreSQL Expert

Defines organizational data strategy for telecom platforms: evaluates PostgreSQL and complementary databases for enterprise telecom data workloads, designs multi-region data architectures for global telecom services, establishes governance for CDR storage and subscriber data management at organizational scale.

API & Integration · 3

Defines organizational gRPC API strategy for carrier-grade telecom platforms — designs platform-level proto governance aligned with 3GPP and IETF standards for network function communication. Establishes enterprise API architecture for telecom service mesh spanning multiple network generations and vendor interoperability.

Defines organizational API strategy for telecom: enterprise carrier-grade API platform standards, cross-team telecom API governance, API infrastructure investment decisions for telecom services. Designs enterprise-grade API architecture for telecom platforms.

Defines enterprise strategy for real-time telecom communication infrastructure. Evaluates WebSocket vs emerging protocols for next-generation telecom services. Establishes organizational standards for carrier-grade real-time communication. Drives adoption of modern API-based telecom architectures leveraging WebSocket for developer-facing services.

Cloud & Infrastructure · 3

Docker Expert

Defines organizational container strategy for telecom: enterprise carrier-grade container platform standards, cross-team telecom service governance, real-time communications container frameworks. Designs enterprise-grade container infrastructure for telecom and establishes FinOps for telecom workloads.

Defines organizational cloud strategy for carrier-grade Kubernetes platforms spanning 5G core, edge, and enterprise telecom workloads. Evaluates multi-cloud architectures for telecom network function portability and regulatory compliance. Designs enterprise-grade telecom platform infrastructure and establishes FinOps practices for telecom compute cost governance.

Defines organizational network strategy for carrier-grade telecom platforms spanning multiple network generations and service types. Evaluates multi-vendor network architectures and designs enterprise-grade network automation platforms. Establishes FinOps practices for telecom network infrastructure cost governance and capacity planning at carrier scale.

Testing & QA · 3

Defines organizational QA strategy for carrier-grade telecom platforms spanning multiple generations of network technology. Builds quality engineering culture integrating protocol conformance testing, interoperability validation, and regulatory compliance verification. Implements platform testing solutions for automated multi-vendor network simulation and standards-based integration certification.

Load Testing Expert

Defines organizational performance testing strategy for telecom. Builds carrier-grade performance engineering culture across telecom teams. Implements platform solutions for automated load testing at telecom scale. Evaluates emerging technologies for next-generation telecom performance validation.

Unit Testing Expert

Defines organizational QA strategy for telecom systems: enterprise carrier-grade testing standards, cross-team protocol conformance governance, quality engineering frameworks for real-time communications. Implements platform-wide testing solutions for telecom system reliability.

Security · 1

Shapes the organization's network security vision for telecom infrastructure at scale: defines enterprise standards for carrier-grade network protection, drives adoption of 5G security frameworks (NESAS, SCAS), and establishes cross-departmental governance for signaling security (SS7, Diameter, HTTP/2). Influences industry standards bodies on telecom network security and evaluates emerging threats to next-generation network architectures.

AI-Assisted Development · 2

Defines organizational strategy for ChatGPT/Claude adoption across telecom engineering. Establishes enterprise-wide AI-assisted development frameworks for carrier-grade software balancing productivity with safety and regulatory compliance standards. Mentors leads and architects on strategic AI integration for telecom platform modernization.

Defines organizational GitHub Copilot strategy for telecom: evaluates enterprise AI-assisted development approaches for telecom platform teams, designs governance for AI-generated code in certification-critical telecom environments, establishes standards for responsible AI tool usage across telecom product development.

Observability & Monitoring · 4

OpenTelemetry Expert

Defines organizational observability strategy with OpenTelemetry for carrier-grade telecom platforms spanning multiple network generations. Implements enterprise-grade telemetry infrastructure for network function monitoring. Builds carrier-grade reliability culture integrating regulatory compliance. Establishes enterprise SLO framework for five-nines telecom service availability.

Defines organizational observability strategy for telecom platforms with Prometheus & Grafana: implements enterprise monitoring for multi-standard telecom services, builds reliability culture across telecom engineering, establishes enterprise SLO framework for telecom service quality at scale.

Defines organizational observability strategy for carrier-grade telecom platforms spanning multiple network generations — implements platform solutions for unified network monitoring, builds carrier-grade reliability culture with regulatory compliance integration, and establishes enterprise SLO framework for five-nines telecom service availability.

Defines organizational observability strategy for telecom platforms: implements enterprise monitoring infrastructure for multi-standard telecom services, builds reliability culture across telecom engineering teams, establishes enterprise SLO framework for telecom service quality at organizational scale.

Version Control & Collaboration · 2

Code Review Expert

Defines organizational code review strategy for telecom: enterprise telecom code review standards, cross-team protocol review governance, review culture maturity model for telecom development. Mentors leads on carrier-grade code review best practices.

Git Advanced Expert

Defines organizational Git strategy for telecom: evaluates enterprise approaches for multi-standard protocol repository management, designs governance for regulatory compliance tracking through version control, establishes standards for Git-based release management across telecom product lines and certification cycles.

Networking & Telecom · 13

Defines 5G Core Network strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

Defines BGP / OSPF Routing strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

DNS Deep Dive Expert

Defines DNS Deep Dive strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

Defines HTTP/2 and HTTP/3 QUIC strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

Defines Load Balancer Deep Dive L4/L7 strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

Defines Signaling Protocols strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

Defines Software-Defined Networking strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

Defines TCP/IP Deep Dive strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

Defines Telecom Billing Systems strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

Defines VoIP / SIP Protocol strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

WebRTC Expert

Defines WebRTC strategy at the organizational level. Establishes enterprise approaches. Mentors leads and architects.

Performance Engineering · 2

Defines organizational strategy for low-latency telecom infrastructure. Makes technology decisions on network architectures, real-time processing frameworks, and edge/MEC deployment strategies. Drives adoption of latency-aware engineering practices aligned with 5G/6G requirements. Shapes industry standards through contributions to telecom standards bodies and industry forums.

Defines the long-term throughput strategy for telecom platforms, balancing call processing capacity with infrastructure economics at carrier scale. Evaluates emerging standards like SIP-over-QUIC for throughput gains. Drives cross-organization alignment on signaling architecture evolution and media plane modernization to support next-generation network capacity demands.

Additional skills

Not assessed by the team, but part of the self-assessment and the development plan.

API DocumentationAWSCursor IDEDatabase IndexingE2E TestingGitHub Actions / GitLab CIGraphQL DesignJWT / OAuth2 / OIDCOWASP & Application SecurityPrompt Engineering for CodeQuery OptimizationSecure Coding PracticesSystem Design FundamentalsTerraformType Safety & Type Systems
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} in the open competency matrix: 58 skills across 5 levels. The matrix is free for individuals and stays free.