Principal Software Engineer Job at Microsoft Corporation (Sydney)

Job Description

Azure Front Door (AFD) is the global edge for Microsoft and many of our customers—accelerating and protecting internet-scale apps with ultra-low latency, high availability, and robust security. The Dataplane team builds and operates high-performance edge services behind traffic termination, TLS/QUIC, HTTP/2–3, routing, caching, rate limiting, and L4/L7 DDoS protections that keep Microsoft and customer workloads safe and fast worldwide. As a Principal Software Engineer, you’ll architect low-latency proxies, advance HTTP/3, strengthen L4/L7 DDoS defenses, and lead reliability at global scale. You’ll set technical direction, mentor engineers, and partner across Azure to deliver secure, fast, and resilient internet-facing experiences.

Job Responsibility

Architect and build internet-scale, low-latency edge services (proxies, load balancers, TLS offload, routing pipelines, caching layers) across hundreds of global sites and thousands of nodes
Design and build services that provide L4/L7 DDoS protection, HTTP-level CDN, global load balancing, and WAF capabilities
Lead reliability by design: champion SLOs, error budgets, and graceful degradation patterns
instrument systems end-to-end (metrics/traces/logs), drive telemetry-driven engineering and automated mitigations
Lead identification of dependencies and development of design documents for products, applications, services, or platforms
Mentor engineers and lead by example to produce extensible and maintainable code used across products
Own live-site for AFD services: participate in DRI/on-call, guide incident response, lead post-incident reviews, and convert findings into systemic fixes and automation
Proactively seek new knowledge and adapt to trends, technical solutions, and patterns that improve availability, reliability, efficiency, observability, and performance at scale

Requirements

Bachelor's degree in computer science, or related technical discipline AND 10+ years building and operating distributed systems or networking platforms in production
track record of delivering high‑throughput, low‑latency services
Strong systems programming proficiency in C/C++ and/or Rust (Go acceptable) with deep understanding of memory, concurrency, async I/O, and performance profiling (perf/eBPF/flamegraphs)
Expertise in networking & protocols: TCP/UDP, DNS, TLS, HTTP/1.1–3, QUIC
load balancing algorithms
congestion control
connection pooling
keep‑alive
retry/backoff
Linux fundamentals (kernel & networking stack), containerization/orchestration (Kubernetes), CI/CD, safe releases, and observability (metrics/traces/logs)
Proven live‑site leadership: incident command, debugging in production, mitigation design, and preventative engineering at scale
Experience building services on cloud platforms such as Azure or AWS
Ability to meet Microsoft, customer, and/or government security screening requirements, including: Microsoft Cloud Background Check: Required upon hire/transfer and every two years thereafter

Nice to have

Master’s Degree in Computer Science or related technical field AND 8+ years of technical engineering experience with coding in languages including C, C++, C#, Rust, Java, JavaScript, or Python
OR Bachelor’s Degree in Computer Science or related technical field AND 10+ years of technical engineering experience with coding in the above languages
CDN/edge proxy experience (e.g., NGINX/Envoy/ATS) or custom proxy pipelines
DDoS mitigation (L3/4 and L7), rate limiting, abuse detection, traffic shaping, and resiliency patterns (hedged requests, circuit breakers)
At‑scale telemetry systems (e.g., Kusto/Geneva), capacity planning, and performance/COGS optimization
Cryptography/TLS internals, certificate lifecycle, HSM/KMS integrations
Experience with Azure networking/compute primitives and large multi‑tenant services

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Principal Software Engineer

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