Principal Software Development Engineer (Microservices)

Zscaler (NASDAQ: ZS) accelerates digital transformation so customers can be more agile, efficient, resilient, and secure. The Zscaler Zero Trust Exchange platform protects thousands of customers from cyberattacks and data loss by securely connecting users, devices, and applications in any location. Distributed across 200+ public data centers globally and thousands of private sites at the edge, the SASE-based Zero Trust Exchange is the world’s largest in-line cloud security platform.

We believe the future of work is Human + AI and are building an AI-native enterprise where human potential is amplified by machine intelligence to solve the world’s hardest security challenges. Driven by deep customer obsession, we are committed to the mission, outcome, and to each other. We bring these commitments to life through three core behaviors: ownership and collaboration, trust through outcomes and impact, and a challenge culture with ongoing feedback. Ready to make an impact at the company pioneering security transformation in the AI era? Join us at Zscaler.

We are looking for a Principal Software Development Engineer (Microservices) to join our team. This is a hybrid role (in Santa Clara, CA office, minimum 3 days per week), reporting to the Senior Director, Software Development Engineering in the Engineering ZIA Core department. You will work on the control plane for the Zscaler Internet Access (ZIA) product, helping evolve the platform to meet massive scale with cloud-native, microservices-based architecture.

What you’ll do (Role Expectations)

• Lead the technical roadmap to modernize the ZIA control plane using API-first, domain-aligned microservices with clear service ownership and multi-region architectures (active-active, failover, disaster recovery)

• Design, develop, and operate low-latency, event-driven services end to end (API through storage) utilizing resilience patterns, progressive delivery (blue/green, canary, feature flags), GitOps workflows (Argo CD/Flux), and safe rollout/rollback strategies

• Drive engineering excellence through standards, code reviews, testing, paved-road patterns, API and event contract governance (versioning, consumer-driven contracts, schema registry, DLQs), and cross-functional partnerships across Product, SRE, Security, Data, and Architecture while representing designs in customer/partner forums

• Own service reliability and operability end to end, including SLI/SLOs (p95/p99 latency, availability), SLO-based alerting, error budgets, incident response, postmortems, and advanced observability with distributed tracing (OpenTelemetry, Jaeger/Tempo) and structured logging

• Embed microservices security (OAuth2/OIDC, mTLS, service-to-service authZ, KMS/Vault), supply-chain integrity (SBOM, SLSA), performance optimization, capacity planning, and cloud spend/autoscaling across AWS primitives

Who You Are (Success Profile)

• You thrive in ambiguity and are comfortable building the path as you walk it, viewing unstructured environments as raw material to build something meaningful.

• You act like an owner with a passion for the mission, operating with integrity, a bias for action, and the agility to navigate between high-level strategy and hands-on execution.

• You are a problem-solver who is energized by complex technical challenges and driven to deliver high-impact solutions.

• You are a high-trust collaborator who builds strong team relationships, embracing continuous feedback, candor, and respect to earn trust and achieve shared goals.

• You are a learner with a growth mindset, constantly seeking feedback and developing your skills with purpose to become a stronger teammate.

What We’re Looking for (Minimum