Systems Engineer at Sentinel managing on - premises infrastructure and enhancing client virtualization environments. Collaborating with internal partners in a hybrid work setup based in Troy, MI.
About the role
- Backend/Systems Engineer focusing on building identity and session systems for AI infrastructure at webAI. Design and implement secure and efficient backend systems for real-time, privacy-preserving experiences.
Responsibilities
- Design and build identity & session systems
- Implement auth flows, device registration, key management integrations, token/session lifecycle, and account recovery patterns.
- Support multi-device identity and secure device-to-account bindings.
- Ship sync and encrypted state primitives
- Build APIs and services that enable state sync across devices (event-based or state-based replication).
- Partner with client engineers to support end-to-end encrypted (E2EE) state where the server coordinates without needing plaintext access.
- Implement lightweight cloud coordination
- Create “coordination services,” not “big backend”: rendezvous, discovery, sequencing, fan-out, rate-limits, abuse controls, and reliability tooling.
- Prefer minimal durable state and clear boundaries; push logic to the edge/client when appropriate.
- Build real-time messaging, presence, and group chat capabilities
- Implement reliable messaging pipelines (delivery semantics, retries, ordering strategies, idempotency).
- Support presence and group membership (joins/leaves, device fan-out, read receipts/typing signals as needed).
- Integrate with pub/sub or streaming systems, and tune for latency.
- Edge-aware systems thinking
- Design for intermittent connectivity, offline-first behavior, device constraints, and high tail-latency networks.
- Make trade-offs explicit: consistency vs availability, ordering vs throughput, durability vs cost.
- Operate what you build
- Add observability (metrics, tracing, structured logging), define SLOs, and participate in on-call/incident response (lightweight rotation).
- Improve reliability: backpressure, load shedding, graceful degradation, and safe rollouts.
Requirements
- 3–6 years of backend/systems engineering experience (or equivalent impact).
- Strong fundamentals in distributed systems: consistency models, replication, idempotency, failure modes, and performance tuning.
- Experience building production services in at least one systems-friendly language (e.g., Go, Rust, Java, C++, Python) and comfort reading others.
- Familiarity with real-time systems: WebSockets, gRPC streaming, pub/sub, queues, or event-driven architectures.
- Experience designing APIs and data models with security and privacy in mind.
- Working knowledge of cloud infrastructure (AWS/GCP/Azure), containerization, and CI/CD.
Benefits
- Competitive salary and performance-based incentives.
- Comprehensive health, dental, and vision benefits package.
- 401k Match (US-based only)
- $200/mos Health and Wellness Stipend
- $400/year Continuing Education Credit
- $500/year Function Health subscription (US-based only)
- Free parking, for in-office employees
- Unlimited Approved PTO
- Parental Leave for Eligible Employees
- Supplemental Life Insurance
Job title
Job type
Experience level
Salary
Not specified
Degree requirement
Tech skills
Location requirements
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