Staff Backend Engineer - Users

About HighLevel:HighLevel is an AI-powered business operating system that gives agencies, entrepreneurs and SMBs the infrastructure to build, automate and scale. Today, HighLevel supports SMBs across 150+ countries, fueling community-driven growth rooted in real customer outcomes. To date, businesses operating on HighLevel have generated over $7 billion in ecosystem value, demonstrating the impact of shared infrastructure at scale. By centralizing conversations, automation and intelligence into one system, we help businesses move faster, reduce complexity and execute efficiently. Behind the platform, HighLevel powers more than 4 billion API hits and 2.5 billion message events daily. With 250 terabytes of distributed data, 250+ microservices and over 1 million domain names supported, our architecture is built for performance, resilience and long-term scalability. Our people With over 2,000 team members across 10+ countries, HighLevel operates as a global, remote-first organization built for speed and ownership. We value initiative, clarity and execution, creating space for ambitious people to build systems that support millions of businesses worldwide. Here, innovation thrives, ideas are celebrated and people come first, no matter where they call home. Our impact Every month, HighLevel enables more than 1.5 billion messages, 200 million leads and 20 million conversations for the more than 1 million businesses we support. Behind those numbers are real people building independence, expanding opportunity and creating measurable impact. We’re proud to be a part of that. Learn more about us on our YouTube Channel or Blog Posts     Role Summary: As a Staff Engineer on the Users team, you will be the technical anchor for identity, access, auditing, notifications and security foundations across our multi-tenant SaaS platform. This role is not about feature velocity - it’s about building systems that are correct, resilient, and safe by default, and enabling other teams to move fast without breaking trust.   You’ll work closely with EMs, Product, and other engineers to design and evolve core primitives such as users, roles, permissions, tokens, and tenant isolation, auditing, notifications - at scale. Responsibilities:

Design and evolve secure multi-tenant architectures (Agency → Account → App or equivalent hierarchy) for 100k+ agencies

Define and enforce tenant isolation guarantees at data, API, and infra levels

Build and review authorization models (RBAC / ABAC / hybrid)

Own token systems (API keys, OAuth flows, JWTs, scoped tokens, rotation, expiry)

Design fine-grained scopes for internal APIs, public APIs, and partner integrations

Map scopes → permissions → resources consistently

Prevent over-scoped tokens and privilege escalation

Lead security-critical backend designs (authZ boundaries, impersonation, auditability)

Set patterns for secure-by-default APIs used by internal and external teams

Partner with Infra/Security teams on Secrets management, Key rotation, Rate limiting & abuse prevention, Compliance readiness (SOC2 style thinking)

Act as a multiplier: raise the security bar across engineering via reviews, RFCs, and mentoring

Requirements:

8+ years of backend engineering experience

Proven experience building secure, multi-tenant SaaS platforms

Deep understanding of: Authorization models (RBAC, ABAC), OAuth2 / JWT / API key systems, Threat modeling & security tradeoffs

Strong system design skills - especially for long-lived platformsComfort owning ambiguous, high-impact areas

Nice to have:

Experience designing platforms used by multiple internal teams

Security reviews, incident learnings, or compliance exposure

Experience with large-scale migrations (auth or identity related)

Background in developer platforms or core infrastructure teams