Sr. Backend Engineer

Join LeapXpert: Innovating the Future of Business Communication

At LeapXpert, we've built the infrastructure that turns enterprise communication into intelligence enterprises can act on. As the leader in Governed Communication Intelligence, our platform enables employees to connect with clients on the consumer messaging channels they actually use, governs and captures every conversation as enterprise data, and converts that data into deployable intelligence for teams, AI agents, and the business decisions that matter. Governance is the foundation. Intelligence is the value.

Our mission: enable enterprises to build a governed communication infrastructure that makes trust structural, intelligence compound, and every client relationship more productive.
We recently announced an $180M growth investment and are recognized as a Visionary in the Gartner® Magic Quadrant™ for Digital Communications Governance and Archiving for the second consecutive year. Hundreds of the world's most demanding enterprises trust LeapXpert to power their most important client conversations every day.

This is just the beginning. We're growing fast and looking for sharp, driven people to help us define and build the Governed Communication Intelligence category. At LeapXpert, you'll work on high-impact projects, collaborate with ambitious teams across the globe, and help shape a platform that is rewriting how enterprises communicate, govern, and compete.

Apply now.

Why join us

Innovative Culture: Work at the cutting edge of business communication technology, with a product that’s changing the way Fortune 500 companies communicate.
Impactful Work: Your contributions will directly impact how millions of professionals connect and collaborate worldwide.
Global Team: Be part of a diverse, mission-driven team that values collaboration, innovation, and growth.
Growth Opportunities: With our rapid expansion, there are plenty of opportunities for professional growth and development.
Award-Winning Product: Join a company with a track record of success and recognition, including accolades like being named a Gartner Cool Vendor.

About the Role

Title: Sr. Backend Engineer

Function: Engineering

Reporting: Chief Architect

Location: San Francisco, CA (Hybrid)

We are building the runtime that powers AI agents across our enterprise communication platform: a multi-tenant execution sandbox, a durable orchestration backbone, and the SDKs and tools agents run on. We want builders, not just users: engineers who have stood up an agentic framework end to end, from the ground up, rather than wiring together someone else’s. You will own major subsystems and help set technical direction.

*What you’ll do *

• A multi-tenant execution sandbox for agents with strict, provable data isolation.
• The durable execution backbone on Temporal, so long-running agents survive failures, restarts, and retries.
• The agent harness and SDKs: tool-calling, context, model orchestration, and the eval and guardrail loops that keep behavior safe.
• MCP tool exposure and external runtime interop.
• Observability and audit infrastructure for agent execution.
• The failure model: error handling, resource limits, and graceful degradation.

*Skills and Qualifications *

• Built an agentic framework or runtime end-to-end, from the ground up, not just used one. You have designed the agent loop yourself: tool-calling, context management, multi-agent orchestration, eval and guardrail loops, and the failure modes specific to agents. You can speak to the trade-offs you made and what you would do differently.
• 6+ years building backend systems or distributed infrastructure at scale.
• Built SDKs or platforms that other engineers build on top of.
• Production use of AI-assisted dev tools (Claude Code, Codex, Gemini CLI, or similar) across the full lifecycle: spec, build, review, and deploy validation.
• Multi-tenant design with hard tenant isolation, ideally in a regulated space (financial services, healthcare).
• Async and concurrent execution patterns (goroutines, async/await, thread pools).
• Secure API design with authn/auth at the service boundary.
• Observability and instrumentation: logging, tracing, audit trails.

*Preferred Skills and Qualifications *

• Workflow orchestration (Temporal, Airflow, Prefect), especially agentic workflows in production.
• Managed agent runtimes (Claude Managed Agents, Bedrock Agents, Google Agent Builder, Azure AI Services).
• Runtime isolation and sandboxing.
• Deep familiarity with agent dev kits (Google ADK, Claude Agent SDK, OpenAI SDK, LangChain, CrewAI, AutoGen) at the level of their internals, not just their APIs.
• MCP or similar tool and extension systems.
• gRPC or modern RPC.
• Multi-provider key management; secrets and credential rotation.
• Event-driven architecture (streaming, queues, event sourcing; Kafka or similar).
• Knowledge graphs for grounding agents (Neo4j, or Obsidian-style linked stores).
• Audit and compliance in regulated industries (PCI-DSS, SOC 2).
• Enterprise communication or messaging platforms.

** Tech Stack**

Languages (fluent in two): Go, Python, TypeScript/Node.js, Rust.
Infra: Kubernetes, CI/CD, OpenTelemetry / Prometheus / Grafana, SQL / document/graph stores.
Security: threat modeling, secrets and rotation, audit trail design, data classification, and encryption.

Our Values

Curiosity: We’re curious and future-focused.
One Team: We’re one team, in many colors.
Customer–Driven: We’re obsessed with the customer.
Integrity: We don’t compromise on integrity.
Excellence: We exemplify excellence

What you’ll get

Great flexible healthcare plans from day one
Access to voluntary benefits, including FSA/ HSA
Supplemental Insurance
401k Employer Match
Unlimited PTO in a company that respects your time
Collaboration with driven, creative people from around the world
Opportunity to be at the forefront of tech innovation.
A fiercely inclusive, unapologetically diverse environment

LeapXpert values diversity and inclusion as critical components of our culture and success. We believe a diverse team with various backgrounds, experiences, and perspectives fosters creativity, innovation, and mutual respect. We are committed to creating a welcoming and supportive environment where everyone can thrive regardless of ethnicity, gender identity, sexual orientation, age, religion, or ability. We actively seek to recruit and retain talent from diverse communities and encourage all qualified candidates to apply. Please submit your resume for consideration.