Work across Close's Python and TypeScript codebases, React frontend, APIs, containerized workloads, and AWS infrastructure. Responsibilities include threat modeling, finding and reproducing vulnerabilities, tuning and integrating SAST/DAST and other security tooling, owning vulnerability intake and remediation (including HackerOne bug bounty triage), dependency and secrets management, and supporting SOC 2 and audits.

First Staff GTM Analyst at a 100% remote US-based company. Responsible for making GTM data trustworthy by defining metrics, modeling the funnel from first touch to paid conversion, reconciling data across Snowflake, Segment, Amplitude, GA4 and ad platforms, explaining metric changes, forecasting outcomes, building semantic layers and guardrails for self-service analytics, and driving data-informed decisions with cross-functional stakeholders. Requires ~8 years hands-on technical analytics experience and proficiency with SQL, dbt, and modern analytics stacks.

Close is hiring a Senior Backend Engineer for the CRM team (USA-only, remote). Responsibilities include rearchitecting the core CRM data model, designing migrations, improving search and retrieval (Elasticsearch), shipping AI-native features (LLM-backed/agentic), and keeping hot paths fast. Tech stack: Python (Flask/FastAPI), MongoDB, PostgreSQL, Elasticsearch, Redis, TaskTiger, Docker, Kubernetes, and AWS (EKS, MSK, RDS, ElastiCache, EC2).

Close seeks a Senior/Staff-level Backend Engineer for a new Backend Platform team (one of the first hires). The role focuses on building internal developer platforms (DevDawg, Spice), shared API foundations (REST/GraphQL/OpenAPI), modernization of backend frameworks (Flask → FastAPI and others), observability and production readiness, eventing and migration guardrails, and constraints for safe use of coding agents. The stack includes Python, Flask, FastAPI, TaskTiger, MongoDB, PostgreSQL, Elasticsearch, Redis, Kafka, Docker, Kubernetes, AWS, Terraform, Ansible, and GitHub Actions. Position is USA-only and 100% remote.

Close is hiring a Senior Frontend Engineer (Marketing) to be the technical owner of its marketing website. The role requires ~5+ years building conversion-focused sites, experience with modern stacks (Astro, headless CMS like Sanity, Vercel), strong performance and technical SEO skills, analytics and experimentation instrumentation (Segment, Amplitude, Customer.io), and building tooling to enable marketing self-serve. The position is remote and limited to candidates in the USA.

Close is hiring a Senior Backend Engineer (US-only, remote) to build and operate Python Flask services, agentic AI features, and integrations. The role involves working with AWS (EKS, RDS, MSK, ElastiCache, EC2), databases (MongoDB, PostgreSQL, Elasticsearch, Redis), containerized deployments (Docker, Kubernetes), infrastructure-as-code (Terraform, Ansible), and modern AI tooling (Pydantic, Temporal, LangFuse). Candidates will join one of several backend teams focused on agents, communications, CRM, or growth and should have experience shipping production LLM-backed features and operating reliable services at scale.