Senior Integrations Engineer

Location: Remote. Must overlap with US Eastern/Central time zonesCompany: Introzy (subsidiary of Sanguine Technology Solutions)Type: Full-time or contractor-to-hireAbout UsSanguine is the parent company behind Introzy, our core product — a multi-app platform (including Funlz and Profylz) designed to unify networking, workflow, and productivity. We’re an early-stage company moving fast to deliver value, with a lean engineering team, clear priorities, and a culture that embraces AI as a core development partner.We’re standardizing on a simple, vanilla, AI-friendly stack: React, Node.js with Express, PostgreSQL, AWS, and GitHub Actions for CI/CD. Our goal is to build reliable, scalable systems that are easy to extend and maintain while shipping quickly.About Sanguine Technology SolutionsSanguine Technology Solutions is the technology engine of the Sanguine portfolio, 2024 Inc. 5000 #94. Its mission is to build category-defining software that addresses high-friction, high-value problems for small and mid-sized businesses. From partner operations (Introzy) and intelligent surveys (Funlz) to AI-powered automation and custom SaaS, STS delivers tools that help businesses grow faster, with more clarity and less chaos.The RoleOwn partner integrations end-to-end. You’ll design, build, and maintain integrations and automations across APIs, webhooks, and OAuth. This role is hands-on with high ownership and direct impact on product velocity as we ship Introzy 2.0.What You’ll DoBuild Introzy’s external developer platform: public APIs, webhooks, SDKs, and MCPs with strong auth, versioning, documentation, and examples to enable partners and customers to build their own integrationsBuild and maintain partner integrations and data syncs via REST/GraphQL APIs, webhooks, and OAuth flowsDesign resilient integration patterns: retries, backoff, idempotency, rate limiting, and observabilityCreate internal tooling and admin surfaces for monitoring, replays, and customer supportCollaborate with Product/CS on integration requirements, scopes, and customer rolloutsEstablish clear contracts and versioning for integrations using OpenAPI and typed clientsContribute across the stack when needed (React UI for setup, Node jobs, SQL migrations)Our Stack and ToolsTypeScript, Node.js/Express, React, PostgreSQLAuth/Authz: Clerk (using built-in OAuth providers initially). Webhooks. Message queue: Redis. Background jobsCI/CD: GitHub Actions. Hosting on Render and modern PaaSAnalytics/telemetry: Segment, Sentry, AmplitudeExample IntegrationsCRM: HubSpot, Attio, SalesforceE‑Sign and CLM: DocuSignCommunications and Scheduling: Google Workspace (Gmail/Calendar)Marketing Automation and Social/Ads: partner tools as prioritizedContacts Import: common address book and CSV sourcesPayments: partner payment providers as prioritizedThese map to our current categories: CRM, E‑Sign/CLM, Communications API, Scheduling, Marketing Automation, Social/Ads, Contacts Import, and Payments. We’ll stage builds based on impact, mutual customers, and engineering effort.CRM and workflow: HubSpot, AttioAgreements and documents: DocuSignAutomation platforms: Zapier and webhooks-first partnersFuture: calendar/email connectors, billing, and additional PRM/PLG toolingWhat We’re Looking For4+ years building production integrations or platform services in TypeScript/Node or similarStrong fluency with OAuth, webhooks, pagination, rate limits, and backoff/idempotency patternsSolid SQL fundamentals and comfort designing schemas for sync, audit, and replayPragmatic approach to reliability: logging, tracing, metrics, alarms, and customer-facing statusExcellent written communication and bias to action in a lean, high-ownership environmentNice to HaveExperience with React for integration setup UIs and admin toolsPrior work with Segment, Sentry, and AmplitudeExperience defining OpenAPI specs and generating clientsBackground jobs and queues at scale; data migration playbooksWhy JoinDirect ownership of a critical product surface with executive visibilityShip fast on a modern, straightforward stack; lean team with clear prioritiesOpportunity to shape Introzy’s Integration Platform and best practices from the ground up