Senior Software Engineer - Messaging & Agentic APIs

CreatorIQ is the operating system for creator-led growth trusted by more than 1,300 global brands and agencies. We’re on a mission to make businesses more human, and humans more impactful. We operate by our values — be intentional, pursue excellence every day, embrace the journey together, and be a good human — every day. CreatorIQ has earned the title of best companies to work for in multiple programs, including BuiltIn LA and NY. It’s been named a Fastest-Growing Company in North America on the Deloitte Technology Fast 500™ for four years, was named a leader in IDC MarketScape: Worldwide Influencer Marketing Platforms for Large Enterprises in 2025, was named a Leader by The Forrester New Wave™: Influencer Marketing Solutions, and has been consistently recognized by G2 as a Leader, and is rated 5 stars on Influencer MarketingHub. We operate in a flexible work model that combines both in-person and remote work to boost collaboration, enhance innovation, and adapt to individual work styles. We're seeking passionate, innovative minds to join our journey. Be a part of our dynamic team and let's transform the industry together! SENIOR SOFTWARE ENGINEER - MESSAGING & AGENTIC APIS We are looking for a Senior Software Engineer, Full Stack – Messaging & Agentic APIs to join our Messaging team and help shape the next generation of CreatorIQ's creator communication platform. This is a full-stack role with a strong backend focus, where you'll design, build, and scale messaging capabilities that power creator communications across our platform. You'll work on both our existing infrastructure and new cloud-native services, helping modernize CreatorIQ's messaging architecture while building APIs that support web applications, external integrations, and next-generation AI agent workflows. Our current messaging platform is part of a large PHP-based monolithic application. As we continue migrating functionality into independently deployable microservices built with Node.js and TypeScript, you'll play a key role in both maintaining the existing PHP codebase and designing the future-state architecture. This requires someone who can confidently troubleshoot legacy systems while building scalable, modern backend services. In this role, you'll work on features such as business inbox integrations, custom sender identities, messaging automation, campaign-specific workflows, reliable message delivery at scale, and agent-ready APIs. While the primary focus is backend engineering, you'll also contribute to React and TypeScript front-end development when needed, collaborating closely with Product, Design, and Engineering teams to deliver high-quality end-to-end solutions. In this role, you’ll get to: - Design, develop, and operate scalable backend services supporting CreatorIQ’s email and messaging capabilities. - Understand and improve existing messaging functionality within our PHP monolith while helping migrate it into Node.js and TypeScript microservices. - Analyze legacy code, dependencies, and data flows to define service boundaries, APIs, data ownership, and safe migration strategies. - Design agent-ready APIs and capabilities that are discoverable, well-documented, predictable, and safe for use by AI agents and external integrations. - Build secure integrations with Google Workspace, Microsoft 365, and other external communication providers. - Develop capabilities for customer-managed inboxes, domains, sender identities, and campaign-specific messaging automation. - Design APIs, background jobs, queues, and event-driven workflows with reliable handling of retries, rate limits, idempotency, and provider failures. - Improve email authentication, deliverability, bounce and complaint processing, suppression management, and sender reputation. - Contribute to React and TypeScript user interfaces for messaging configuration, automation, and monitoring. - Improve automated testing, observability, performance, and reliability across legacy and new servic…