Senior Software Engineer – Messaging & Agentic APIs

This is a fully remote position, open to applicants in Poland.

📋 Description

• Design, develop, and manage scalable backend services that enhance CreatorIQ’s email and messaging functionalities.

• Enhance existing messaging features within the PHP monolith and transition them into Node.js and TypeScript microservices.

• Evaluate legacy code, dependencies, and data flows to delineate service boundaries, APIs, data ownership, and migration strategies.

• Create agent-ready APIs for AI agents and external integrations.

• Establish secure integrations with Google Workspace, Microsoft 365, and various other communication providers.

• Develop customer-managed inboxes, domains, sender identities, and campaign-specific messaging automation.

• Design APIs, background jobs, queues, and event-driven workflows incorporating retries, rate limits, idempotency, and provider-failure handling.

• Enhance email authentication, deliverability, bounce and complaint processing, suppression management, and sender reputation.

• Contribute to React and TypeScript interfaces for messaging configuration, automation, and monitoring.

• Advance automated testing, observability, performance, and reliability.

• Collaborate with Product, Design, QA, DevOps, Architects, and engineering teams.

• Review code, mentor engineers, and leverage AI-assisted development tools.

⛳️ Requirements

• Over 5 years of professional software engineering experience, with ownership of complex production systems from design to deployment.

• Strong backend development skills in Node.js and TypeScript, along with React and TypeScript frontend development experience.

• Proficient in PHP with the capability to troubleshoot and improve legacy code.

• Experience in modernizing legacy applications and breaking down monoliths into microservices and serverless architectures.

• Expertise in designing REST and/or GraphQL APIs, third-party integrations, and asynchronous workflows.

• Ability to design machine-to-machine, AI-agent, and automated-workflow APIs with structured schemas and robust error handling.

• Strong grasp of relational databases, data modeling, transactions, query optimization, and scalable backend architecture.

• Familiarity with OAuth 2.0, identity providers, token management, rate limiting, retries, and resilient failure handling.

• Proficient in AWS or another leading cloud platform.

• Experience with event-driven architectures and tools like Kafka, Amazon SQS, SNS, or EventBridge.

• Knowledge of messaging, email, notification, or communication platforms.

• Familiarity with Google Workspace/Gmail APIs, Microsoft Graph/Outlook 365, SMTP, Amazon SES, SPF, DKIM, and DMARC.

• Experience in building AI-powered applications or agentic systems utilizing LLMs, AI agents, copilots, or workflow orchestration frameworks.

• Knowledge of JSON Schema, OpenAPI, function calling, and MCP or similar standards.

• Strong understanding of automated testing, CI/CD, observability, monitoring, and production support.

• Excellent problem-solving, communication, and collaboration abilities.

• Upper-Intermediate (B2) or higher English proficiency, both written and spoken.

🏝️ Benefits

• Learning platform and access to training/tools from day one.

• Surprise meal stipends.

• 26 days of vacation.

• Floating and fixed holidays.

• Wellness allowance.

• Paid parental leave.

• Medical insurance.

• Life insurance.

• Business travel insurance.

• Stock options as part of the equity-sharing program.

• Cell phone and internet stipends.

• Home office setup stipend.

• Mental wellness stipend.

• Professional development stipend.

• Tuition reimbursement.

• Occasional company-funded meal opportunities.