Senior TypeScript Backend Engineer - CoreApps Platform Jobs

Groupon

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IT - Software Development

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Job Description:

Join the CoreApps Platform team, the foundational engineering group at Groupon responsible for the global commerce engine. Our platform handles every customer interaction and transaction worldwide. This is a high-impact, senior-level Individual Contributor (IC) role with a dual mandate: ensuring KTLO stability at massive scale and accelerating a major platform modernization effort using an AI-first approach. You will own mission-critical services that handle 100,000+ Requests Per Minute (RPM) and champion the shift from legacy Java/Ruby systems to a cutting-edge TypeScript/Node.js microservices architecture, leveraging state-of-the-art AI coding tools to achieve unprecedented speed and quality.

Job Responsibility:

Architect and Develop high-throughput, low-latency Core Platform services (e.g., API Gateway, Deal Catalog, User Identity)
Drive Modernization by actively refactoring and migrating critical services from legacy stacks to a modern TypeScript/Node.js microservices architecture
Champion AI-Assisted Development by leveraging AI coding tools (e.g., Copilot, Cursor) to accelerate feature delivery, navigate complex codebases, and mentor team members on best practices
Ensure Operational Excellence for global, production systems, including incident response, system resilience design (circuit breakers, retry logic), and participation in the on-call rotation
Design Distributed Systems that are fault-tolerant, self-healing, and resilient, including sophisticated caching and rate-limiting strategies
Own Complex Commerce Logic for financial systems, order management, and payment processing within the platform

Requirements:

6+ years of professional backend software development experience (or 3+ years with proven, exceptional AI-driven impact)
Strong professional experience in building backend systems with TypeScript and Node.js
Mandatory: Proven track record using AI coding tools (e.g., Cursor, GitHub Copilot, Claude Code) to successfully deliver production features and refactor complex, multi-service codebases
Proven experience designing and building high-throughput distributed systems (e.g., handling 100K+ RPM)
Strong understanding of microservices, event-driven architecture (e.g., Kafka), and transactional systems
Proficiency with SQL/NoSQL databases (MySQL/PostgreSQL, MongoDB) and leveraging Kubernetes in a cloud environment (GCP/AWS)

Nice to have:

Prior experience with Java, J2EE, or Ruby (to aid in migration/refactoring)
Familiarity with complex e-commerce or marketplace platform logic
Knowledge of modern orchestration patterns (e.g., Temporal)
Deep expertise in cloud infrastructure and services (GCP/AWS)

Additional Information:

Job Posted:
December 09, 2025

Work Type:

Remote work

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Senior TypeScript Backend Engineer - CoreApps Platform