Senior Software Engineer

Justt is a global leader in combating illegitimate chargebacks for merchants. Our chargeback mitigation solution combines advanced technology and deep payment expertise to efficiently handle disputes, enabling merchants to focus on growth.

About the Role

Justt is seeking a Senior Software Engineer to join the Justt team, which is responsible for the core of Justt's chargeback resolution platform. This role involves managing our central data pipeline, from ingesting chargeback data from Payment Service Providers (PSPs) to submitting dispute responses back to them.

This position offers more than standard integrations; you will be tasked with designing and scaling the infrastructure for mission-critical data flows, addressing complex issues in distributed systems, API orchestration, and data integrity.

Key Responsibilities

• Own the full lifecycle of PSP integrations and data pipeline systems
• Architect scalable backend services using Node.js, TypeScript, and NestJS
• Ensure data integrity across PostgreSQL and MongoDB at scale
• Drive architectural decisions and system design within our Nx monorepo
• Mentor team members and contribute to engineering best practices

What We Offer

• Solve complex technical problems with real impact
• Engineering-driven culture with talented peers
• Significant ownership over architecture and product
• Modern stack: Node.js, TypeScript, NestJS, Nx, PostgreSQL, MongoDB, AWS
• Growth opportunities in a fast-paced fintech company

Must Have

• 5+ years of backend development experience
• Strong proficiency in Node.js and TypeScript
• Experience with NestJS and Nx Monorepo
• Deep knowledge of PostgreSQL and MongoDB
• Proven experience building scalable APIs and distributed systems
• Cloud infrastructure experience (AWS preferred)
• Strong problem-solving skills and ownership mindset

Nice to Have

• Experience with payment systems or fintech
• Background in high-throughput, data-intensive systems
• Kubernetes and Docker experience
• Contributions to open-source projects