Position

Senior Software Engineer

About The Position

Justt helps many of the world’s largest and most recognizable brands turn chargebacks from a constant headache into a managed, predictable part of doing business. Our AI-driven platform powers chargeback operations at scale, automating disputes end to end, recovering revenue that would otherwise be lost, and removing a major operational burden from finance, risk, and operations teams across multiple regions and verticals.

We’re a global company with teams across markets, and disciplines, working closely with leading players in the payments ecosystem. Our culture is built on clear thinking, collaboration, and a strong sense of ownership. At Justt, you’ll partner with product, engineering, data, success and go-to-market teams to build technology that sits at the core of modern payments, and has a direct, measurable impact on the bottom line for some of the biggest companies in the world.

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

Requirements

Must Have

  • 5+ years of backend development experience
  • Strong proficiency in Node.js and TypeScript
  • 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
  • Experience in using and implementing AI tools in a professional setting

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
  • Experience with NestJS and Nx Monorepo

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