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

Requirements:

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