Senior Back-End Engineer (Java/Spring Boot) – Fintech Infrastructure

nostro • Pakistan

Remote

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AI Summary

Design and build critical back-end systems for a fintech platform handling USD accounts, P2P transfers, and card transactions. Own end-to-end services in Java/Spring Boot, ensuring correctness, reliability, and security for financial operations. Collaborate with product, design, and operations teams to deliver scalable, auditable solutions for global earners.

Key Highlights

Build production-grade back-end services for financial transactions (accounts, ledgers, cards, P2P transfers) in Java/Spring Boot

Ensure correctness, idempotency, and auditability in systems handling real money

Work closely with product, design, and operations to deploy and maintain high-reliability financial infrastructure

Key Responsibilities

Design and implement Spring Boot services and REST APIs for accounts, ledgers, cards, payment links, and P2P transfers

Model data in PostgreSQL and write safe, efficient queries, transactions, and migrations with strict focus on correctness and auditability

Integrate with banking partners, card processors, and KYC/AML providers, handling webhooks, retries, and partial failures

Develop reconciliation and monitoring systems to detect discrepancies before impacting users

Write clean, tested code and conduct thoughtful code reviews to maintain high standards

Troubleshoot and resolve production issues, including participating in an on-call rotation

Improve CI/CD, deployment, and observability practices for the back-end systems

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Technical Skills Required

Java Spring Boot PostgreSQL

Benefits & Perks

Competitive salary: PKR 1,800,000 – PKR 2,700,000 per year

Fully remote work

The chance to build financial infrastructure impacting millions of users

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Nice to Have

Fintech experience in payments, banking, or wallet systems

Experience with card issuing, payment links, or cross-border/multi-currency payments

Regulatory/compliance knowledge (PCI DSS, KYC/AML, SBP regulations)

Database migrations with Flyway or Liquibase

Message queues or event-driven systems (e.g., Kafka, RabbitMQ)

AWS, Docker, and infrastructure-as-code experience

Job Description

Back-End Engineer (Java/Spring Boot)

Nostro · Remote (Pakistan) · Full-time · PKR 150,000 – 225,000/month

We will not consider applications without production Java/Spring Boot work, including those listing Java only in a skills section or from university projects.About Nostro

Nostro is built by global earners, for global earners. Millions of Pakistanis work with international clients and platforms, but getting paid, holding dollars, and spending them is still harder than it should be. We fix that with USD accounts, debit cards, payment links for charging clients, and instant peer-to-peer transfers, so our users can receive, hold, and grow their earnings without borders.

The role

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