#138512 - Backend Software Engineer - Payments

We are seeking a backend software engineer for a remote contract engagement building and operating scalable, revenue-critical payment infrastructure. You will deliver payment features, reduce technical debt, and modernize services while collaborating with engineers, product managers, and partner teams. Enterprise experience strongly preferred. Key Responsibilities Implement production backend features for payment flows. Refactor legacy services, improve test coverage, and modernize APIs, including migrations from deprecated APIs. Deliver clean, well-tested, production-ready code with passing CI/CD pipelines and peer-review approval. Deliver initiatives within agreed sprint cycles and participate in code reviews, design discussions, and sprint ceremonies. Clarify requirements with product managers and partner teams and deliver end-to-end solutions. Produce designs, API specifications, knowledge-transfer documentation, and runbooks for owned workstreams. Support maintainability and a smooth handoff to the engineering team at the conclusion of the engagement. Must-Have Skills 3+ years of backend software engineering experience. Experience building and operating production backend services at scale. Strong proficiency in Java as the primary programming language, with Kotlin and Python as complementary skills. Hands-on experience with RESTful and GraphQL APIs, microservices, and event-driven systems. Payments, fintech, or billing domain experience, including gateways, processors, or payment service providers. Experience writing unit, integration, and contract tests. Agile/Scrum experience with sprint-based delivery. Ability to ramp quickly on an existing codebase with minimal guidance. Git-based version control and code review using GitLab. Hands-on experience with GitLab CI/CD pipelines. Relational database experience with MySQL and SQL. Distributed systems experience with message queues, asynchronous processing, and eventual consistency. Jira experience for task and sprint tracking. Experience building end-to-end backend payment flows in production, including charges, refunds, disputes, and webhooks. Legacy service refactoring or migration experience with regression testing. Experience resolving production incidents in payment or billing systems. Experience designing internal APIs consumed by multiple downstream services. Ability to own feature delivery with minimal supervision and collaborate asynchronously with distributed, cross-functional teams. Nice-to-Have Skills Experience in a large enterprise engineering organization. Experience with Spring Boot, Gradle, and service mesh technologies. PCI-DSS compliance, payment security, or financial data handling experience. Experience with Datadog observability tooling. Open-source contributions or a portfolio of shipped payment features. Required Tools & Platforms Java, with Kotlin and Python as complementary languages. RESTful and GraphQL APIs, microservices, and event-driven systems. Git, GitLab, and GitLab CI/CD. MySQL and SQL. Message queues and asynchronous processing systems. Jira. Location, Time & Engagement Candidates must be based in India or a nearby eligible APAC location no more than two hours ahead of or behind India Standard Time (IST). IST support is required, preferably 10 AM to 7 PM IST. Remote contract engagement, 40 hours per week. Expected engagement through March 31, 2027; start date to be agreed. One opening is available. This is not currently a contract-to-hire opportunity. Originally posted on Himalayas