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.

Qualifications

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.

Additional Information

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.