#109 - Backend Software Engineer - Payments Platform

Upwork; Hyderabad; Presencial; INR 2.400.000 - 5.200.000; Jornada completa

Descripción de la vacante

Upwork is seeking a hands-on Backend Software Engineer to build and maintain payment services in a distributed financial systems environment in India. You will add payment capabilities, deliver features and bug fixes, and improve reliability of production Java and Spring Boot services.

Enterprise experience is strongly preferred. You will own production services, implement GraphQL APIs, and ensure robust event-driven processing with AWS SQS, Kafka, or RabbitMQ.

Formación

• 5+ years of backend engineering experience with Java and Spring Boot in production microservices.
• Ownership of production services in distributed systems.
• Experience building GraphQL APIs with Netflix DGS or Apollo GraphQL client.
• Hands-on experience with AWS SQS, Kafka, or RabbitMQ in event-driven systems.
• Strong JPA/Hibernate and Spring Data JPA with MySQL/Aurora; including transactional design and migrations.
• JUnit 5 tests with Mockito; integration tests against live environments.
• Proficiency with Gradle multi-module builds.
• GitLab CI/CD and Datadog metrics/monitors usage.
• Responsible use of AI coding assistants.
• Experience with financial-grade backend systems requiring correctness and idempotency.
• Ability to reason about transactional boundaries across external systems.
• Designing idempotent event handlers.
• Integrating external REST or SDK platforms.

Responsabilidades

• Develop and maintain production Java/Spring Boot services for a payments platform.
• Add new payment methods and deliver features, bug fixes, and reliability improvements.
• Deliver production-ready changes through GitLab CI with unit/integration tests and JaCoCo gates.
• Improve observability, resilience, and support safe canary deployments gated by Datadog monitors.

Conocimientos

Java & Spring Boot

Production microservices ownership

GraphQL APIs

Event-driven architectures

JPA/Hibernate & Spring Data JPA

JUnit 5 & Mockito

Gradle

GitLab CI/CD

Datadog metrics & monitors

AI coding assistants usage

Transactional boundaries & idempotency

Idempotent event handling

REST/SKD integrations

Herramientas

Apollo GraphQL client

Netflix DGS

AWS SQS

Apache Kafka

RabbitMQ

Gradle

GitLab CI/CD

Datadog

JaCoCo

Copilot/Claude

Descripción del empleo

We are seeking a hands-on Backend Software Engineer to build and maintain payment services in a distributed financial systems environment. You will add new payment capabilities, deliver features and bug fixes, and improve the reliability of production Java and Spring Boot services.

Job Description

Enterprise experience is strongly preferred.

Key Responsibilities

• Develop and maintain production Java and Spring Boot services for a payments platform.
• Add new payment methods and deliver features, bug fixes, and reliability improvements.
• Deliver production-ready changes through GitLab CI, with unit and integration test coverage that meets JaCoCo quality gates.
• Improve observability and resilience, and support safe canary and production deployments gated by Datadog monitors.

Qualifications

Must-Have Skills

• 5+ years of backend engineering experience with Java and Spring Boot in production microservices.
• Mid-to-senior-level experience with demonstrated ownership of production services in a distributed systems environment.
• Experience building GraphQL APIs with Netflix DGS or consuming APIs through the Apollo Java/Kotlin client. Apollo GraphQL client experience is required.
• Hands-on experience with AWS SQS, Apache Kafka, or RabbitMQ in event-driven distributed systems, including building or maintaining a production Spring Boot service that consumes events.
• Strong JPA/Hibernate and Spring Data JPA experience with MySQL/Aurora, including:
  • Transactional design
  • Optimistic locking
  • Writing JPA entities
  • Managing production schema migrations
• Experience writing JUnit 5 unit tests with Mockito and integration tests against live environments.
• Proficiency with Gradle multi-module builds.
• Experience with GitLab CI/CD and Datadog metrics and monitors, including using Datadog monitors as deployment quality gates.
• Responsible use of AI coding assistants, such as GitHub Copilot or Claude, while maintaining code quality and correctness.
• Experience with financial-grade backend systems requiring correctness, idempotency, and consistency.
• Ability to reason clearly about transactional boundaries across external systems, such as a third-party billing platform and a local metadata store.
• Experience designing idempotent event handlers.
• Experience integrating external REST- or SDK-based third-party platforms.

Nice-to-Have Skills

• Spring Boot 3 experience.
• Prior billing or payments domain experience.
• DynamoDB with AWS SDK v2 and/or MongoDB with Spring Data in a multi-store architecture.
• Netflix DGS experience.

Required Tools & Platforms

• Java and Spring Boot
• GraphQL and the Apollo Java/Kotlin client
• AWS SQS, Apache Kafka, or RabbitMQ
• JPA/Hibernate, Spring Data JPA, and MySQL/Aurora
• JUnit 5 and Mockito
• Gradle
• GitLab CI/CD
• JaCoCo
• Datadog
• AI coding assistants used responsibly, such as GitHub Copilot or Claude

Location, Time & Engagement

• Candidates must be based in an eligible APAC location.
• Working-hour coverage aligned with India Standard Time (IST) is required.