{"id":1919876,"url":"https://alion.io/job/upwork-109-backend-software-engineer-payments-platform","title":"#109 - Backend Software Engineer - Payments Platform","company":{"id":3606,"name":"Upwork","domain":"upwork.com","url":"https://alion.io/company/upwork","size_band":"1001-5000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"SmartRecruiters","truth_index":{"grade":"B","score":80,"open_postings":6,"ghost_share":0,"stale_share":1,"repost_share":0,"time_to_fill_p50_days":18,"computed_at":"2026-10-10T05:45:15Z"}},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"contractor","work_mode":"remote","remote_scope":"stated_regions","remote_scope_basis":"posting_text","remote_working_hours":{"label":"IST","utc_offset_min":5.5,"utc_offset_max":5.5},"hiring_geo_confidence":"explicit","locations":["Hyderabad, India"],"countries":["IN"],"hiring_countries":["CN","IN","JP","AU","ID","MY","NZ","PK","PH","KR","TW","TH","VN","AS","BD","BT","BN","KH","CK","TL","FJ","PF","GU","KI","LA","MV","MH","MN","NR","NP","NC","NU","NF","MP","PW","PG","PN","WS","SB","LK"],"hiring_countries_total":47,"salary":null,"salary_estimate":{"min_usd":19000,"max_usd":42000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":18},"experience_years_min":5,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"Amazon Aurora","optional":false},{"name":"Apache Kafka","optional":false},{"name":"AWS","optional":false},{"name":"CI/CD","optional":false},{"name":"Claude","optional":false},{"name":"Copilot","optional":false},{"name":"Datadog","optional":false},{"name":"GitLab CI","optional":false},{"name":"Gradle","optional":false},{"name":"GraphQL","optional":false},{"name":"Hibernate","optional":false},{"name":"Java","optional":false},{"name":"JUnit","optional":false},{"name":"Kotlin","optional":false},{"name":"Mockito","optional":false},{"name":"MySQL","optional":false},{"name":"RabbitMQ","optional":false},{"name":"Rest API","optional":false},{"name":"Spring Boot","optional":false},{"name":"Spring Data JPA","optional":false},{"name":"DynamoDB","optional":true}],"status":"live","first_seen_at":"2026-10-05T17:21:02Z","employer_posted_date":"2026-10-05","last_verified_at":"2026-10-11T18:15:03Z","board_verified":true,"closed_at":null,"days_open":6,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":6},"description":"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.\nEnterprise experience is strongly preferred.\n Key Responsibilities\nDevelop and maintain production Java and Spring Boot services for a payments platform.\nAdd new payment methods and deliver features, bug fixes, and reliability improvements.\nDeliver production-ready changes through GitLab CI, with unit and integration test coverage that meets JaCoCo quality gates.\nImprove observability and resilience, and support safe canary and production deployments gated by Datadog monitors.\n Must-Have Skills\n5+ years of backend engineering experience with Java and Spring Boot in production microservices.\nMid-to-senior-level experience with demonstrated ownership of production services in a distributed systems environment.\nExperience building GraphQL APIs with Netflix DGS or consuming APIs through the Apollo Java/Kotlin client. Apollo GraphQL client experience is required.\nHands-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.\nStrong JPA/Hibernate and Spring Data JPA experience with MySQL/Aurora, including:Transactional design\nOptimistic locking\nWriting JPA entities\nManaging production schema migrations\n\nExperience writing JUnit 5 unit tests with Mockito and integration tests against live environments.\nProficiency with Gradle multi-module builds.\nExperience with GitLab CI/CD and Datadog metrics and monitors, including using Datadog monitors as deployment quality gates.\nResponsible use of AI coding assistants, such as GitHub Copilot or Claude, while maintaining code quality and correctness.\nExperience with financial-grade backend systems requiring correctness, idempotency, and consistency.\nAbility to reason clearly about transactional boundaries across external systems, such as a third-party billing platform and a local metadata store.\nExperience designing idempotent event handlers.\nExperience integrating external REST- or SDK-based third-party platforms.\nNice-to-Have Skills\nSpring Boot 3 experience.\nPrior billing or payments domain experience.\nDynamoDB with AWS SDK v2 and/or MongoDB with Spring Data in a multi-store architecture.\nNetflix DGS experience.\nRequired Tools & Platforms\nJava and Spring Boot\nGraphQL and the Apollo Java/Kotlin client\nAWS SQS, Apache Kafka, or RabbitMQ\nJPA/Hibernate, Spring Data JPA, and MySQL/Aurora\nJUnit 5 and Mockito\nGradle\nGitLab CI/CD\nJaCoCo\nDatadog\nAI coding assistants used responsibly, such as GitHub Copilot or Claude\nLocation, Time & Engagement\nCandidates must be based in an eligible APAC location.\nWorking-hour coverage aligned with India Standard Time (IST) is 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