##### Project description Modernization project for the core business systems of a major US airline. ##### Responsibilities Design and implement a rules engine in Java 17+ that evaluates events against parameterized, effective-dated rules Implement rules as code: versioned, parameterized, valid for defined effective-date ranges, with a clear explanation of every evaluation result Build robust date and time logic: time zones, DST transitions, rolling windows, and cumulative limits Develop event-driven services on Kafka (Amazon MSK) that consume events, evaluate rules, and publish alerts, with guaranteed ordering, idempotency, and replay Work with the rule and parameter repository and cumulative-limit state in PostgreSQL (Aurora), together with data engineers Write clean, testable domain code with thorough automated tests of rule behavior Build services that handle high, bursty volume (over 1M checks per day) Support parallel runs and parity checks against the legacy system Instrument services with metrics, tracing, and structured logs, and work with DevOps on deployment to AWS ##### Skills Must have 5+ years of commercial backend development in Java, with hands-on use of Java 17+ features (records, sealed interfaces, pattern matching, switch expressions) Strong domain modeling skills, keeping business logic clean, testable, and separate from infrastructure (DDD / hexagonal architecture) Expert knowledge of java.time: Instant vs. ZonedDateTime vs. LocalDateTime Time zones and DST transitions Duration and Period arithmetic Interval and rolling-window calculations Proven experience implementing complex business rules directly in code (not by configuring a commercial BRMS such as IBM ODM, FICO Blaze, or Pega):



Parameterized and effective-dated rules An auditable explanation or trace for every result Production experience with Apache Kafka: Producers and consumers, consumer groups Partitioning and keys for ordering Offset management and replay Idempotent processing and delivery semantics Solid SQL and relational database experience, preferably PostgreSQL (schema design, transactions, query optimization) Testing: JUnit 5 and parameterized tests Testing time-dependent logic deterministically, e.g., with an injectable Clock Git, code review practices, and working with CI pipelines Ability to work independently with a robust problem-solving mindset Nice to have Temporal and versioned data modeling in PostgreSQL/Aurora: effective-date ranges (range types, exclusion constraints), bitemporal models Running Java services on AWS: ECS Fargate, Lambda, API Gateway, plus working knowledge of IAM, Secrets Manager, and KMS DynamoDB, and ElastiCache (Redis/Valkey) for caching Observability: Micrometer and/or OpenTelemetry, distributed tracing, structured logging, latency percentiles (p95/p99) High-volume, low-latency services: bursty load, back-pressure, concurrency, JVM performance tuning Embedded expression languages and runtime configuration (changing rule parameters without redeployment) Familiarity with S3, Athena, Glue, or Firehose for reporting pipelines Legacy system replacement: parallel runs, parity and accuracy validation Domain experience in crew or workforce scheduling, or in duty and rest time compliance ##### Other Languages English: B2 Upper Intermediate Seniority Senior Remote India, India Req. VR-125535 Java Cross Industry Solutions 02/11/2026 Req. VR-125535

📌 Senior Java developer (India)
🏢 Luxoft
📍 India