Senior Java developer

Job Summary

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; separation 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

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

Location - Pune,Mumbai,Chennai,Banagalore

Role: Full Stack Developer,

Industry Type: Legal,

Department: Engineering - Software & QA,

Employment Type: Full Time, Permanent

Role Category: Software Development

Education

UG: Any Graduate

PG: Any Postgraduate

Key Skills

Skills highlighted with ‘‘ are preferred keyskills airline apacheapache kafkaapi gatewayarchitectureauroraawsbackend developmentbusiness systemscachingcode reviewcomplianceconcurrencydata modelingdeploymentdevopsdistributed tracingembeddedfargatefico blazegit