Java Back End Developer

Employment Type: Full-Time

About the Role

We are looking for a highly skilled Senior Backend Developer to join our engineering team and contribute to the development of a large-scale, cloud-native Dynamic Service Options (DSO) Platform. The role involves building reactive microservices, event-driven workflows, and scalable APIs using modern Java, Spring Boot WebFlux, PostgreSQL, and AWS technologies.

You will work on mission-critical systems responsible for high-volume data ingestion, dataset generation, entitlement management, and API delivery while ensuring performance, reliability, security, and observability across distributed cloud applications.

Key Responsibilities

Backend Development

• Design, develop, and maintain high-performance reactive REST APIs using Java 17+, Spring Boot, Reactive Spring, AWS and WebFlux.
• Build fully asynchronous workflows using Project Reactor (Mono/Flux).
• Develop scalable microservices following cloud-native architecture principles.
• Implement secure APIs with OAuth2 Resource Server and role-based access controls.

Event-Driven Systems

• Develop event-driven solutions using AWS Lambda, SQS FIFO, and EventBridge.
• Design resilient message-processing workflows with retries, dead-letter queues, and idempotent processing.
• Build background processing jobs with concurrency controls and observability.

Database & Data Engineering

• Design and optimize PostgreSQL schemas and queries.
• Work with Spring Data R2DBC and jOOQ for reactive and type-safe database interactions.
• Implement database versioning and migrations using Flyway.
• Utilize PostgreSQL features including JSONB, partitioning, indexing, and hierarchical data structures.

Cloud & DevOps

• Deploy and manage applications on AWS using:
• ECS Fargate
• Lambda
• SQS
• Aurora PostgreSQL
• S3
• Secrets Manager
• DynamoDB
• CloudWatch
• Create and maintain Infrastructure as Code using CloudFormation.
• Contribute to CI/CD pipelines using GitHub Actions, Docker, and AWS deployment services.

Observability & Quality

• Implement distributed tracing using OpenTelemetry and AWS ADOT.
• Create meaningful dashboards and monitoring solutions using CloudWatch, X-Ray, and Grafana.
• Write comprehensive unit and integration tests using:
• JUnit 5
• Mockito
• Reactor Test
• Spring Boot Test
• Ensure high code quality through SonarQube and code review practices.

Required Skills

Core Technologies

• Java 17+ with strong understanding of modern Java features.
• Spring Boot and Spring WebFlux.
• Project Reactor (Mono/Flux, backpressure, error handling, retries).
• Spring Security and OAuth2.

Database

• PostgreSQL database design and performance tuning.
• Reactive database programming with R2DBC.
• jOOQ or similar type-safe query frameworks.
• Flyway or Liquibase migrations.

AWS & Messaging

• AWS Lambda
• SQS (FIFO, DLQ, visibility timeout handling)
• EventBridge
• ECS Fargate
• S3
• Secrets Manager
• IAM
• Aurora PostgreSQL

DevOps & CI/CD

• Docker & Docker Compose
• Git, GitHub Actions
• CloudFormation (or Terraform/CDK with willingness to work on CloudFormation)
• SonarQube

Desired Experience

• 6+ years of backend development experience.
• 3+ years of experience building cloud-native applications on AWS.
• Strong understanding of distributed systems concepts:
• Event-driven architecture
• Idempotency
• Eventual consistency
• Retry strategies
• Fault tolerance
• Experience working in Agile/Scrum environments.

Preferred Skills

• OpenTelemetry, Grafana, Prometheus, Tempo, Loki.
• Snowflake or other cloud data warehouse integrations.
• Spring Cloud Function.
• LocalStack.
• Serverless performance optimization.
• Azure Entra ID / Enterprise SSO integrations.
• OWASP Top 10 and secure coding practices.

What You'll Build

• High-volume data ingestion and processing pipelines.
• Reactive microservices and API platforms.
• Dataset generation and delivery workflows.
• Event-driven publish/consume architectures.
• Organization and user-level access control systems.
• Third-party integrations and orchestration services.
• Scalable cloud-native backend platforms running on AWS.

Keywords: Java, Spring Boot, WebFlux, Project Reactor, AWS Lambda, SQS, EventBridge, ECS Fargate, PostgreSQL, R2DBC, jOOQ, Flyway, OpenTelemetry, Docker, GitHub Actions, CloudFormation, Microservices, Reactive Programming, Distributed Systems.