Senior Java Software Engineer

Key Responsibilities

• Design, develop, and maintain scalable microservices using Java and Spring Boot.
• Build and expose RESTful APIs with clean contracts, proper error handling, and thorough documentation.
• Design and manage data models across PostgreSQL and MongoDB, ensuring efficient querying and schema integrity.
• Implement and manage event-driven workflows using Apache Kafka for reliable, asynchronous communication between services.
• Write production-grade code with strong multithreading and concurrency management thread pools, locks, async patterns.
• Develop comprehensive unit and integration tests using JUnit, Mockito, or equivalent frameworks.
• Participate in code reviews and contribute to engineering best practices and architecture decisions.
• Identify and resolve performance bottlenecks across services, databases, and message pipelines.
• Collaborate with cross-functional teams including product, DevOps, and QA to ship quality features reliably.

MANDATORY SKILLS
Technical

• Java (4+ years): Strong hands-on experience with Java 11/17, object-oriented design, collections, streams, exception handling, JVM fundamentals, design patterns, and writing maintainable production-grade code.
• Spring Boot: Strong experience building production-grade microservices using Spring Boot, Spring Data JPA, Spring Validation, Spring Actuator, and configuration management.
• Spring Security: Awareness of JWT-based authentication, OAuth2 flows, and API security patterns.
• Microservices Architecture: Solid understanding of service decomposition, inter-service communication, and distributed system patterns.
• System Design: Ability to design scalable backend systems with considerations for resiliency, scalability, caching, and fault tolerance.
• Apache Kafka: Experience designing asynchronous event-driven architectures using Kafka, including retries, dead-letter queues (DLQ), idempotency, consumer scaling, partitioning, and message ordering.
• PostgreSQL: Strong understanding of relational database design, normalization, indexing, transactions, query optimization, and execution plans.
• MongoDB: Practical experience with document modeling, aggregations, and NoSQL data access patterns.
• Multithreading & Concurrency: Strong understanding of Java concurrency, thread pools, synchronization, locks, CompletableFuture, concurrent collections, and performance implications in high-throughput applications.
• APIs: REST API design, pagination, filtering, versioning, idempotency, authentication, rate limiting, and API documentation using OpenAPI/Swagger.
• Unit Testing: Experience writing unit, integration, and API tests using JUnit, Mockito, Spring Boot Test, and MockMvc.

GOOD-TO-HAVE SKILLS
These will set you apart

• "BPM & Workflow Engines: Hands-on experience with any BPMN-based workflow engine (e.g., Camunda, Flowable, or equivalent) designing workflows, integrating service tasks, and managing process instances."
• Docker & Kubernetes: Familiarity with containerizing services and deploying to orchestrated environments.
• CI/CD Pipelines: Experience with Jenkins, GitHub Actions, or similar tools for automated build and deployment.
• AI/ML Integration: Experience integrating external AI/LLM services (OpenAI, Anthropic, Gemini, Azure OpenAI, etc.) into backend applications through REST APIs or SDKs.
• Cloud Platforms: Basic familiarity with AWS, GCP, or Azure for deployment, managed databases, or messaging services.

WHO YOU ARE

• Backend-focused, detail-oriented you take pride in clean code, efficient data access, and reliable service design.
• Ownership-oriented: You take problems from ambiguity to solution independently.
• Startup-ready: You are comfortable with changing priorities, lean teams, and high-impact work.
• A strong communicator who can align with cross-functional teammates quickly.