Senior Backend Developer (Java / Spring / AWS)

Quest Global; Chennai District; On-site; INR 1,200,000 - 2,000,000; Full time

Job summary

Quest Global in Chennai is seeking a highly skilled Java backend engineer to design and develop systems using Java 17+, Spring Boot, WebFlux and reactive patterns.

You will work across data, cloud and APIs, ensuring robust, scalable solutions with strong testing, CI/CD and security practices.

Candidates should excel in distributed systems, debugging, and collaborating with cross‑functional teams to deliver reliable software end‑to‑end.

Qualifications

• Proficient in Java 17+ and modern language features.
• Strong Spring Boot experience including WebFlux and security.
• Experience with reactive data access and test frameworks.

Responsibilities

• Design and implement backend systems using Java 17+ and Spring Boot.
• Develop reactive services with Project Reactor.
• Collaborate across data, cloud, APIs, and CI/CD to deliver robust software.

Skills

Java 17+

Spring Boot

Reactive programming

Project Reactor

Gradle

JUnit 5

Docker

Git & CI/CD

Tools

Lombok

Jackson

OpenAPI 3

PostgreSQL

Job description

Role & responsibilities

Core Java & Frameworks

• Java 17+ (we run the latest LTS) records, sealed types, streams and modern language features.
• Spring Boot in depth, including WebFlux and Spring Security (OAuth2 Resource Server).
• Project Reactor `Mono`/`Flux` composition, error operators, backpressure and retries; no `.block()`, `Thread.sleep()` or blocking SDKs.
• Gradle multi-module builds, Lombok, Jackson.

Data

• PostgreSQL at a professional level — schema design, indexing and query plans.
• R2DBC or equivalent reactive data access, and jOOQ or comparable type-safe SQL tooling.
• Flyway or Liquibase migrations validated in CI.

Cloud & Messaging

• Hands-on AWS — Lambda, SQS (FIFO semantics, visibility timeouts, DLQs), EventBridge, S3, Secrets Manager, ECS Fargate, RDS/Aurora, CloudWatch, IAM.
• AWS SDK v2 async clients or Spring Cloud AWS.
• Infrastructure as Code — CloudFormation, or SAM/CDK/Terraform with willingness to work in CloudFormation.

APIs & Contracts

• OpenAPI 3, REST conventions, versioning, consistent error contracts and bean validation.

Quality & Delivery

• JUnit 5, Mockito, Spring Boot Test, Reactor Test — meaningful tests for both success and failure paths.
• Docker and Compose for local development.
• Git, pull-request workflow and GitHub Actions or equivalent CI/CD.
• SonarQube or similar static analysis, with coverage discipline.

Engineering Judgment

• Distributed-systems fluency — idempotency, at-least-once delivery, retries, timeouts, partial failure and eventual consistency.
• Strong analytical, debugging and communication skills; owns delivery end-to-end.

Preferred candidate profile

• OpenTelemetry / distributed tracing; Grafana, Tempo, Prometheus or Loki.
• Snowflake or another cloud data warehouse; large-scale ingestion pipelines.
• Spring Cloud Function on Lambda, and JVM cold-start tuning (CRaC, SnapStart, fat JARs).
• LocalStack for local AWS emulation.
• Serverless cost/performance tuning and JVM tuning for containers.
• Enterprise SSO (Azure Entra, OAuth2 introspection) and centralized entitlement/RBAC services.
• OWASP Top 10 awareness and secure code review.
• Agile/Scrum delivery and trunk-friendly branching.