Java Software Engineer

Company: AiHello

Location: Remote (India)

Experience: 3-8 Years

Employment Type: Full-time

About AiHello

AiHello is a fast-moving e-commerce SaaS platform that automates and optimizes operations for sellers across multiple marketplaces. We handle heavy data synchronization, complex advertising automation, and high-concurrency integrations.

What You Will Work On

You will work on a large Java and Spring Boot backend that powers marketplace and advertising automation across Amazon and other commerce platforms. The role includes:

• Building and maintaining backend services in Java 23 or above and Spring Boot
• Designing, debugging, and improving many REST application programming interface endpoints
• Handling high-concurrency http calls to third-party services
• Integrating with Amazon Selling Partner Application Programming Interface, Amazon advertising application programming interfaces, Walmart, Shopify, WooCommerce, Stripe, PayPal, and Amazon Web Services services such as Simple Queue Service
• Building reliable asynchronous workflows, scheduled jobs, and data synchronization pipelines
• Processing large volumes of JSON payloads and marketplace report data
• Tuning Structured Query Language queries and improving MariaDB performance
• Working on security, authentication, authorization, and token-based access using Java Web Token and Spring Security
• Supporting production systems using containers, logs, metrics, tracing, and code quality tooling

What We Need From You

We are looking for a backend engineer who is confident working independently in a complex production codebase.

Must-have skills

• 3 to 8 years of backend development experience in Java
• Strong hands-on experience with Java 23 or above
• Strong experience with Spring Boot
• Good understanding of Java Persistence Application Programming Interface, Hibernate, and relational database design
• Strong experience with MySQL or MariaDB
• Good Structured Query Language skills, including query tuning and performance analysis
• Experience handling complex JSON request and response payloads
• Experience building or supporting systems with high concurrency and heavy third-party application programming interface traffic
• Strong debugging and root-cause analysis skills
• Ability to read, understand, and improve large existing codebases
• Experience with Gradle
• Experience with Docker and Docker Compose
• Experience with Spring Security and Java Web Token based authentication
• Ability to analyze problems independently and drive solutions to completion
• Strong written and spoken English for technical communication

Strongly preferred

• Experience with Amazon Selling Partner Application Programming Interface
• Experience with Amazon advertising application programming interfaces
• Experience with e-commerce or marketplace software
• Experience with asynchronous workflows, queues, retries, rate limiting, and fault-tolerant integrations
• Experience with Amazon Web Services services such as Simple Queue Service
• Experience with observability tools such as OpenTelemetry, Prometheus, and Sonar
• Experience debugging performance bottlenecks in Java applications
• Experience working with scheduled jobs, batch processing, and integration-heavy backends
• Familiarity with Node-based repository tooling where needed
• Experience writing or maintaining good application programming interface documentation

Nice to have

• Experience with Walmart, Shopify, WooCommerce, Stripe, or PayPal integrations
• Experience in JHipster-based applications
• Familiarity with distributed tracing and production monitoring
• Experience in software-as-a-service products serving small and medium-sized businesses
• Exposure to containerized deployment and operational automation

What Success Looks Like

In this role, you should be able to:

• Understand a complicated business flow and trace it across controllers, services, repositories, scheduled tasks, and integrations
• Debug a broken production workflow and identify the real issue instead of guessing
• Improve slow endpoints, poor queries, unstable jobs, and unreliable integrations
• Build clean backend features that fit into an existing monolith without creating chaos
• Work with minimal supervision and still communicate clearly on blockers, tradeoffs, and risks
• Take ownership of code quality, performance, and reliability

Who Will Do Well Here

This role is a strong fit for someone who:

• Thinks like a backend engineer, not just a ticket closer
• Is comfortable reading older code and improving it safely
• Can work through messy real-world business logic
• Does not panic when dealing with logs, stack traces, retries, race conditions, and production bugs
• Enjoys integration-heavy systems and data-heavy workloads
• Can balance speed with correctness

Work Style

We want someone who is dependable, practical, and self-driven. You should be comfortable investigating issues on your own, proposing clean fixes, and shipping production-ready code. We value engineers who can think clearly, ask smart questions, and improve the system instead of just patching symptoms.

Example Responsibilities in the First Few Months

• Take ownership of selected backend modules related to marketplace sync and advertising workflows
• Improve reliability of scheduled tasks and external platform integrations
• Optimize slow database queries and identify performance bottlenecks
• Build and maintain application programming interface endpoints used by internal and customer-facing systems
• Strengthen logging, metrics, tracing, and production diagnostics
• Reduce technical debt in legacy flows while keeping the platform stable

Interview Focus

Candidates will be evaluated on:

• Real Java and Spring Boot experience
• Debugging ability
• Structured Query Language and database reasoning
• Concurrency and integration handling
• Code quality and maintainability thinking
• Ability to work independently in a large backend system

Please read this job description and let us know in the cover letter why you are an ideal candidate.