Senior Backend Engineer - Java / Spring Boot APIs (KLI-102)

KitaLulus; Jakarta Pusat; On-site; IDR 420,000,000 - 900,000,000; Full time

Job summary

KitaLulus is seeking a senior backend engineer in Jakarta to design, build, and maintain RESTful APIs powering a multi-tenant SaaS platform. You will own the data layer end to end with MySQL, SQL Server, and PostgreSQL, and you will harden tenant isolation and security while shipping robust, scalable services.

You will refactor legacy services into well-bounded components, write tests and reviews, document API contracts with OpenAPI, and collaborate with front-end developers working in

Qualifications

• 5+ years backend development in Java with Spring Boot (Spring MVC, Spring Data JPA, Spring Security).
• Experience designing RESTful APIs for business apps: contracts, versioning, validation, pagination, error semantics.
• Relational DB design and optimization; JPA/Hibernate mappings; native SQL across MySQL, SQL Server, PostgreSQL.
• Frontend knowledge: TypeScript to read/debug API usage; ability to make small UI changes.
• Experience with large, mature codebases; decomposing services, adding tests, untangling dependencies.
• Strong API security practices: multi-tenant isolation, authentication, authorization, input validation, secrets handling.

Responsibilities

• Design, build, and maintain RESTful APIs in Java / Spring Boot that power a multi-tenant SaaS platform: endpoints, validation, pagination/sorting/filtering, reporting and dashboard data, audit trails.
• Own the data layer end to end: JPA entities, DAOs and repositories, native queries, views, and stored procedures across MySQL, SQL Server, and PostgreSQL. Design schemas and tune slow queries.
• Harden tenant isolation, authentication, and authorization so every request sees only the data it is entitled to.
• Refactor and decompose large legacy services into well-bounded, testable components without disrupting production.
• Write unit and integration tests, and raise the bar on coverage, structured logging, and error handling.
• Define and document API contracts (OpenAPI/Swagger) and work with front-end engineers (TypeScript) to keep them in sync.
• Give and receive thorough code reviews, and use AI coding assistants as part of the daily workflow while reviewing their output with the same rigor as any other contributor's.
• Ship through a Bitbucket pull-request and Jira ticket workflow to AWS (ECS), and help resolve production issues.

Skills

Java / Spring Boot

RESTful APIs design

SQL & DB design

Testing & CI

TypeScript familiarity

Code reviews

Tools

MySQL

SQL Server

PostgreSQL

OpenAPI/Swagger

Bitbucket

Jira

AWS ECS

Job description

• Design, build, and maintain RESTful APIs in Java / Spring Boot that power a multi-tenant SaaS platform: endpoints, validation, pagination/sorting/filtering, reporting and dashboard data, audit trails.
• Own the data layer end to end: JPA entities, DAOs and repositories, native queries, views, and stored procedures across MySQL, SQL Server, and PostgreSQL. Design schemas and tune slow queries.
• Harden tenant isolation, authentication, and authorization so every request sees only the data it is entitled to.
• Refactor and decompose large legacy services into well-bounded, testable components without disrupting production.
• Write unit and integration tests, and raise the bar on coverage, structured logging, and error handling.
• Define and document API contracts (OpenAPI/Swagger) and work with front-end engineers (TypeScript) to keep them in sync.
• Give and receive thorough code reviews, and use AI coding assistants as part of the daily workflow while reviewing their output with the same rigor as any other contributor's.
• Ship through a Bitbucket pull-request and Jira ticket workflow to AWS (ECS), and help resolve production issues.

Responsibilities

• Design, build, and maintain RESTful APIs in Java / Spring Boot that power a multi-tenant SaaS platform: endpoints, validation, pagination/sorting/filtering, reporting and dashboard data, audit trails.
• Own the data layer end to end: JPA entities, DAOs and repositories, native queries, views, and stored procedures across MySQL, SQL Server, and PostgreSQL. Design schemas and tune slow queries.
• Harden tenant isolation, authentication, and authorization so every request sees only the data it is entitled to.
• Refactor and decompose large legacy services into well-bounded, testable components without disrupting production.
• Write unit and integration tests, and raise the bar on coverage, structured logging, and error handling.
• Define and document API contracts (OpenAPI/Swagger) and work with front-end engineers (TypeScript) to keep them in sync.
• Give and receive thorough code reviews, and use AI coding assistants as part of the daily workflow while reviewing their output with the same rigor as any other contributor's.
• Ship through a Bitbucket pull-request and Jira ticket workflow to AWS (ECS), and help resolve production issues.

Qualifications

• 5+ years of professional backend development in Java, with deep hands-on Spring Boot experience (Spring MVC, Spring Data JPA, Spring Security).
• A track record of designing and building RESTful APIs for business applications: contracts, versioning, validation, pagination, error semantics.
• Strong relational database skills: schema design, JPA/Hibernate mappings, native SQL, query optimization. Hands-on with more than one of MySQL, SQL Server, PostgreSQL.
• Working knowledge of TypeScript: enough to read a front-end codebase, debug API consumption, and make small changes.
• Experience working in and improving large, mature codebases: breaking up oversized services, adding tests, untangling dependencies.
• Solid grasp of API security: authentication and authorization, multi-tenancy, input validation, secrets handling.