Java Backend Developer Intern

**About LazyCy** At LazyCy, we are building an advanced advertising platform leveraging Amazon Advertising to empower brands and sellers to launch effective campaigns, scale their reach, and boost sales on Amazon. Our platform seamlessly combines Amazon Advertising, shopper behavior data, and AI-powered optimization tools, helping businesses target the right customers with smart, efficient budget strategies. With Retail Media and Amazon Advertising ranking among the fastest-growing ad markets globally, we are scaling our team to deliver this impactful solution to more businesses worldwide. The Role As a Java Developer Intern, you will join the Tech team and work closely with Senior Developers and the Tech Lead on real Backend systems of our enterprise SaaS platform. You will receive hands-on training and mentoring while building and maintaining Backend services with Java and Spring Boot. This role is ideal for those who want to build a career as a Java Backend Developer. What You Will Do * Develop and support to maintain Backend systems using Java and Spring Boot. * Build RESTful APIs for web applications and internal services. * Work with PostgreSQL and MongoDB: design queries, perform CRUD operations, and process and optimize data at a basic level. * Debug, fix bugs and resolve issues that arise during development. * Write unit tests for assigned modules and APIs. * Use Git following the team's workflow. * Read and analyze technical requirements under the guidance of Senior Developers and the Tech Lead. * Participate in code reviews, receive feedback and improve code quality. * Learn and apply software engineering best practices. * Research new technologies when required by the project. What We’re Looking For **You Might Be a Great Fit If You** * Final-year students or recent graduates majoring in Computer Science, Software Engineering or Information Technology. Candidates who are available to work full-time are preferred. * Basic knowledge of Java Core: OOP, Collections, Exception Handling, Interfaces/Abstract Classes and Generics. Familiarity with the Java Stream API is an advantage. * Basic knowledge of Spring Boot and REST APIs. * Understanding of HTTP methods such as GET, POST, PUT and DELETE. * Basic knowledge of SQL and relational databases. * Familiarity with Git. * Ability to read and understand technical documentation in English. **Mindset & Qualities** * Logical thinker: Strong logical thinking and problem-solving skills. * Proactive learner: Takes initiative in learning and exploring new technologies. * Self-researcher: Able to read documentation and research problems independently. * Team player: Able to work well in a team. * Open to feedback: Ready to receive feedback and improve. **Benefits** Benefits: * Internship allowance: VND 3–5 million/month. * Parking allowance: Parking support provided during the internship. * Career opportunity: Strong-performing interns may have the opportunity to transition into a full-time position and build a long-term career with LazyCy. * Learning & development: Hands-on experience, on-the-job learning and exposure to real projects in international E-commerce. **What You’ll Gain** * Hands-on experience with a real SaaS & AdTech product serving international E-commerce markets. * Build practical skills in Requirement Analysis, User Stories, Business Flows, System Flows and Product Testing. * Learn how Amazon Ads, AI and automation are applied to solve real business and product problems. * Work closely with experienced BA, Product, Designer, Developer and QA teams and learn how cross-functional teams build products together. * Develop a strong foundation for a career as an IT Business Analyst, Product Analyst or AI/Automation Product BA. Why Join LazyCy? * A Fast-Growing Market: Retail Media and Amazon Advertising represent one of the fastest-growing advertising sectors globally. At LazyCy, we embrace and nurture bold, innovative ideas and breakthrough approaches. Driven by an Agile workflow, you will have the flexibility to collaborate across diverse squads, new projects, and cutting-edge products beyond traditional corporate structures. * High-Impact Ownership: You will be at the forefront of building the market for a pioneering ad-tech platform. Your contributions will directly drive revenue growth and shape the company's trajectory. * Vibrant Startup Environment: Work in a young, dynamic, and high-energy environment built on a foundation of core values: Efficiency & High Performance, Creativity & Innovation, Customer-Centricity, Human-Centricity / Humanity. How To Apply **Candidates Who Are Interested In This Position, Please** * Send your CV to: [email protected] Email Subject Line: [LazyCy] Java Backend Developer Intern - [Candidate's Full Name] * Or, fill in the application form below