APPLICATION ENGINEER (FULL-STACK & AI SYSTEMS)

PT. LOTTE INNOVATE INDONESIA; Cilegon; On-site; IDR 180,000,000 - 360,000,000; Full time

Job summary

PT. LOTTE INNOVATE INDONESIA is seeking an Applications Engineer to design, develop, and maintain full‑stack internal applications across backend and frontend, using Java, C#, Python and React. You will build REST APIs and connect data sources in on‑premise Windows/Linux environments.

Hands‑on AI/LLM experience (RAG, MCP, ML models) and collaboration with business users to deliver end‑to‑end solutions, troubleshoot production issues, and thrive in a fast‑paced manufacturing setting are essential.

Qualifications

• Strong experience in software development.
• Proficiency in Java or C#, with hands-on Python experience.
• Hands-on experience with AI/LLM technologies (RAG, LLM integration, MCP, ML models) and OpenAI/Anthropic/Ollama APIs.
• Experience with Git, REST APIs, SQL databases, debugging, and production troubleshooting.
• Frontend development using React or similar frameworks is a plus.

Responsibilities

• Design, develop, and maintain full-stack internal applications across backend and frontend systems.
• Develop backend services using Java, C#, and Python; build and integrate REST APIs.
• Deploy and operate applications in on-premise Windows/Linux environments; troubleshoot issues.
• Collaborate with business users to deliver end-to-end solutions in manufacturing contexts.

Job description

Design, develop, and maintain full-stack internal applications across backend and frontend systems.

Develop backend services using Java, C#, and Python.

Develop frontend features using React or similar frameworks.

Build and integrate REST APIs for internal systems and dashboards.

Implement AI features including RAG, LLM integration, MCP, and Machine Learning models for prediction and anomaly detection.

Deploy and maintain applications in on-premise Windows/Linux environments.

Work with multiple data sources, including SQL Server, RTDB, Excel, and PDF.

Troubleshoot production issues across frontend, backend, database, and infrastructure layers.

Collaborate directly with business users to develop operational systems and deliver end-to-end solutions.

Requirements

Strong experience in software development, preferably backend or full-stack development.

Proficiency in at least Java or C#, with hands‑on experience using Python.

Hands‑on experience with AI/LLM technologies, including at least one of RAG, LLM integration, MCP, or Machine Learning models.

Experience using OpenAI, Anthropic, Ollama, or similar LLM APIs.

Proficiency in Git, including branching, merging, and collaboration workflows.

Solid understanding of REST APIs, SQL databases, debugging, and production troubleshooting.

Experience with frontend development using React or similar frameworks is a plus.

Comfortable working in on-premise environments.

Able to deploy and operate applications without dedicated DevOps support.

Strong problem‑solving skills and ability to work in a fast‑paced and evolving environment.

Willing to learn and understand manufacturing, petrochemical, and industrial business processes.

PT. Lotte Data Communication Indonesia (LDCI) are subsidiary companies of Lotte Data Communication Company (LDCC), which is also a part of Lotte Group the multinational conglomerate corporation, and one of the Top Five biggest groups with diverse businesses in South Korea.

Specialized in handling IT Service Provider, We lead business innovation for our customers by providing differentiated IT platforms and services for all industries, including Food, Retail, Hospitality, Manufacturing, Logistic, Financial Service, and Chemicals. We are actively engaged in business such as Solutions, IT Outsourcing, and Data Center Business.

PT. Lotte Data Communication Indonesia (LDCI) are subsidiary companies of Lotte Data Communication Company (LDCC), which is also a part of Lotte Group the multinational conglomerate corporation, and one of the Top Five biggest groups with diverse businesses in South Korea.

Specialized in handling IT Service Provider, We lead business innovation for our customers by providing differentiated IT platforms and services for all industries, including Food, Retail, Hospitality, Manufacturing, Logistic, Financial Service, and Chemicals. We are actively engaged in business such as Solutions, IT Outsourcing, and Data Center Business.

What can I earn as an Applications Engineer