GenAI Engineer

ArcFusion; Jakarta Pusat; On-site; IDR 300,000,000 - 600,000,000; Full time

Job summary

ArcFusion in Jakarta is expanding its GenAI-enabled product team. You will design, build, and maintain software with integrated generative AI, delivering APIs, databases, tests, and production deployments.

You’ll own the UI for enterprise users and prototype concepts using AI-assisted tools to prove feasibility before full builds. We seek engineers with strong Python, LLM experience, frontend craft, and solid product judgment.

Qualifications

• Minimum 5 years building production-ready software with ML or data engineering exposure.
• Strong Python skills; proficiency in other modern languages is a plus.
• Hands-on experience with LLMs, prompt engineering, and related tools.
• Frontend capability with attention to craft and UI details.
• Product judgment to decide what should be built and what can wait.
• Clear communication to technical and non-technical audiences.

Responsibilities

• Design, implement, and maintain scalable AI-enabled systems with performance and cost targets.
• Develop production backend services and APIs powering AI applications.
• Build user-facing interfaces that are clear and pleasant to use.
• Decide feature scope and prioritization based on user needs and constraints.
• Implement comprehensive testing and monitoring for AI components.
• Prototype quickly using AI-assisted development tools to validate ideas.

Skills

Python

Frontend development

LLM experience

Communication

Product judgment

Tools

LangChain

LangGraph

React

Job description

Come grow with us at the frontier of GenAI.

ArcFusion is expanding rapidly, with engineering teams in Bangkok and Jakarta. We’re looking for experienced engineers with a strong understanding of software, data and ML engineering, alongside frontend and product design, to join our Jakarta team at our SCBD office. You’ll help deliver some of the most exciting enterprise GenAI projects in the region.

The Role

You’ll design, develop, and maintain software systems with integrated generative AI: building APIs, designing databases, writing comprehensive tests, deploying to production, and supporting what you ship. GenAI is your specialization, not your whole job.

You own the product end to end, interface included.

You’ll build the UI that enterprise users actually touch, often without a designer beside you. We want someone who notices when spacing is inconsistent, who has a view on what to cut, and who can take a half-formed brief and come back with something that works and looks considered.

We also move fast with ideas. We use GenAI coding tools to prototype and validate concepts, and we’re looking for engineers comfortable doing the same: turning an idea into a working proof of concept before investing in a full build.

What You’ll Do

• Design, implement, and maintain scalable, robust generative AI systems that meet performance, cost, and latency requirements
• Build and maintain the production backend services and APIs that power AI-driven applications
• Build the user-facing side of those applications, creating interfaces that are clear, consistent, and genuinely pleasant to use
• Make product calls: decide what's worth building, what to cut, and what the user actually needs
• Implement comprehensive testing strategies (unit, integration, and end-to-end), including evaluation frameworks and monitoring for AI systems
• Rapidly prototype and build proofs of concept using AI-assisted development tools to validate ideas, demonstrate feasibility, and iterate quickly
• Participate in code and design reviews, and contribute to engineering best practices for production AI systems
• Identify potential applications of generative AI for clients and advise on their implementation

What We’re Looking For

• Minimum 5 years building production-ready software, with exposure to ML or data engineering
• Strong Python. Other modern languages are a plus
• Hands-on LLM experience, including prompt engineering, RAG architectures, and agentic workflows using frameworks like LangChain or LangGraph
• Real frontend ability and an eye for craft. React or similar, plus genuine care about spacing, alignment, typography, colour, and consistency. You can make an interface look considered without a designer holding your hand
• Product judgment. You can look at a vague requirement and work out what should actually get built, and say so
• Clear communication. You can explain both technical and design decisions to technical and non-technical audiences, and you take critique well on both

Nice to Have

• Familiarity with vector databases (Pinecone, Weaviate, Qdrant, pgvector) or other NoSQL technologies
• Experience on a cloud platform such as Azure, AWS, or GCP
• Experience with design systems or component libraries (Tailwind, shadcn/ui), or fluency reading Figma

What We Value

We believe the best solutions come from open collaboration. We're looking for engineers who don't just execute tasks, but actively contribute ideas, challenge assumptions, and speak up when they see a better approach, including when the better approach is "this isn't good enough yet." If you thrive in an environment where your voice matters and continuous improvement is the norm, you'll fit right in.

We value strong engineering fundamentals, the ability to learn quickly and a commitment to building reliable systems.