Founding AI R&D Engineer — AI Infrastructure & Model Routing

A-Field Tech; Hong Kong; Hybrid; HKD 800,000 - 1,200,000; Full time

Benefits offered by this job

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Job summary

A-Field Tech Limited in Hong Kong is building the next layer of AI infrastructure, focusing on intelligent routing, model evaluation, and reliable developer tooling for a live platform.

You will work on applied AI research and software engineering to ship production features, with opportunities to own components and influence architectural decisions.

Join a founding team in a fast-growing company and help shape regional AI capabilities across Asia.

Qualifications

• Experience with applied research, experimentation, data analysis, AI systems, or complex technical products.
• Familiarity with Python, TypeScript, JavaScript, Go, or a similar language.
• Understanding of APIs, databases, asynchronous systems, cloud infrastructure, or distributed services.
• Ability to turn an unclear problem into a hypothesis, experiment, measurable result, and practical implementation.
• Strong analytical thinking and attention to reliability and reproducibility.
• Curiosity about large language models, model evaluation, routing, and AI infrastructure.
• Ownership mindset and comfort working in an early-stage company.

Responsibilities

• Research and prototype intelligent model-routing strategies
• Build evaluation and benchmarking tools for quality, cost, latency, and reliability
• Develop fallback, retry, caching, observability, and quota-management systems
• Investigate how prompts and task requirements can be matched to suitable models
• Build experiments, simulations, datasets, and reproducible test harnesses
• Integrate new model providers and standardise different APIs and capabilities
• Turn validated research into reliable production features
• Document findings, limitations, and technical recommendations clearly

Skills

Software engineering

Applied research

Data analysis

Python

TypeScript

JavaScript

Go

APIs

Databases

Distributed systems

Education

Bachelor's degree in CS

Job description

Location: Hong Kong / flexible hybrid arrangement

Company: A-Field Tech Limited

Type: Founding-team, full-time role

Help build the intelligence layer for AI infrastructure in Asia

A-Field Tech Limited is a Hong Kong-based AI and network infrastructure company. We are building a stable regional AI gateway (www.nexllm.ai) to leading AI models. Our live platform gives developers one interface for accessing 51 models across Claude, OpenAI, Gemini, Qwen, DeepSeek, and other providers. We are now developing the next layer: intelligent routing, model evaluation, reliability tooling, and developer infrastructure that helps applications choose and operate the right model for each task.

What You Will Work On

• Research and prototype intelligent model-routing strategies
• Build evaluation and benchmarking tools for quality, cost, latency, and reliability
• Develop fallback, retry, caching, observability, and quota-management systems
• Investigate how prompts and task requirements can be matched to suitable models
• Build experiments, simulations, datasets, and reproducible test harnesses
• Integrate new model providers and standardise different APIs and capabilities
• Turn validated research into reliable production features
• Document findings, limitations, and technical recommendations clearly

The role combines applied AI research, software engineering, distributed systems, and product development. You will work on real technical problems affecting a live platform, not a purely theoretical research project.

What We Are Looking For

• Strong software engineering fundamentals
• Experience with applied research, experimentation, data analysis, AI systems, or complex technical products
• Familiarity with Python, TypeScript, JavaScript, Go, or a similar language
• Understanding of APIs, databases, asynchronous systems, cloud infrastructure, or distributed services
• Ability to turn an unclear problem into a hypothesis, experiment, measurable result, and practical implementation
• Strong analytical thinking and attention to reliability and reproducibility
• Curiosity about large language models, model evaluation, routing, and AI infrastructure
• Ownership mindset and comfort working in an early-stage company

A degree in computer science, AI, machine learning, software engineering, data science, or a related field is helpful. Strong projects, research experience, publications, open-source work, or equivalent practical experience are also welcome. You do not need prior experience building an AI gateway. We care about your ability to learn unfamiliar systems, investigate difficult questions, and build useful solutions.

Why join A-Field Tech/NexLLM

• Join while the core R&D direction is still being shaped
• Work directly with the founder and have visible technical ownership
• Build systems used by developers and AI teams across Asia
• Work at the intersection of AI models, routing, evaluation, reliability, and developer tools
• Help establish a regional technical capability in AI infrastructure
• Receive a competitive salary and share-option opportunity, subject to formal scheme terms