Full Stack Engineer

0123 DIGITAL PTE. LTD.; Singapore; On-site; SGD 115,000 - 166,000; Full time

Benefits offered by this job

Fully remote

Job summary

01 Digital is hiring a Full Stack Engineer to build AI agents and enterprise software for a global client base. You will own features across frontend and backend, from planning to deployment, working with the founder and Engineering Lead in a fully remote team.

The role requires 4–7 years in software engineering plus hands-on AI development. Expect strong JavaScript/TypeScript, React and Node.js experience, API design, and remote collaboration across time zones.

Qualifications

• 4–7 years of professional software engineering experience.
• At least 1 year hands-on AI application development.
• Strong JavaScript/TypeScript skills with React and Node.js.
• Experience designing APIs and working with databases.
• Familiarity with LLM APIs and AI tool usage.
• Ability to explain technical decisions and review AI-generated code.

Responsibilities

• Translate business requirements into technical plans and tasks.
• Build web interfaces, backend services, APIs and integrations.
• Design data models and implement workflows, auth and access controls.
• Develop AI agents using business data and external services.
• Test AI behavior and outputs; review technical decisions.
• Deploy, monitor and improve reliability and performance.
• Communicate progress and coordinate with remote engineers.

Tools

Next.js

Hono/Express

PostgreSQL

Prisma

MongoDB

Redis

Directus

Mastra

Langfuse

Job description

Full Stack Engineer — AI Agents and Enterprise Software

01 Digital | Full-time, permanent | Fully remote

Reports to: Engineering Lead

Location: Open internationally, with a preference for candidates based in Malaysia, India or Vietnam, or working within similar time zones

Probation: Three months

About 01 Digital

01 Digital builds AI agents and enterprise software for Singapore SMEs and established organisations. Over the past three years, we’ve worked with more than 40 businesses across Southeast Asia and EMEA, with clients in wellness, healthcare, retail, education and safety consultancy.

We work closely with the people running these organisations to understand their operations and build software around their needs. We’re growing our engineering team to deliver AI applications and business systems for larger clients.

The role

You’ll work with our founder, Engineering Lead and fellow engineers to build AI agents, internal tools, content management systems and CRM platforms. You’ll independently plan and deliver features across the frontend and backend, owning your work through testing, deployment and ongoing operation.

You’ll report to the Engineering Lead, who provides technical direction and reviews key decisions. You’ll contribute to planning, code reviews and engineering standards across the team.

What you’ll do

• Turn business requirements into technical plans, break features into tasks, estimate effort and identify dependencies.
• Build web interfaces, backend services, APIs and integrations with external systems.
• Design database models and implement business workflows, authentication and access controls.
• Develop AI agents that use business data, tools and external services to carry out defined tasks. Build retrieval and context management into their workflows.
• Test application behaviour and AI outputs, including edge cases, failures and recovery. Review code and document technical decisions.
• Deploy and monitor your features, investigate production issues and improve reliability, performance and maintainability.
• Communicate progress and blockers, coordinate with other engineers and use AI development tools while taking responsibility for the code you ship.

What you’ll bring

• 4–7 years of professional software engineering experience, including independent delivery of full stack features.
• At least one year of hands‑on AI application development experience and practical knowledge of building agents.
• Strong JavaScript and TypeScript skills, with experience building React frontends and Node.js backend services.
• Experience designing APIs, integrating third‑party services and working with databases.
• Working knowledge of LLM APIs, tool calling, structured outputs, retrieval and context management. Familiarity with AI application libraries and the trade‑offs involved in choosing them.
• Experience testing, deploying, monitoring and troubleshooting production software.
• The ability to explain technical decisions, review AI-generated code critically and identify decisions that need input from the Engineering Lead.
• Clear written communication and reliable coordination within a remote engineering team.

Preferred experience

• Shipping and maintaining AI agents in production, including evaluating their behaviour and improving reliability, latency and cost.
• Deploying and operating applications on Azure or AWS.
• Building CMS, CRM or internal enterprise applications.
• Working with technologies used across our projects: Next.js, Hono or Express; PostgreSQL and Prisma; MongoDB; Redis and background job queues; Directus; Mastra, AI SDK or Langfuse.

Working at 01 Digital

You’ll work directly with the founder and Engineering Lead in a small engineering team, with ownership of features used in client operations. The work spans AI development and full stack engineering across different industries, giving you scope to build new systems and improve existing applications.

This is a fully remote, permanent role. We welcome international applicants working within time zones similar to Malaysia, India and Vietnam.

Learn more about 01 Digital at https://01-digital.com.