Fullstack Engineer (GenAI)

USER EXPERIENCE RESEARCHERS PTE. LTD.; Singapore; On-site; SGD 120,000 - 150,000; Full time

Job summary

USER EXPERIENCE RESEARCHERS PTE. LTD. seeks an experienced software engineer to lead end-to-end AI-enabled solutions in Singapore. You will embed with business units to shape data workflows and define measurable success criteria.

You'll prototype rapidly, build backend services with Python, FastAPI, and PostgreSQL, and design integrations across enterprise systems. You will balance speed with reliability and governance for responsible AI.

Qualifications

• 5+ years of software engineering experience with ownership of production applications.
• Backend engineering with Python or another modern backend language, API design, asynchronous processing, integration patterns, testing, debugging, and system architecture.
• Database & Data Engineering: strong experience with relational databases (prefer PostgreSQL), data modelling and query optimization; knowledge of data pipelines, search, and vector retrieval.
• GenAI & Agentic Systems: hands-on experience building LLM-enabled applications, RAG solutions, tool-calling agents, or automated workflows using LangGraph, LangChain, LlamaIndex, n8n, or equivalent.
• Cloud & Production Delivery: practical experience deploying and operating cloud-native applications; familiarity with AWS Bedrock and OpenSearch; Azure/GCP acceptable.
• Stakeholder Partnership: strong communication and facilitation skills with non-technical users, ability to clarify needs and drive adoption.
• Delivery Mindset: comfortable in ambiguous environments, balancing user value, speed, security, reliability.

Responsibilities

• Embed with business units to understand workflows, pain points, data, constraints, and intended outcomes; translate needs into prioritised use cases, user stories, solution designs, and measurable success criteria.
• Rapid Prototyping & Iterative Delivery: build working prototypes quickly, validate with users, and iterate based on evidence; balance speed with maintainable engineering.
• Agentic Workflow Engineering: design and implement reliable AI workflows and agents using Python-based frameworks and orchestration tools such as LangGraph, LangChain, n8n, or equivalent.
• Custom Application Development: build fit-for-purpose applications around business use cases, including backend services, APIs, integrations, authentication, workflow logic, and lightweight UIs.
• Data & Knowledge Integration: design robust data ingestion, transformation, and retrieval pipelines; integrate enterprise systems, databases, document repositories, APIs, and search or vector services.
• Backend & Database Engineering: develop secure, scalable backend services and APIs; design relational data models using Python, FastAPI, and PostgreSQL.
• AI Quality, Evaluation & Observability: define evaluation datasets and acceptance criteria; test solution quality, reliability, latency, cost, and tool-call success; implement tracing and monitoring.
• Security, Governance & Responsible AI: apply secure engineering practices, least-privilege access, data protection, and human oversight in line with security and responsible AI requirements.
• Deployment, Adoption & Handover: own production readiness, testing, rollout, documentation, user enablement, support, and knowledge transfer.

Skills

Python

API design

Asynchronous processing

PostgreSQL

LangGraph

LangChain

n8n

LLM-enabled applications

Cloud delivery

Stakeholder collaboration

Tools

LangGraph

LangChain

LlamaIndex

n8n

Flowise

PostgreSQL

FastAPI

AWS Bedrock OpenSearch

Azure/GCP

Job description

Key Responsibilities

• Business Discovery & Solution Shaping: Embed with business units to understand operational workflows, pain points, data, constraints, and intended outcomes. Facilitate discovery sessions, challenge assumptions, and translate needs into prioritised use cases, user stories, solution designs, and measurable success criteria.
• Rapid Prototyping & Iterative Delivery: Build working prototypes quickly, validate them with users, and iterate based on evidence. Balance speed with maintainable engineering and take viable solutions through production deployment.
• Agentic Workflow Engineering: Design and implement reliable AI workflows and agents using Python-based frameworks and orchestration tools such as LangGraph, LangChain, n8n, or equivalent technologies. Combine deterministic steps, LLM reasoning, tool calling, state management, human approvals, and exception handling as appropriate.
• Custom Application Development: Build fit-for-purpose applications around business use cases, including backend services, APIs, integrations, authentication, workflow logic, and lightweight user interfaces where needed.
• Data & Knowledge Integration: Design robust data ingestion, transformation, and retrieval pipelines. Integrate enterprise systems, databases, document repositories, APIs, and search or vector services while maintaining data quality, lineage, and access controls.
• Backend & Database Engineering: Develop secure, scalable backend services and APIs, and design relational data models using technologies such as Python, FastAPI, and PostgreSQL. Diagnose complex integration, performance, and state-management issues.
• AI Quality, Evaluation & Observability: Define evaluation datasets and acceptance criteria; test solution quality, reliability, latency, cost, and tool-call success; implement tracing and monitoring; and continuously improve prompts, retrieval, workflows, and safeguards.
• Security, Governance & Responsible AI: Apply secure engineering practices, least-privilege access, data protection, prompt-injection defences, output controls, auditability, and human oversight in line with applicable security, governance, and responsible AI requirements and the risk profile of each use case.
• Deployment, Adoption & Handover: Own production readiness, testing, rollout, documentation, user enablement, support, and knowledge transfer. Track adoption and business outcomes and incorporate field learnings into reusable patterns and improvements to the core platform.

Qualifications

• Experience: 5+ years of software engineering experience, including demonstrated ownership of production applications from ambiguous requirements through deployment and support.
• Backend Engineering: Strong proficiency in Python or another modern backend language, API design, asynchronous processing, integration patterns, testing, debugging, and system architecture.
• Database & Data Engineering: Strong experience with relational databases, preferably PostgreSQL, including data modelling and query optimization; practical knowledge of data pipelines, search, and vector retrieval is also required.
• GenAI & Agentic Systems: Hands-on experience building LLM-enabled applications, RAG solutions, tool-calling agents, or automated workflows using frameworks such as LangGraph, LangChain, LlamaIndex, n8n, or equivalent.
• Cloud & Production Delivery: Practical experience deploying and operating cloud-native applications. Familiarity with AWS and services such as Bedrock and OpenSearch is preferred, although equivalent Azure or GCP experience is acceptable.
• Stakeholder Partnership: Strong communication and facilitation skills, with the ability to work directly with non-technical users, clarify business needs, explain trade-offs, manage expectations, and drive adoption.
• Delivery Mindset: Comfortable working in ambiguous environments, learning unfamiliar business domains quickly, and balancing user value, delivery speed, security, reliability, and maintainability.

Bonus Points

• Forward Deployment: Experience in consulting delivery, solutions engineering, internal product delivery, or another role involving direct collaboration with users and end-to-end implementation.
• Workflow Automation: Experience with visual workflow builders such as n8n or Flowise, including custom nodes, integrations, credential handling, and operational support.
• Evaluation & Observability: Experience with LLM evaluation, tracing, observability, red-teaming, or quality assurance tools and methods.
• Regulated Environments: Experience delivering applications subject to stringent data privacy, cybersecurity, accessibility, or applicable regulatory and organizational requirements.