Senior Fullstack Engineer

USER EXPERIENCE RESEARCHERS PTE. LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

USER EXPERIENCE RESEARCHERS PTE. LTD. is seeking a senior software enginer to embed with business units, shape AI-powered workflows, and deliver production-grade solutions.

You will own backend services, APIs, and data pipelines, balancing rapid prototyping with reliability. You will work with Python, FastAPI, PostgreSQL, and GenAI toolchains (LangGraph, LangChain, n8n). The role requires 5+ years in software engineering and strong collaboration with non-technical stakeholders to achieve

Qualifications

• 5+ years of software engineering experience with ownership of production apps.
• Backend proficiency in Python, API design, asynchronous processing, integration patterns.
• Relational databases experience, preferably PostgreSQL, with data modeling and queries.
• GenAI and agentic systems experience using LangGraph, LangChain, or similar.
• Cloud deployment experience (AWS preferred, Bedrock/OpenSearch familiarity).
• Strong stakeholder collaboration and ability to translate business needs into technical solutions.

Responsibilities

• Embed with business units to translate workflows into use cases and metrics.
• Prototype rapidly and validate with users, iterating with evidence.
• Design and implement AI workflows and agent-based solutions.
• Develop backend services, APIs, and integrations with secure data handling.
• Build data pipelines and ensure data quality and governance.
• Monitor quality, latency, and reliability; iterate prompts and tooling.
• Ensure production readiness, documentation, and handover to teams.

Skills

Python

Backend API design

PostgreSQL

Data pipelines

LangGraph

LangChain

n8n

LLM-enabled apps

Tools

LlamaIndex

LangGraph

LangChain

n8n

PostgreSQL

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.