Full Stack Engineer (Backend)

USER EXPERIENCE RESEARCHERS PTE. LTD.; Singapore; On-site; SGD 90,000 - 120,000; Full time

Job summary

USER EXPERIENCE RESEARCHERS PTE. LTD. is seeking a backend-focused full-stack engineer to design and build core services for a cloud-based platform.

You will own API development, data modelling, and business logic, ensuring secure, scalable systems that support workflows across booking, approval, and CRM modules. You will collaborate with frontend, QA, and infrastructure teams, contribute to CI/CD pipelines, and address security findings while optimising performance and reliability in an AWS

Qualifications

• Experience with Node.js, TypeScript, Express.js or NestJS.
• Strong PostgreSQL/SQL skills including relational modelling and query optimisation.
• Design and implement REST APIs with secure authentication (OAuth2/OIDC, JWT, RBAC).
• Familiarity with AWS-hosted apps and services (Lambda, API Gateway, RDS/Aurora PostgreSQL, S3).
• DevOps familiarity: Git, CI/CD pipelines, Docker, environment variables.

Responsibilities

• Design, develop, and maintain backend services for a cloud-based platform.
• Collaborate with frontend, QA, and infra teams to deliver secure, reliable APIs.
• Develop and optimise workflows like booking, approval, case management, and CRM systems.
• Support CI/CD, deployment scripts, and database migrations.
• Address security findings from SAST/DAST/VA/PT reports.

Tools

Node.js

TypeScript

Express.js

NestJS

PostgreSQL

SQL

REST APIs

OAuth2/OIDC

JWT

RBAC

AWS (Lambda/API Gateway/RDS Aurora PostgreSQL/S3)

CloudWatch

Secrets Manager

CI/CD

Docker

OWASP Top 10

Unit testing

API testing

Integration testing

Job description

We are looking for a Backend-Focused Full-Stack Engineer to design and develop the core backend services for the cloud-based digital platform. The role will focus on APIs, databases, business logic and workflows, audit logging, reporting data, and integration readiness. This role will work closely with the Technical Lead, Frontend Engineer, QA Automation Engineer, and Infrastructure Team to deliver secure and reliable backend services that support the digital platform.

Key Responsibilities

• Backend Development: Design, develop, and maintain backend services using Node.js and TypeScript.
• Cloud Application Deployment: Develop backend services that can be deployed into AWS environments using approved deployment patterns.
• Workflow Systems: Design and develop booking, approval, case management, event management, CRM, or other workflow-heavy systems.
• CI/CD Support: Contribute to build scripts, deployment configuration, database migration automation, and pipeline troubleshooting.
• Security Remediation: Resolve findings from SAST, dependency scanning, secret scanning, DAST, and VAPT reports.

Required Qualifications

• Experience: At least 3-4 years of professional software development experience.
• Backend: Strong experience with Node.js, TypeScript, Express.js, or NestJS.
• Database: Strong experience with PostgreSQL, SQL, relational modelling, transactions, and query optimisation.
• API: Experience designing and implementing REST APIs.
• Authentication & Authorisation: Familiarity with OAuth2/OIDC, JWT/session handling, RBAC, and secure API access.
• AWS Application Awareness: Familiarity with AWS-hosted applications and services such as Lambda, API Gateway, RDS/Aurora PostgreSQL, S3, CloudWatch, and Secrets Manager.
• DevOps: Familiarity with Git, CI/CD pipelines, Docker basics, environment variables, and deployment troubleshooting.
• Security: Understanding of secure coding, OWASP Top 10, input validation, API security, dependency management, and vulnerability remediation.
• Testing: Experience with unit testing, API testing, and integration testing.