Senior Fullstack Engineer: Build Scalable Loyalty Platform

Ultra Voucher; Indonesia; On-site; IDR 360,000,000 - 600,000,000; Full time

Job summary

Ultra Voucher is seeking a Senior Fullstack Engineer to lead the design, development, and maintenance of scalable backend and frontend applications. The role emphasizes building production-grade systems with Node.js/NestJS and React/Next.js, implementing microservice architectures, and optimizing data models across SQL/NoSQL databases.

The position requires mentoring junior engineers, collaborating with stakeholders, and delivering robust API documentation and secure API integration.

Qualifications

• Bachelor's degree in Computer Science, Information Technology, or a related field.
• 5–8+ years of professional experience as a Fullstack Engineer or in an equivalent role.
• Strong proficiency in Node.js and NestJS, with proven experience building production-grade backend systems.
• Deep expertise in React and Next.js, including state management (Redux or Zustand), SSR/SSG, and frontend architecture.
• Has deep ability in Golang.
• Advanced knowledge of SQL databases (Oracle, PostgreSQL) and NoSQL databases (MongoDB), including data modelling and query optimisation.
• Extensive experience with microservice architecture, message queues (Kafka or RabbitMQ), and distributed systems.
• Proven experience with Redis caching strategies, including distributed caching and cache invalidation.
• Strong understanding of RESTful API design, GraphQL, and API security best practices (OAuth, JWT).
• Experience with CI/CD pipelines, containerization (Docker), and orchestration tools (Kubernetes).
• Demonstrated ability to mentor engineers, conduct code reviews, and lead technical initiatives.
• Experience in banking, financial services, or loyalty/rewards systems is highly preferred.

Responsibilities

• Lead the design, development, and maintenance of scalable backend applications using Node.js and NestJS, following architectural best practices and design patterns.
• Architect and manage microservice integrations using message queue systems such as Kafka and RabbitMQ, focusing on reliability, fault tolerance, and scalability.
• Design and optimise data models across SQL and NoSQL databases, ensuring data integrity, performance, and scalability.
• Implement advanced caching strategies using Redis to optimise application performance, including distributed caching and cache invalidation patterns.
• Collaborate with business stakeholders to translate business requirements into technical solutions and architectural decisions.
• Develop and maintain comprehensive API documentation and establish API design standards for frontend and third-party integrations.
• Establish testing strategies, conduct code reviews, and mentor junior and middle-level engineers to maintain code quality.
• Lead incident response and troubleshooting for production issues, and implement proactive monitoring, alerting, and logging strategies.
• Architect, develop, and maintain scalable frontend applications using React and Next.js.
• Establish and enforce coding standards, best practices, and reusable component patterns across the engineering team.
• Ensure cross-browser compatibility, responsiveness, accessibility, and frontend performance optimisation.

Skills

Node.js

NestJS

React

Next.js

Redux

Zustand

Golang

SQL databases

Oracle

PostgreSQL

MongoDB

NoSQL

Microservices

Kafka

RabbitMQ

Redis

REST API

GraphQL

OAuth

JWT

CI/CD

Docker

Kubernetes

Mentoring

Code reviews

Leadership

Finance domain

Education

Bachelor's degree in Computer Science / IT

Tools

Git

Docker

Kubernetes

Job description

Ultra Voucher is seeking a Senior Fullstack Engineer to lead the design, development, and maintenance of scalable backend and frontend applications. The role emphasizes building production-grade systems with Node.js/NestJS and React/Next.js, implementing microservice architectures, and optimizing data models across SQL/NoSQL databases.

The position requires mentoring junior engineers, collaborating with stakeholders, and delivering robust API documentation and secure API integration.