Senior Fullstack Developer

SEDHA CONSULTING PTE. LTD.; Singapore; On-site; SGD 120,000 - 160,000; Full time

Job summary

SEDHA CONSULTING PTE. LTD. in Singapore seeks a Senior Full-Stack Developer to lead the technical development of a mobile web app and PWA project.

You will unite frontend, backend and cloud infrastructure, ensuring scalable, high-performance, and secure web applications while collaborating with stakeholders and delivery teams. You will drive architecture across React Native, Node.js, and cloud services, with emphasis on security, observability, and automated releases.

Qualifications

• Degree or Diploma in Computer Science, Engineering, IT, or related discipline.
• 7+ years in full-stack web development with proven project delivery.
• 2-3 years in senior technical or consulting roles; client-facing experience.
• Experience with Git workflows like GitFlow or trunk-based development.

Responsibilities

• Own end-to-end application development across frontend, backend, and cloud.
• Design, develop, and maintain responsive, accessible, and performant web apps.
• Lead frontend architectures using React Native for enterprise-level reusability and security.
• Develop and architect high-performance backend services and APIs with reliability, security, and observability.
• Lead WhatsApp Business API integration and provide technical consultation on messaging workflows.
• Continuously evaluate emerging tech to improve performance and productivity.
• Translate business requirements into technical solutions and lead stakeholder discussions.
• Proactively resolve complex bugs and performance issues.
• Drive CI/CD deployment strategies and automated releases.
• Establish automated infrastructure provisioning and cloud deployment strategies.
• Ensure comprehensive full-stack security including authentication, authorization, API security.

Skills

Full-stack development

React.js

React Native

Node.js

API design

Cloud architecture

Security-by-design

CI/CD practices

Stakeholder management

Education

Degree in Computer Science or related

Tools

Docker

Kubernetes

GitHub Actions

Terraform

OpenTelemetry

Datadog

ELK Stack

Job description

Position Overview

We are seeking an experienced Senior Full-Stack Developer to lead the technical development and delivery of our mobile web application/progressive web app (PWA) project. The successful candidate will provide expert technical consultation, drive development excellence, and ensure the delivery of scalable, high-performance, and secure web applications whilst working closely with stakeholders and development teams.

Key Responsibilities

• Take full ownership of end-to-end application development, integrating frontend, backend, and cloud infrastructure
• Design, develop, and maintain advanced responsive, accessible, and performant web applications
• Implement frontend architectures using React Native, ensuring enterprise-level reusability, scalability, and security
• Develop and architect high-performance backend services and APIs, ensuring reliability, security, and observability
• Lead WhatsApp Business API integration implementation and provide technical consultation on messaging platform integrated with backend business workflow
• Continuously evaluate and adopt emerging technologies to improve application performance and developer productivity
• Lead technical discussions with stakeholders and translate business requirements into technical solutions
• Proactively identify and resolve complex bugs and performance issues
• Drive continuous improvement in software quality and development processes
• Lead the design and optimisation of full-stack CI/CD deployment strategies, ensuring seamless and automated releases
• Establish automated infrastructure provisioning, monitoring, and cloud deployment strategies
• Ensure comprehensive full-stack security implementation, including authentication, authorization, API security, and frontend security best practices
• Lead IM8 security controls implementation and provide consultation on government security frameworks
• Establish security review processes and ensure adherence to government compliance requirements
• Drive security-first development practices and provide security consultation to development teams

Required Qualifications

Education and Experience

• Degree or Diploma in Computer Science, Computer or Electronics Engineering, Information Technology, or related disciplines
• Minimum 7 years of experience in full-stack web development with proven track record of delivering complex projects
• Minimum 2-3 years of experience in senior technical or consulting roles
• Experience in client-facing consulting and stakeholder management
• Strong proficiency in both frontend and backend development with architectural knowledge
• Experience with Git and advanced branching workflows (GitFlow, trunk-based development)

Frontend Technologies

• Expert-level experience with React.js and modern frontend frameworks (Next.js, Vue.js, Angular, or Svelte)
• Extensive mobile app development expertise using ReactNative (critical requirement)
• Advanced knowledge of UI component libraries such as Material-UI, Tailwind CSS, or Bootstrap
• Experience with wireframing and prototyping tools (Figma)and design system implementation
• Deep understanding of progressive web app development and modern frontend architectures

Backend Technologies

• Advanced proficiency in Node.js, Express.js, or NestJS
• Strong experience with additional backend technologies such as Ruby on Rails, Java/Kotlin (Spring Boot), Python (Django, Flask, FastAPI), or Golang
• Expert-level experience in API design principles, including RESTful APIs, GraphQL, gRPC, and WebSockets for service communication
• Advanced knowledge of API rate limiting, caching strategies (Redis, Varnish), and performance optimisations
• Strong understanding of backend service scalability strategies (horizontal scaling, autoscaling, load balancing)

Observability & Monitoring

• Advanced experience implementing application performance monitoring (APM) tools (Datadog, New Relic, Sentry, Prometheus, OpenTelemetry)
• Expert knowledge of logging frameworks (ELK Stack, Loki, Fluentd) to track and debug issues across distributed systems

DevOps, Cloud, and Infrastructure

• Advanced experience with CI/CD pipelines (GitHub Actions, GitLab CI, ArgoCD, Jenkins)
• Expert-level hands-on experience with cloud platforms(AWS, Azure, Google Cloud, Cloudflare Workers)
• Extensive experience with Government Commercial Cloud(GCC) environment
• Advanced experience with containerisation and orchestration (Docker, Kubernetes)
• Strong familiarity with Infrastructure as Code (IaC) tools(Terraform, CloudFormation, Pulumi)

Security Best Practices

• Expert knowledge of frontend security (CSP, CORS, XSS prevention)
• Advanced experience with backend security (OAuth, JWT, API rate limiting, encryption)
• Deep understanding of IM8 security policies and government compliance frameworks
• Strong familiarity with cloud security (IAM, SecretsManagement, OWASP Top 10)
• Experience implementing comprehensive security