Full Stack Developer

RAPSYS TECHNOLOGIES PTE LTD; Singapore; On-site; SGD 70,000 - 110,000; Full time

Job summary

RAPSYS TECHNOLOGIES PTE LTD is seeking a Mid to Senior Full Stack Developer to design, develop, and maintain applications supporting business operations. The role covers frontend and backend development, API integrations, data migration, and modernization while collaborating with cross-functional teams to deliver scalable solutions.

The candidate will design workflows, forms, and integrations to improve processes, develop backend services and APIs, and ensure data integrity through migration

Qualifications

• 4+ years in mid/senior level development roles.
• Experience designing, developing and maintaining full stack applications.
• Experience with data migration, data mapping and data quality checks.

Responsibilities

• Design, develop, and deploy full stack applications aligned with business requirements.
• Translate requirements into technical solutions; build workflows and integrations to improve processes.
• Develop and integrate backend services and APIs; perform testing, debugging, and ongoing support.
• Collaborate with stakeholders and solution architects; maintain technical documentation and best practices.
• Take ownership of modules and contribute to end-to-end delivery including data migration activities, data mapping, validation and cutover planning.

Skills

Full stack dev

Frontend development

Backend development

API integrations

Data migration

SQL

Sybase databases

Azure cloud

Agile

Mobile app development

System migration

Tools

Microsoft Azure

SQL

Sybase

REST APIs

CI/CD

Job description

Job Title: Full Stack Developer – Data Migration

Mid-Level: 4+ years

Senior-Level: 7+ years

We are looking for a Full Stack Developer to design, develop, enhance, and maintain applications supporting business operations. The role involves frontend and backend development, API integrations, data migration, and application modernization while working with cross-functional teams to deliver reliable and scalable solutions.

• Design, develop, and deploy full stack applications aligned with business requirements.
• Translate functional requirements into practical technical solutions.
• Build workflows, forms, and integrations to improve business processes.
• Develop and integrate backend services and APIs.
• Perform testing, debugging, and ongoing application support.
• Support enhancements, bug fixes, and continuous improvements.
• Collaborate with stakeholders, business analysts, and solution architects.
• Maintain technical documentation and follow development best practices.
• Take ownership of assigned modules and contribute to end-to-end delivery.
• Design and execute data migration activities, ensuring data integrity and accuracy.
• Analyse legacy data structures and map them to target data models.
• Develop and optimise data migration scripts and pipelines.
• Validate migrated data through reconciliation, testing, and quality checks.
• Support cutover planning and execution.
• Familiarity with Java-based development environments and frameworks.
• Knowledge of SQL and Sybase databases.
• Exposure to API development and system integrations.
• Experience with data migration activities and tools.
• Basic understanding of cloud platforms, preferably Microsoft Azure.
• Strong problem-solving and troubleshooting skills.
• Exposure to system migration or modernization initiatives.
• Experience with enterprise-scale applications or public sector projects is an advantage.
• Familiarity with Agile development and collaborative delivery environments.
• Mobile application development experience on iOS and Android.
• Experience in application modernization and large-scale system migration.