Kerja Sepenuh Masa, Full Stack Developer di WJ DIGITAL Federal Territory - Maukerja

Key Responsibilities

Full Stack Development

• Develop and maintain both backend and frontend components of WayJet.
• Build complete product features from database and backend services through APIs and user-facing interfaces.
• Develop new platform functionality and continuously improve existing systems.
• Write clean, maintainable and reusable code.
• Participate in testing, deployment and production support.

Backend & API Development

• Develop and maintain backend services primarily using Go (Golang).
• Design and maintain reliable REST APIs and platform services.
• Develop authentication, API key management, permissions, usage tracking and other core platform functions.
• Improve backend performance, scalability and reliability.
• Troubleshoot and resolve production issues.

AI Model & Provider Integration

• Integrate APIs from major AI model providers.
• Maintain a unified interface across different models and providers.
• Handle differences in API formats, authentication, rate limits, timeouts and error responses.
• Support OpenAI-compatible APIs and other provider-specific interfaces.
• Improve the process for adding new models and providers.
• Maintain reliable communication between WayJet and upstream AI services.

WayJet's public API currently exposes an OpenAI-compatible endpoint and also supports multiple providers behind a single API.

Routing & Reliability

• Develop and improve routing between different AI providers and models.
• Implement retry, fallback and failover mechanisms.
• Monitor provider availability, latency and error rates.
• Ensure service failures from individual providers have minimal impact on users.
• Improve overall platform availability and response performance.

Automatic failover and multi-provider routing are part of WayJet's intended infrastructure layer, rather than merely optional integrations.

Usage Tracking & Billing

• Develop and maintain API usage tracking and billing-related services.
• Accurately record model usage, token consumption, provider pricing and customer usage.
• Support different models and pricing structures.
• Maintain transaction and usage records.
• Ensure billing data is accurate, consistent and traceable.

WayJet currently uses a unified prepaid balance and meters usage across providers, so this is a core product function rather than a peripheral finance feature.

Streaming & API Performance

• Support streaming AI responses using technologies such as SSE.
• Handle long-running API connections, timeouts and cancellations correctly.
• Identify and improve API performance bottlenecks.
• Implement appropriate logging, monitoring and error handling.

WayJet's public API already supports token-by-token SSE streaming for chat completions.

Frontend Development

• Develop and maintain the WayJet web application using TypeScript and React.
• Build customer dashboards, developer tools and platform management interfaces.
• Develop pages for API keys, model management, usage, billing and account settings.
• Integrate frontend applications with backend APIs.
• Work with product and design team members to improve usability.

Database & Infrastructure

• Design and maintain application database structures.
• Work with PostgreSQL, Redis or similar technologies.
• Write and optimise database queries.
• Maintain data consistency and system performance.
• Support deployment, monitoring and production operations.

Team Collaboration

• Work closely with engineers, product and business team members.
• Participate in technical discussions, system design and code reviews.
• Translate product requirements into practical technical solutions.
• Maintain relevant technical documentation.
• Use AI-assisted development tools to improve development speed and quality.

Requirements

• 3 or more years of professional software development experience, including practical full-stack development experience.
• Strong backend development skills, preferably using Go (Golang).
• Practical frontend development experience with TypeScript and React.
• Good experience developing REST APIs and backend services.
• Experience integrating third-party APIs.
• Good understanding of relational databases such as PostgreSQL or MySQL.
• Experience with Redis or similar caching technologies.
• Good understanding of authentication, error handling, timeout and retry mechanisms.
• Familiar with Git and modern software development practices.
• Able to independently troubleshoot software and production issues.
• Comfortable working across frontend and backend depending on project needs.
• Good problem-solving and communication skills.

Preferred Experience

• Experience integrating OpenAI, Anthropic, Gemini or other AI/LLM APIs.
• Experience building API gateways, proxy services or API aggregation platforms.
• Experience integrating multiple upstream service providers.
• Experience with high-concurrency or high-availability applications.
• Experience with usage-based billing or metering systems.
• Experience with payment gateways, fintech or e-wallet platforms.
• Experience with SSE, WebSocket or other streaming technologies.
• Experience with Docker, CI/CD and cloud infrastructure.
• Experience with monitoring and observability tools.
• Experience developing SaaS, developer tools or API products.

• Familiarity with AI-assisted coding tools.