Remote Senior Fullstack Javascript Developer

**Remote Senior Fullstack JavaScript Developer**
- Company: itworks.asia's Client
- Working Location: Remote
- Working hours: From 15:00 to 23:00 VN timezone
- Salary Range: up to 55M net
- SHUI: No
- YoE: 5+
- English: Advanced

We’re looking for a **Fullstack Developer** to **fix, clean, and improve** our system - two profitable SaaS products generating used by **8,000+ creators** worldwide. **This isn’t about building from scratch.** If you want greenfield projects, this isn’t for you.If you love **turning messy code into something scalable and maintainable** while building features that impact thousands of users daily, keep reading.

**Responsibilities**:
**Code Quality & Performance**
- **Refactor and optimize** our TypeScript/Next.js codebase for better performance and maintainability
- **Identify and fix bugs** across frontend and backend systems
- **Improve code architecture** to support rapid feature development
- **Optimize database queries** and API performance for high-traffic scenarios

**Feature Development**
- **Build new features** that enhance user experience and drive growth
- **Integrate with social media APIs** (Twitter Enterprise, LinkedIn) for new functionality
- **Implement AI-powered features** for content generation and optimization
- **Create responsive UI components** that work seamlessly across devices

**Technical Leadership**
- **Challenge product requests** with technical expertise and suggest better solutions
- **Balance speed vs quality** in feature delivery decisions
- **Mentor junior developers** and contribute to engineering best practices
- **Participate in technical planning** and architecture discussions

**Operations & Support**
- **Support customer success** by resolving technical issues and performance bottlenecks
- **Collaborate with DevOps** on deployment and infrastructure improvements

**Tech Stack**

**Frontend**:

- TypeScript, React, Next.js
- Tailwind CSS, Styled Components
- State Management (Redux/Zustand)

**Backend**:

- Node.js, Express/Fastify
- TypeScript for type safety
- RESTful APIs & GraphQL

**Database & Storage**:

- PostgreSQL, Redis
- MongoDB for analytics data
- Cloud storage (AWS S3)

**Infrastructure**:

- Google Cloud Platform (GCP)
- Docker, Kubernetes
- CI/CD pipelines

**APIs & Integrations**:

- Twitter Enterprise API
- LinkedIn APIs
- Stripe, SendGrid
- Various AI/ML services

**Requirements**:
**Must-Haves**:

- **English proficiency** for technical communication and documentation
- **5+ years of fullstack development experience** with modern JavaScript/TypeScript
- **Proven track record** of refactoring and optimizing legacy codebases
- **Strong problem-solving skills** with ability to debug complex issues
- **Experience with React/Next.js** and Node.js ecosystems
- **Database optimization experience** (PostgreSQL preferred)
- **API integration experience** and understanding of rate limiting, authentication
- **Ownership mentality** - you take responsibility for your code and its impact

**Nice-to-Haves**:

- **Social media platform experience** (Twitter, LinkedIn APIs)
- **Google Cloud Platform (GCP)** knowledge and deployment experience
- **AI/ML integration experience** for content generation
- **Open source contributions** or technical blog writing
- **B2B SaaS experience** with subscription models

**Personality & Work Style**:

- **Detail-oriented** with passion for clean, maintainable code
- **Proactive problem solver** who identifies issues before they become critical
- **Fast learner** who can quickly understand existing codebases
- **Team player** who enjoys collaboration and knowledge sharing
- **User-focused** with understanding of how technical decisions impact UX

**Benefits**
- **Competitive salary**: 55,000,000 VND ( NET ) / month + performance bonus
- **100% remote work**:

- Allowance for remote working set-up: devices and electricity fee
- 12 days annual leaves + national public holidays
- Working hours: 8h/day, from 3:00 PM to 11:00 PM, Mon-Fri
- Working in English-speaking working experience with French clients

**Interview Process**

**1. Initial Screening** (30 min)
- Technical background discussion
- Motivation and culture fit assessment

**2. Technical Interview** (60 min)
- Live coding session focusing on refactoring existing code
- Debugging and optimization scenarios

**3. Final Interview** (45 min)
- Meet with engineering leadership
- Discuss technical vision and growth opportunities
- Q&A about role, team, and company

Industry

Pay: Up to 55,000,000₫ per month

Application Question(s):

- How about your English skills? (B1, B2, C1 or C2)?
- When can you start with us? (days)
- Year of birth?
- How about your expected net salary? (VND/month)
- How many years of experience do you have with React.js?
- Do you have experience of building products from the scratch?
- Do you have experience of building products from product start-up company?
- How many years of experience do you have with Node.js?