• Expertini Resume Scoring: Our Semantic Matching Algorithm evaluates your CV/Résumé before you apply for this job role.
Singapore Jobs Expertini

Full Stack Developer – Contract Job Opening In Singapore, Singapore – Now Hiring Twine


Job description

The project requires an experienced freelance developer to resolve critical authentication and authorization failures and complete core AI and payments functionality for a web-based divination platform built with and React.

The immediate priorities are restoring a functioning admin permission system so dashboard access is reliable, finishing integration with the OpenAI Assistant API to deliver personalized readings, and implementing a secure checkout flow supporting Stripe and PayPal.

The codebase uses Supabase for backend services and authentication and is hosted on Vercel; some components (notably the shopping cart) may need to be rebuilt rather than patched.

A fresh start for authentication/data is acceptable.

The engagement is remote, short-term, and outcome-driven with the expectation of thorough testing and deployment-ready deliverables.

Deliverables

  • Fix authentication and permission flows so admin users can reliably access the dashboard and role-based permissions map correctly across the site (Supabase auth integration, JWT/session handling, routes protection).

  • Audit and repair or replace the existing cart implementation: restore add/update/remove item behavior, persistent cart state, and correct pricing calculations.

    Provide unit/integration tests for core cart flows.

  • Finish integration of the OpenAI Assistant API for personalized readings: implement conversation/session management, ensure safe prompt handling, support user-specific context, and integrate the assistant responses into the UI with graceful error handling and rate-limit awareness.

  • Implement checkout flow supporting both Stripe (recommended: Stripe Checkout or Payment Intents API) and PayPal (smart payment buttons or REST integration), with server-side order creation, webhook handling, and order state persisted to Supabase.

    Include basic receipt/invoice generation and transactional email hooks (or clear instructions for plugging in an email provider).

  • Deploy all fixes to the Vercel environment and verify environment variables/secrets are configured securely.

    Provide a clear deployment checklist and rollback instructions.

  • Deliver final production-ready code, documentation for setup and maintenance (README, env variables, migration steps), and a short handover demo recording (screen-share walkthrough) showing admin login, a sample reading via the Assistant, and a complete checkout flow.

Requirements

  • Proven experience with and React in production applications and practical knowledge of server-side rendering (SSR) and API routes.

  • Hands-on experience with Supabase authentication, policies (RLS), and common pitfalls in role-based access control.

  • Demonstrable experience integrating OpenAI APIs, preferably the Assistant API or similar conversational endpoints, including safe prompt design and session handling.

  • Experience implementing Stripe and PayPal payments (server-side and client-side integration), webhooks, and basic fraud/error handling.

  • Familiarity with or comparable AI integration frameworks is required.

  • Comfortable working with Vercel deployments and environment configuration.

  • Ability to start immediately and deliver production-ready fixes and features by the requested timeline (target delivery dates to be coordinated with the project owner).

  • Strong communication skills, timely updates, and willingness to provide short technical documentation and a demo on completion.

  • Mid-level to senior technical competency; portfolio or references for similar projects preferred.

About Twine

Twine is a leading freelance marketplace connecting top freelancers, consultants, and contractors with companies needing creative and tech expertise.

Trusted by Fortune 500 companies and innovative startups alike, Twine enables companies to scale their teams globally.

Our Mission

Twine's mission is to empower creators and businesses to thrive in an AI-driven, freelance-first world.

Required Skill Profession

Other General


  • Job Details

Related Jobs

RMA CONSULTANTS PTE LTD hiring Full Stack Developer/Contract/West Job in Singapore
RMA CONSULTANTS PTE LTD
Singapore
U3 hiring Full Stack Developer Job in singapore, singapore, singapore, singapore, Singapore
U3
singapore, singapore, singapore, singapore, Singapore
ST Engineering hiring Full Stack Developer Job in Singapore
ST Engineering
Singapore
PayPal hiring Full Stack Developer Job in Singapore
PayPal
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
ST Engineering hiring Full Stack Developer Job in Singapore
ST Engineering
Singapore
Idemia hiring Full Stack Developer Job in Singapore
Idemia
Singapore
Nodeworthy hiring Full Stack Developer Job in Singapore
Nodeworthy
Singapore
Vertis Digital hiring Full Stack Developer Job in Singapore
Vertis Digital
Singapore
STAR CAREER CONSULTING PTE LTD hiring Full Stack Developer Job in Singapore
STAR CAREER CONSULTING PTE LTD
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Nodeworthy hiring Full Stack Developer Job in Singapore
Nodeworthy
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
WRK Digital hiring Full Stack Developer Job in Singapore
WRK Digital
Singapore
STAR CAREER CONSULTING PTE LTD hiring Full Stack Developer Job in Singapore
STAR CAREER CONSULTING PTE LTD
Singapore
Vertis Digital hiring Full Stack Developer Job in Singapore
Vertis Digital
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
Flintex Consulting Pte Ltd hiring Full Stack Developer Job in Singapore
Flintex Consulting Pte Ltd
Singapore
IDEMIA Group hiring Full Stack Developer Job in Singapore
IDEMIA Group
Singapore
ADDX hiring Full Stack Developer Job in Singapore
ADDX
Singapore
Vinova Pte. Ltd. hiring Full-Stack Developer Job in Singapore
Vinova Pte. Ltd.
Singapore
FlocCare Pte. Ltd. hiring Full Stack Developer Job in Singapore
FlocCare Pte. Ltd.
Singapore
ORANGEKLOUD PTE. LTD. hiring Full Stack - Developer Job in Singapore
ORANGEKLOUD PTE. LTD.
Singapore

Unlock Your Full Stack Potential: Insight & Career Growth Guide


Real-time Full Stack Jobs Trends (Graphical Representation)

Explore profound insights with Expertini's real-time, in-depth analysis, showcased through the graph here. Uncover the dynamic job market trends for Full Stack in Singapore, Singapore, highlighting market share and opportunities for professionals in Full Stack roles.

2562 Jobs in Singapore
2562
2245 Jobs in Singapore
2245
Download Full Stack Jobs Trends in Singapore and Singapore

Are You Looking for Full Stack Developer – Contract Job?

Great news! is currently hiring and seeking a Full Stack Developer – Contract to join their team. Feel free to download the job details.

Wait no longer! Are you also interested in exploring similar jobs? Search now: .

The Work Culture

An organization's rules and standards set how people should be treated in the office and how different situations should be handled. The work culture at Twine adheres to the cultural norms as outlined by Expertini.

The fundamental ethical values are:

1. Independence

2. Loyalty

3. Impartiapty

4. Integrity

5. Accountabipty

6. Respect for human rights

7. Obeying Singapore laws and regulations

What Is the Average Salary Range for Full Stack Developer – Contract Positions?

The average salary range for a varies, but the pay scale is rated "Standard" in Singapore. Salary levels may vary depending on your industry, experience, and skills. It's essential to research and negotiate effectively. We advise reading the full job specification before proceeding with the application to understand the salary package.

What Are the Key Qualifications for Full Stack Developer – Contract?

Key qualifications for Full Stack Developer – Contract typically include Other General and a list of qualifications and expertise as mentioned in the job specification. The generic skills are mostly outlined by the . Be sure to check the specific job listing for detailed requirements and qualifications.

How Can I Improve My Chances of Getting Hired for Full Stack Developer – Contract?

To improve your chances of getting hired for Full Stack Developer – Contract, consider enhancing your skills. Check your CV/Résumé Score with our free Tool. We have an in-built Resume Scoring tool that gives you the matching score for each job based on your CV/Résumé once it is uploaded. This can help you align your CV/Résumé according to the job requirements and enhance your skills if needed.

Interview Tips for Full Stack Developer – Contract Job Success

Twine interview tips for Full Stack Developer – Contract

Here are some tips to help you prepare for and ace your Full Stack Developer – Contract job interview:

Before the Interview:

Research: Learn about the Twine's mission, values, products, and the specific job requirements and get further information about

Other Openings

Practice: Prepare answers to common interview questions and rehearse using the STAR method (Situation, Task, Action, Result) to showcase your skills and experiences.

Dress Professionally: Choose attire appropriate for the company culture.

Prepare Questions: Show your interest by having thoughtful questions for the interviewer.

Plan Your Commute: Allow ample time to arrive on time and avoid feeling rushed.

During the Interview:

Be Punctual: Arrive on time to demonstrate professionalism and respect.

Make a Great First Impression: Greet the interviewer with a handshake, smile, and eye contact.

Confidence and Enthusiasm: Project a positive attitude and show your genuine interest in the opportunity.

Answer Thoughtfully: Listen carefully, take a moment to formulate clear and concise responses. Highlight relevant skills and experiences using the STAR method.

Ask Prepared Questions: Demonstrate curiosity and engagement with the role and company.

Follow Up: Send a thank-you email to the interviewer within 24 hours.

Additional Tips:

Be Yourself: Let your personality shine through while maintaining professionalism.

Be Honest: Don't exaggerate your skills or experience.

Be Positive: Focus on your strengths and accomplishments.

Body Language: Maintain good posture, avoid fidgeting, and make eye contact.

Turn Off Phone: Avoid distractions during the interview.

Final Thought:

To prepare for your Full Stack Developer – Contract interview at Twine, research the company, understand the job requirements, and practice common interview questions.

Highlight your leadership skills, achievements, and strategic thinking abilities. Be prepared to discuss your experience with HR, including your approach to meeting targets as a team player. Additionally, review the Twine's products or services and be prepared to discuss how you can contribute to their success.

By following these tips, you can increase your chances of making a positive impression and landing the job!

How to Set Up Job Alerts for Full Stack Developer – Contract Positions

Setting up job alerts for Full Stack Developer – Contract is easy with Singapore Jobs Expertini. Simply visit our job alerts page here, enter your preferred job title and location, and choose how often you want to receive notifications. You'll get the latest job openings sent directly to your email for FREE!