Freelance Developer

5 days ago


Singapore Twine Full time

Overview Join a project focused on developing a Chrome extension that streamlines the process for users to download their KSeF certificate from a government portal and upload it securely to a fintech SaaS platform. This role is ideal for an experienced developer with a strong background in browser extension development, particularly for Chrome, and an understanding of secure file handling and REST API integration. The extension will guide users through a step-by-step process, ensure compliance with Chrome Web Store requirements, and provide clear user feedback throughout. You will play a key role in both the technical build and the successful publication of the extension. Deliverables Develop a fully functional Chrome extension using Manifest v3, JavaScript or TypeScript, and Chrome APIs. Implement a guided workflow for users to download and upload KSeF certificates. Integrate secure file detection, handling, and REST API communication for uploads. Conduct validation checks and ensure GDPR compliance. Provide user and technical handover documentation. Assist with the Chrome Web Store submission process and address any compliance feedback. Deliver clean, well-documented source code. Requirements Proven experience building and publishing Chrome extensions, including Manifest v3. Proficiency in JavaScript or TypeScript and Chrome extension APIs. Strong understanding of secure file handling and authentication flows. Experience with REST API integration. Familiarity with GDPR and Chrome Web Store compliance. Ability to create clear user and technical documentation. Experience with fintech, ERP, or e-invoicing systems (especially Polish KSeF) is a plus. Available to start within 1–2 weeks and deliver within 2–4 weeks. Excellent communication skills and attention to detail. 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. Seniority Level Mid-Senior level Employment Type Contract Job Function Software Development #J-18808-Ljbffr


  • Web Developer

    1 week ago


    Singapore Twine Full time

    Web Developer (Freelance)Join to apply for the Web Developer (Freelance)role at Twine . This opportunity is designed for experienced web developers, web design agencies, and freelancers who regularly build websites for businesses requiring integrated


  • Singapore Twine Full time

    Freelance Application Developer (Remote)1 day ago Be among the first 25 applicants This is a unique opportunity for an experienced application developer to provide short-term mentorship to a company specializing in industrial automation solutions. The role is fully remote and focuses on guiding a skilled engineering team in the app and web domain, supporting...

  • Freelance Trainers

    1 week ago


    Singapore Just Fly It Pte Ltd Full time

    Join to apply for the Freelance Trainers role at Just Fly It Pte Ltd . Looking for aviation lovers to combine your passion with career. Responsibilities and qualifications include: Freelance opportunity Keen to teach and interact with students (be an instructor in schools)Willing and proactive to learn more Training provided Hourly rate Flexible schedule...


  • Singapore ELITE HOSPITALITY & CLEANING PTE. LTD. Full time

    This is a job you can do with your present job / freelance / interns - No prior experience is necessary - Manpower contracting in F&B - Should be highly motivated & self driven - High commission pay out - your income is linked to your performance - Contacts in F&B with HR / Managers will be added advantage - More details after reviewing your resume


  • Singapore Twine Full time

    Freelance Front End Developer - Part time Join to apply for the Freelance Front End Developer - Part time role at Twine Join a fast-growing direct-to-consumer brand in apparel and supplements as the lead designer and developer for Shopify stores. This role is ideal for a highly skilled creative who thrives on building viral landing pages and crafting...

  • Business Partner

    7 days ago


    Singapore TRIFIC SOLUTIONS PTE. LTD. Full time

    **Job Opportunity: Business Partner / Freelance Recruiter / Business Development**: Are you ready to take charge of your career with flexibility and autonomy? Join us as a **Business Partner or Freelance Recruiter / Business Development**to grow our **recruitment, marketing, and human resource consultancy business**! **Why Join Us?**: - **Flexible Working...


  • Singapore Twine Full time

    Join to apply for the Freelance Software Engineer role at Twine . This opportunity is ideal for a skilled freelance software engineer with a strong background in app, web, and AI/ML development. The project is in its early planning and research phase, focusing on transforming innovative ideas into a functional solution. The role is suited for those who...

  • Freelance Marketing

    1 week ago


    Singapore Twine Full time

    Join to apply for the Freelance Marketing role at Twine This role focuses on managing and optimizing pay-per-click (PPC) campaigns to drive online sales for a client. The position is remote and project-based, with the potential for additional work depending on performance and project outcomes. The ideal candidate will have a proven track record in PPC...

  • Freelance Designer

    1 week ago


    Singapore Twine Full time

    Join a dynamic project focused on creating engaging e-learning content using Articulate Storyline. This freelance opportunity is ideal for a junior designer eager to contribute to a single project with the possibility of ongoing collaboration. The role is fully remote, offering flexibility and the chance to work closely with a technical administrative team...

  • Account Manager

    7 days ago


    Singapore STAR CAREER CONSULTING PTE. LTD. Full time

    **Account Manager / Business Development Manager - Freelance** Our company is looking for Account Manager (Recruitment)/ Business Development Manager - Freelance. Incumbent can refer Government/ Enterprise Commercial Clients business who has staffing/ recruitment needs to the organisation both locally or regionally. **Requirements**: - **Strong Clientel...