KTalk (Main Platform) - Language Learning Platform

Professional Work

• Built 22+ dashboard sections for Admin, Tutor, and Student roles.

• Developed class, student, tutor, payment, subscription, inquiry, forum, promotion, textbook, Calendly, applicant, and language-centre management features.

• Implemented PayPal payment and subscription flows with 28-day billing cycles, auto-renewal, discount tiers, and conditional UI.

• Built media gallery functionality with CRUD operations and category filtering.

• Developed blog management with SSR and slug-based routing for SEO-friendly blog pages.

• Built community features including post comments and search.

• Developed applicant and enrollment forms with validation and Google reCAPTCHA.

• Built tutor profiles with multiple file uploads and nationality selection.

• Implemented sorting and filtering across class, student, and tutor management tables.

• Integrated Zoom links into class details and built inquiry functionality for admin and teacher panels.

• Built the complete certificate management system, including creation, editing, publishing, revocation, and verification.

• Implemented certificate request workflows from tutor request → admin approval → automatic generation.

• Built PDF certificate generation with QR codes and public certificate verification.

• Contributed to backend development using NestJS during the monorepo phase.

1. Complex Payment & Subscription Logic

Challenge: PayPal subscriptions required 28-day billing cycles, auto-renewal, discount tiers, and different UI states depending on subscription status.

Solution: Iteratively refined payment conditional rendering, PayPal button visibility, subscription end-date logic, and auto-renewal messaging.

2. Role-Based Dashboards

Challenge: Admin, Tutor, and Student users required completely different dashboards, permissions, and workflows.

Solution: Built role-specific dashboard components with conditional routing and access control across 22+ dashboard sections.

3. A Certificate Is a Document Someone Else Has to Trust

Challenge: A certificate is not a database row a student reads back on their own dashboard — it leaves the platform as a PDF and is shown to an employer or a school that has no account. Three things have to hold at once: it must be generated the same way every time, it must be verifiable by someone outside the system, and it must be revocable after it has been issued and sent.

Solution: Built the lifecycle around that — a tutor requests, an admin approves, generation is automatic rather than hand-assembled, and each certificate carries a QR code resolving to a public verification page keyed by a token in the URL path. Revocation flips the verification result rather than deleting anything, so an old PDF still resolves and now says so.

Result: A document a third party can check without an account, and an issuer who can withdraw one after it has left the building.

4. Scheduling Across Timezones

Challenge: A class has one true start time, but a student in Seoul, a tutor in Manila, and an administrator in Dhaka must each see it correctly in their own local time — and a subscription renewing on a fixed cycle must not drift when it crosses that boundary. Getting this wrong produces no error, only a student who misses a class.

Solution: Class times are stored once and rendered in the viewer's local zone.

Result: The same class reads correctly to all three roles without a second source of truth.

5. SSR for Blog Pages

Challenge: Blog detail pages needed server-side rendering for SEO while maintaining slug-based URLs.

Solution: Converted blog detail pages to SSR and implemented slug-based routing.