You will get 🔐 Professional fix for authentication bugs (JWT, OAuth, Firebase, Auth0)
Project details
Why choose my service to solve authentication bugs?
🔒 Pure focus: I specialize only in authentication—the heartbeat of every app—so your issue becomes my top priority.
⚠️ Critical access point: Auth bugs block users, hurt revenue, and cause frustration. They need a fast, definitive fix.
🧠 Expertise that counts: I master JWT, OAuth2, session persistence, and protection against XSS, CSRF, and token misuse.
🚀 Solo and swift: No team delays. I replicate, explain, and fix the bug myself, with clear docs, tested on web and mobile.
💼 Trusted by startups: When time is tight and stakes are high, companies rely on me to solve what others can’t.
Authentication is all I do—and I do it fast, securely, and with real-world experience.
🔒 Pure focus: I specialize only in authentication—the heartbeat of every app—so your issue becomes my top priority.
⚠️ Critical access point: Auth bugs block users, hurt revenue, and cause frustration. They need a fast, definitive fix.
🧠 Expertise that counts: I master JWT, OAuth2, session persistence, and protection against XSS, CSRF, and token misuse.
🚀 Solo and swift: No team delays. I replicate, explain, and fix the bug myself, with clear docs, tested on web and mobile.
💼 Trusted by startups: When time is tight and stakes are high, companies rely on me to solve what others can’t.
Authentication is all I do—and I do it fast, securely, and with real-world experience.
Testing Platform
Website Testing, Mobile Testing, Software TestingDevice
PC, Mac, LinuxLanguage
English, French, ItalianWhat's included
| Service Tiers |
Starter
$90
|
Standard
$150
|
Advanced
$250
|
|---|---|---|---|
| Delivery Time | 1 day | 2 days | 3 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages Tested | 1 | 2 | 3 |
Screen Recording Time (Minutes) | 5 | 10 | 15 |
Test Scenario | - | - | - |
Summary Report | - | - | - |
Annotated Screenshots | - | - | - |
Test Desktop | - | - | - |
Test Mobile | - | - | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$50 - $80
Additional Revision
+$20
Additional Page Tested
(+ 1 Day)
+$30
Test Scenario
(+ 2 Days)
+$40Frequently asked questions
About Nerlin
Full-stack Authentication Specialist & Microservices
Chivasso, Italy - 10:23 pm local time
Ciao!
Sono un Backend Developer specializzato in architetture a microservizi e in sistemi di autenticazione sicura.
Il mio stack principale include Node.js NestJS/NextJS/Tailwind css/React, con PostgreSQL/MongoDB e Redis per la gestione dei dati e delle sessioni. Implemento sistemi robusti di autenticazione e autorizzazione usando JWT e OAuth2.0, MFA (2FA), Passport,seguendo sempre le best practices in termini di sicurezza.
Mi concentro molto sulla qualità del codice: uso ESLint, Husky, Joi e Jest per validazioni, linting e test Unitari, automatizzati e test e2e. Questo mi permette di scrivere codice pulito, scalabile e facile da manutenere.
Sono disponibile per collaborazioni sia su progetti già avviati che per sviluppi da zero. Se cerchi affidabilità, chiarezza e orientamento al risultato, sarò felice di contribuire al successo del tuo progetto!
A presto,
Nerlin Makaya Nsimba
Steps for completing your project
After purchasing the project, send requirements so Nerlin can start the project.
Delivery time starts when Nerlin receives requirements from you.
Nerlin works on your project following the steps below.
Revisions may occur after the delivery date.
Initial analysis
I examine the files, logs, and environment to understand the context and reproduce the bug exactly.
Isolating the problem
Identify the cause: token management, session, cookie, OAuth, or cross-platform conflicts.