Looking for a PHP developer (MySQL, security, auditing, vulnerability fixes)

PHP, Cybersecurity & Data Protection — incorrectly specified categories?

603 USD

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Looking for a PHP developer (MySQL, security, auditing, vulnerability fixes)

There is a project on pure PHP without frameworks, a codebase inherited, many holes and workarounds. There is enough work for 1–2 months in a tight schedule, afterwards — for maintenance (freelance, part-time).

What needs to be done:

Analyze and tidy up the existing legacy code.
Close vulnerabilities (there are a lot of SQL injections).
Rewrite queries to prepared statements (mysqli/PDO), remove unsafe escaping.
Check and fix XSS, CSRF, authorization, and sessions.
Establish minimal order: code structure, clear functions, documentation.
Set up server security: permissions, monitoring, alerts to bots.

Current stack:

Pure PHP (without a framework).
MySQL.
Linux server

What is required from you:

Deep experience in PHP (clean code, mysqli/PDO) and MySQL.
Ability to quickly understand someone else's legacy.
Understanding of OWASP Top 10: SQLi, XSS, CSRF, session management.
Experience working with servers (Apache/Nginx, permissions, basic security).
Ability not just to write code, but to make it secure and verify.

Will be a plus:

Experience with Git (even simple, without CI/CD).
Testing skills: at least simple unit tests or scripts for re-testing vulnerabilities.
Knowledge of security testing tools.

Format:

The first 1-2 months — full-time, then — support.
Remote, time zone does not matter, the main thing is deadlines and results.
Payment is negotiable, but critically — quality and responsibility.

How we will check:

I will give a small code fragment: you need to rewrite it to prepared statements and remove SQLi/XSS.
If you do it correctly — we move on.

Important:

If you are lazy or work "just to get by" — do not waste time.
If you really know PHP/MySQL and can close vulnerabilities — there will be a lot of work.

Proposals 6

Vyacheslav Yudin

7 1

Projects 6
Rating -
Rating 410

Budget: 27000 UAH Deadline: 30 days

Hello,

Thank you for the detailed description, I would be happy to help with the implementation of the project. I am a Software Development Engineer with over 7 years of experience in creating various websites, SaaS solutions, complex web platforms, and MVPs for startups. In my portfolio, I have highlighted some of the projects I have developed.

My stack includes the following technologies and their frameworks: PHP (Yii2, Laravel, Symfony), HTML5, CSS3, JS (Vue.js, React.js), MySQL, PostgreSQL.

Artur Klimenko

21 0

Budget: 27000 UAH Deadline: 20 days

Hello 👋! I am a highly qualified web developer with over ✅ 7 years of experience in backend development and modern web technologies. I work with New Construction Corporation Uzhgorod, Remax, Land Rover, Crazy Price Carpets, Confidence CRM, Butam Lt. My stack includes:

✅ Frontend: HTML, CSS, JavaScript, React.js, Vue.js, Angular
✅ Backend: PHP, Laravel, CodeIgniter, Python, Django, Flask, Node.js, Next, Nuxt
✅ CMS: WordPress(Woo), Prestashop, Shopify, OpenCart, BugCommerce
✅ Databases: MySQL, PostgreSQL
✅ Other skills: Git, API integration

Recent projects:
✔️ https://jashantoor.com/ ✔️ https://novobudova.pro
✔️ https://stxtrade.com/
✔️ https://boostylabs.com
✔️ https://confidence-tech.com
✔️ https://diamond-firms.com
✔️ https://confidence-crm.com
✔️ https://louca360marketing.com
✔️ https://salehub2b.eu
✔️ https://books.youeasystart.com
✔️ https://ukrfix.com
✔️ https://sweet-sdpearls.de/
✔️ https://lottobingom.com/categories/hot
✔️ https://aquahub.org.ua
✔️ https://boostylabs.com
✔️ https://ol.zp.ua
✔️ https://smt-industry.com
✔️ https://butams.com
✔️ https://emporio-sports.cz

Why choose me?
✔️ Fast and quality execution: Your tasks will be completed on time with impeccable quality.
✔️ API integration: Need seamless integrations of third-party APIs? I’ve got you covered.
✔️ Custom solutions: I take your ideas and turn them into successful web solutions tailored to your business needs.

Let’s collaborate and create something amazing together!

Nikolay Nikolay
Velikie Korovintsy, Ukraine
Private Organization

Projects 8
Rating -
Rating 221

Looking for a PHP developer (MySQL, security, auditing, vulnerability fixes)