Hire the best Web Application Security Freelancers in Ukraine

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$25 hourly
Serhiy S.
- 5.0/5
- (4 jobs)
“I know I can do more, and I'm already doing it” © Serhiy S. Hi, I'm Serhiy, an experienced web developer, specializing in various web solutions. I have more than 10 years of experience in web developing for business and government projects. I'm an expert in HTML, CSS, JavaScript, PHP, and MySQL. Along with web development I strive to deliver complete business solutions for my clients. My daily work is creating original software products with unique capabilities for regular usage by my customers in good terms. Working with me you will get the following top notch services: #1 Full stack development and commissioning of websites to serve thousands of visitors at a time. Creation of online stores, company web sites, landing pages, web applications, online services. Development of individual admin panels according to your personal needs. Complete development of the online school according to the needs of the customer. I understand and I can develop a working website using effects of 3D technology. #2 Connection via API of external payment systems, services and other applications. #3 Assist in correcting software code errors created by other persons, configuration of various software on Windows and on Ubuntu systems including servers. #4 I have experience in organizing people to work in a team. Reach out to me to get professional advice for your web development tasks. I will gladly provide a working and elegant solution for your business or startup. Thank you for reviewing my profile. Feel free to contact me to discuss your projects or ask any web development related questions. I look forward to successful and productive cooperation now and in future!

Web Application Security
Web Server
Web Content Development
Web Service
Web Hosting
phpMyAdmin
WebAPITesting
MySQL
Web Application
Web Development
HTML
PHP
CSS
JavaScript
HTML5
$15 hourly
Volodymyr V.
- 5.0/5
- (91 jobs)
Hello! I'm a QA Engineer from Ukraine with 20 years of experience in IT and 9 years specifically in QA and QA Team Leadership. My primary focus is manual testing, and I bring deep technical insight, attention to detail, and clear communication to every project. 🔍 Core QA Skills: Manual Testing of web, desktop, and mobile apps UI/UX Testing & usability evaluation API Testing using Postman Cross-platform testing with real devices and BrowserStack Game Testing for desktop & mobile (Unity, Android/iOS) Basic Security Testing using Kali Linux, Arachni, OWASP ZAP, Nessus, and OSINT tools Development of test plans, test cases, and bug reports 💡 Tools & Technologies I work with: QA Tools: TestRail, Testlink, Zeplin, Figma, Swagger Dev Tools: HTML/CSS, ADB, Xcode, Android Studio, WordPress Payment/API systems: Stripe, MongoDB Bug Trackers: JIRA, Asana, Redmine, YouTrack, Trello, Pivotal Tracker, Basecamp, Airtable, Wrike, Linear 👥 Leadership & Mentorship: As a QA Lead, I mentor junior QA engineers, manage test cycles, and control QA team processes to ensure efficient and scalable testing. 🎮 Specialization in Game Testing: I have extensive experience testing games across platforms, ensuring not only functionality but smooth performance and player experience. 💼 Industries I've worked in: Outsourcing Game Development Studios Fintech Startups Event and Entertainment Platforms ✅ I combine technical depth, team leadership, and high responsibility. I am always focused on bug-free releases, efficient communication, and client satisfaction. Let’s ensure your users experience a polished, reliable product — I’d be happy to help!

Web Application Security
Security Analysis
Security Testing
Information Security Consultation
Security Assessment & Testing
Software Testing
Network Administration
Information Security
Software QA
Test Case Design
Manual Testing
Functional Testing
Game Testing
$35 hourly
Nikita K.
- 5.0/5
- (9 jobs)
Do you know that by implementing better processes and minimizing technical debt, Full Stack Developers can help reduce the cost of feature delivery for your business by up to 30%? 🔥 I am Nikita, a Full Stack Developer with 7 years of expertise in building robust web applications. Specializing in Ruby on Rails, PHP (Laravel, Yii), and JavaScript (React), I understand the pain points faced by businesses in today's digital landscape. 𝐌𝐘 𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 𝐀𝐂𝐇𝐈𝐄𝐕𝐄𝐌𝐄𝐍𝐓𝐒 𝐀𝐑𝐄: 🚀 Achieved +850,000 Platform User Growth: Implemented strategies and enhancements that led to the remarkable growth of over 850,000 platform users, representing a significant increase of 30% within a specified timeframe. 🔥 Improved Business Flexibility and Control: Implemented robust tools and technologies that provided clients with increased flexibility in making business decisions. This resulted in a 40% improvement in control over tools and processes, empowering clients to make informed choices and adapt swiftly to market demands. 📈 Enhanced Autonomy: Developed and implemented features that empowered clients to have more autonomy in managing their platforms. By providing intuitive administrative tools, clients experienced a 25% increase in autonomy, allowing them to make modifications and customize the platform as per their requirements. 💰 Streamlined Feature Delivery and Cost Efficiency: Implemented efficient processes and optimized development workflows, resulting in a 30% reduction in feature delivery time and cost. By addressing technical debt and improving development practices, we successfully expedited feature deployment while reducing associated expenses. 📱 Improved Productivity and Time-to-Market: Introduced streamlined development practices and best coding standards, resulting in a 20% increase in development productivity and a 15% reduction in time-to-market. By eliminating unnecessary complexities and adopting efficient coding techniques, we accelerated the development cycle, ensuring the timely delivery of high-quality features. 𝐖𝐇𝐀𝐓 𝐌𝐘 𝐂𝐋𝐈𝐄𝐍𝐓𝐒 𝐒𝐀𝐘 𝐀𝐁𝐎𝐔𝐓 𝐌𝐄: ⭐ "I had the pleasure of working with Nikita on a healthcare software project, and I was highly impressed with his expertise and dedication. He demonstrated a deep understanding of the healthcare industry's unique challenges and requirements. Gotoinc's technical skills in Ruby, PHP, JavaScript, and React were exceptional, allowing them to develop robust and secure solutions. They effectively integrated various healthcare systems and ensured HIPAA compliance. Their professionalism, strong communication skills, and ability to work collaboratively made them valuable to our team" John Doe, CTO ⭐ ”Working with Nikita on an e-learning project was a remarkable experience. His team displayed a profound understanding of the e-learning domain and implemented cutting-edge technologies to create an exceptional platform. Nikita efficiently integrated multimedia content, interactive assessments, and user-tracking functionalities, resulting in a highly immersive and effective e-learning platform. Gotoinc team’s ability to deliver quick and cost-effective features, thanks to streamlined processes and reduced technical debt, was truly remarkable“ Smith Owen, Project Manager 𝐇𝐎𝐖 𝐓𝐇𝐄 𝐇𝐈𝐑𝐈𝐍𝐆 𝐏𝐑𝐎𝐂𝐄𝐒𝐒 𝐋𝐎𝐎𝐊𝐒 𝐋𝐈𝐊𝐄 There are two options for collaborating with Gotoinc: - 𝐓𝐚𝐥𝐞𝐧𝐭𝐬-𝐚𝐬-𝐚-𝐒𝐞𝐫𝐯𝐢𝐜𝐞 𝐦𝐨𝐝𝐞𝐥 a dedicated expert(-s) on a subscription basis. - 𝐏𝐫𝐨𝐣𝐞𝐜𝐭-𝐁𝐚𝐬𝐞𝐝 𝐂𝐨𝐥𝐥𝐚𝐛𝐨𝐫𝐚𝐭𝐢𝐨𝐧 𝐦𝐨𝐝𝐞𝐥 we deliver a certain scope or solution in a pre-defined timeline/budget. 𝐇𝐨𝐰 𝐭𝐨 𝐬𝐭𝐚𝐫𝐭: 1. Having an intro, where we identify your request 2. Our team identifies specific Talent or Team for your request 3. We deeply research your request and outline unique collaboration terms 4. Gotoinc presents your unique proposal and negotiates it with You 5. We sign a contract 6. We kick off our ongoing collaboration 💻 𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫: 👉 Skills: Full Stack Development, Web Application Development, Database Design, API Integration, Responsive Web Design, Code Optimization, Testing and Debugging 🛠️ Tools: Ruby (Rails, Puma, Rspec, Capybara, Rubocop, Sidekiq), PHP (Yii, Laravel), JavaScript (jQuery, React, CoffeeScript), HTML5, CSS3, SCSS, HAML, Git, MySQL, PostgreSQL, SQLite3, Redis, Apache, Nginx, TDD, BDD, Heroku, AWS S3, GraphQL, Stripe, Twilio, Zapier, ActiveCampaign, Salesforce 🆙 If you are interested in discussing your project with me, make sure to click the 👉🟢INVITE🟢 button, and let’s talk 🤝 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐞𝐝 𝐒𝐤𝐢𝐥𝐥𝐬: Full Stack Development, Ruby on Rails, PHP, JavaScript, HTML5/CSS3, Database Management, API Integration, Code Optimization, Testing and Debugging, Version Control (Git), Web Servers (Apache, Nginx), Development Approaches (TDD, BDD), Cloud Platforms and Services, Code Optimization Last updated: September, 2024

Web Application Security
Web Application
Security Infrastructure
Security Engineering
Software Integration
Software Development
SaaS Development
AWS Development
Front-End Development
Back-End Development
Full-Stack Development
Ruby on Rails
React
Ruby
JavaScript
$75 hourly
Maryna D.
- 5.0/5
- (2 jobs)
I have 8+ years in Security with a focus on Application Security. Have experience with Secure Development Lifecycle on each layer: providing recommendations to the application, implementing security controls in CI/CD (Jenkins), manual testing of application, regular testings implementation (SAST, DAST and SCA). Additional skills: Migration to the cloud; Implementing SSO and ADFS; AWS – have experience with multiple AWS products including all security products, API Gateway, CloudFront, CloudTrail, CloudHealth, and much more; Vulnerabilities and incident analyzing with OWASP, Burp, Nesus, Acunetix, KaliLinux tools, working with server and PC logs; Strong knowledge of OSI and TCP/IP model; IT Security governance: ISO 27001, ISO 27002, ITIL, GDPR; Hands-on experience with systems: DLP system; Proxy Server; Malware Analyzer; EMM solutions; SIEM McAfee; IT security methodology – write regular including best practices for Web developing, API and GraphQL developing, internal policies etc; Key management, PKI and SSL/TLS; Programing language: Python, SQL, Java, Node is, JavaScript, CSS, HTML. Hands-on experience with developers instruments like Swagger, Jenkins, Kubernetes, Docker, RunDeck, Git, etc; Strong knowledge about virtual infrastructure and containers; API management, API security.

Web Application Security
Cybersecurity Tool
Security Infrastructure
Security Analysis
AI Security
Application Security
Security Assessment & Testing
Secure SDLC
Web Application
Amazon Web Services
$35 hourly
Alexander M.
- 4.6/5
- (19 jobs)
Are you experiencing the adverse effects of slow web application performance on your revenue? Research reveals that even a mere one-second delay in page load time can lead to a 7% decline in conversions, negatively impacting your bottom line. As a Senior Full Stack developer with 7 years of experience specializing in Ruby on Rails and React, I deliver high-performance web applications while prioritizing data protection 𝐌𝐘 𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 𝐀𝐂𝐇𝐈𝐄𝐕𝐄𝐌𝐄𝐍𝐓𝐒 𝐈𝐍𝐂𝐋𝐔𝐃𝐄: 🚀 Improved Website Performance: Implemented optimization techniques resulting in a 30% decrease in page load time, enhancing user experience and reducing bounce rates 💼 Enhanced Conversion Rates: Developed and implemented a responsive design strategy that led to a 20% increase in conversion rates, driving higher sales and revenue generation for clients 🔒 Secured Data and Mitigated Risks: Implemented robust security measures resulting in a 95% reduction in potential vulnerabilities, ensuring the safety of sensitive customer data and minimizing the risk of data breaches 📈 Scalable Application Architecture: Designed and implemented a scalable architecture that allowed clients' applications to handle a 200% increase in user traffic, ensuring seamless performance during peak periods ⏱️ Streamlined Development Process: Introduced agile development methodologies, resulting in a 40% reduction in project turnaround time, allowing for faster delivery and increased client satisfaction 𝐖𝐇𝐀𝐓 𝐌𝐘 𝐂𝐋𝐈𝐄𝐍𝐓𝐒 𝐒𝐀𝐘 𝐀𝐁𝐎𝐔𝐓 𝐌𝐄: ⭐"We hired his team to build our SaaS platform from the ground up, and they delivered beyond our expectations. Their deep knowledge of RoR and front-end technologies enabled them to create a robust and scalable application architecture. They skillfully implemented complex user management systems and seamlessly integrated third-party APIs. I highly recommend the Gotoinc team for any SaaS development project!" John, CTO, SaaS development project ⭐"I had the pleasure of working with Alex as a Full Stack developer for our education technology startup. He played a pivotal role in transforming our vision into a fully functional platform. Gotoinc team’s expertise in RoR development, coupled with their deep understanding of the education sector, allowed them to build intuitive features and seamless user interfaces" Emily, Project Manager, e-learning project 𝐇𝐎𝐖 𝐓𝐇𝐄 𝐇𝐈𝐑𝐈𝐍𝐆 𝐏𝐑𝐎𝐂𝐄𝐒𝐒 𝐋𝐎𝐎𝐊𝐒 𝐋𝐈𝐊𝐄: There are two options for collaborating with Gotoinc: - 𝐓𝐚𝐥𝐞𝐧𝐭𝐬-𝐚𝐬-𝐚-𝐒𝐞𝐫𝐯𝐢𝐜𝐞 𝐦𝐨𝐝𝐞𝐥 a dedicated expert(-s) on a subscription basis. - 𝐏𝐫𝐨𝐣𝐞𝐜𝐭-𝐁𝐚𝐬𝐞𝐝 𝐂𝐨𝐥𝐥𝐚𝐛𝐨𝐫𝐚𝐭𝐢𝐨𝐧 𝐦𝐨𝐝𝐞𝐥 we deliver a certain scope or solution in a pre-defined timeline/budget. How to start: 1. Having an intro, where we identify your request 2. Our team identifies specific Talent or Team for your request 3. We deeply research your request and outline unique collaboration terms 4. Gotoinc presents your unique proposal and negotiates it with You 5. We sign a contract 6. We kick off our ongoing collaboration 👨‍💻 Languages: Ruby, HTML, CSS, JavaScript, SQL 🌐 Frameworks & Architectures: RoR framework, MVC architecture, RESTful APIs 🚀 Front-End: HTML5, CSS3, JavaScript, jQuery, Bootstrap, React.js 🛠️ Back-End: Ruby, ActiveRecord, PostgreSQL, MySQL, MongoDB 📚 Testing: RSpec, Capybara, Selenium, Pry, Byebug ⚙️ Deployment: Heroku, AWS, Git, GitHub, Bitbucket 🔒 Security: Web app security, authentication, authorization 🌍 APIs: RESTful APIs, third-party integration 📈 Optimization: Performance, caching, code optimization 🆙 If you are interested in discussing your project with me, make sure to click the 👉🟢INVITE🟢 button, and let’s talk 🤝 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐞𝐝 𝐒𝐤𝐢𝐥𝐥𝐬: Ruby, HTML, CSS, JavaScript, SQL, HTML5, CSS3, JavaScript, Bootstrap, React.js, PostgreSQL, MySQL, MongoDB, RSpec, Capybara, Selenium, Heroku, AWS, Git, Web app security, authentication, authorization, RESTful APIs, third-party integration, front-end development, VS Code, Git Last updated: February, 2025

Web Application Security
AWS Development
Web Application Firewall
Software Development
Security Engineering
Web Application Development
Back-End Development
React Bootstrap
React
Front-End Development
Full-Stack Development
Ruby on Rails
JavaScript
AngularJS
$75 hourly
Vasyl D.
- 5.0/5
- (9 jobs)
I have 10+ years in Security with a focus on Application Security. Worked in companies of different sizes and in different industries, so have experience with every cloud and multiple technology stacks. That's what I love in security - tasks are the same but environments are different in each projects, so you need to adopt your knowledges to new situation. Have experience with Secure Development Lifecycle on each layer: providing recommendations to the application, implementing security controls in CI/CD (Jenkins), manual testing of application, regular testings implementation (SAST, DAST and SCA). Additional skills: Migration to the cloud; Implementing SSO and ADFS; AWS – have experience with multiple AWS products including all security products, API Gateway, CloudFront, CloudTrail, CloudHealth, and much more; Vulnerabilities and incident analyzing with OWASP, Burp, Nesus, Acunetix, KaliLinux tools, working with server and PC logs; Strong knowledge of OSI and TCP/IP model; IT Security governance: ISO 27001, ISO 27002, ITIL, GDPR; Hands-on experience with systems: DLP system; Proxy Server; Malware Analyzer; EMM solutions; SIEM McAfee; IT security methodology – write regular including best practices for Web developing, API and GraphQL developing, internal policies etc; Key management, PKI and SSL/TLS; Programing language: Python, SQL, Java, Node is, JavaScript, CSS, HTML. Hands-on experience with developers instruments like Swagger, Jenkins, Kubernetes, Docker, RunDeck, Git, etc; Strong knowledge about virtual infrastructure and containers; API management, API security.

Web Application Security
Security Infrastructure
Web App Penetration Testing
GDPR
Web Testing
Information Security Audit
Amazon Web Services
OWASP
Application Security
Cybersecurity Management
Information Security Consultation
Penetration Testing
Vulnerability Assessment
$20 hourly
Petro M.
- 5.0/5
- (1 job)
Hi there! I am the guy who makes things done. You define a problem and I deliver you high quality and secure code. For 9+ years I am working as a software developer. My passion is frontend development with React and React Native. I have also gathered a considerable experience in the backend world: NodeJS, Go and Python. I am fluent in English and German. I completed bachelor degree in computer science. I will be able to contribute to a project on any stage of development. Please let me know if I can help. Best regards, Petro

Web Application Security
Selenium
Next.js
CI/CD
NoSQL Database
React Native
Redux
GraphQL
SQL
Django
JavaScript
React
Node.js
TypeScript
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