Hi, i'm Kostadin Keljtanoski

Led the design, development, and implementation of a custom web application for Roof Right Now, a project aimed at empowering administrators, state admins, and subcontractors to manage workflows effectively across multiple regions. This end-to-end solution was developed from scratch, showcasing expertise in backend development, frontend integration, and third-party service integration.

• Planned and architected the application's database, ensuring scalability and optimal performance to support multi-state operations and hierarchical user roles.
• Designed the data model to accommodate complex relationships between admins, state admins, and subcontractors, ensuring efficient data retrieval and management.

• Built and maintained robust RESTful APIs to facilitate seamless communication between the frontend and backend systems.
• Implemented APIs with high reliability and security, supporting multi-user role-based access control.

• Designed and developed a comprehensive Admin Dashboard, enabling administrators to manage application entities effortlessly.
• Included features for assigning tasks, monitoring project progress, and overseeing subcontractor activities.

• Integrated Dropbox API to enable shared file uploads, allowing subcontractors to upload photos of completed work in stages directly into the assigned state admin’s Dropbox folder.
• Designed a custom wrapper for Dropbox services, streamlining file uploads, ensuring data security, and enhancing user experience.

• Adopted Service-Oriented Architecture (SOA) principles, writing modular, maintainable, and reusable code to support future enhancements and scalability.

• Leveraged modern full-stack tools, frameworks, and languages to deliver a high-quality solution.
• Followed clean coding standards and SOLID principles, ensuring maintainable and extensible code.

This project demonstrated my ability to lead the development lifecycle from inception to delivery, addressing both technical and operational requirements while providing a user-friendly solution tailored to a real-world business. The platform enabled streamlined workflows, enhanced collaboration, and improved oversight for administrators and subcontractors across multiple states.

Spearheaded the design, development, and deployment of a comprehensive software solution for MOKE, a company specializing in the rental of electric vehicles. This project was built entirely from scratch, encompassing backend architecture, frontend interfaces, and third-party service integrations to create a seamless user and admin experience.

• Designed and implemented the database schema and architecture to support vehicle rental operations, including user management, vehicle availability, and rental history tracking.
• Ensured the system could handle real-time data for vehicle geolocation and availability across multiple locations.

• Developed a complex RESTful API using Laravel, facilitating mobile app functionality, including QR code scanning for vehicle rentals, payment processing, and geolocation tracking.
• Integrated Stripe for secure payment processing, ensuring a smooth and reliable transaction experience for users.
• Incorporated a third-party service to provide customers with real-time information about nearby electric vehicle charging stations.

• Created a custom Admin Dashboard to enable efficient management of the rental fleet, pricing structures, and real-time tracking of rented vehicles.
• Included features for generating rental quotes, managing vehicle maintenance schedules, and tracking vehicle status and locations.

• Designed and developed a responsive Vue.js website, offering users an intuitive platform to browse available vehicles, book rentals, and manage their accounts.
• Implemented features similar to the mobile app, such as searching for vehicles, viewing rental quotes, and completing bookings.

• Delivered backend support for a mobile app that allowed users to rent vehicles by scanning QR codes directly on the vehicles, streamlining the rental process.
• Enabled real-time vehicle tracking and geolocation to enhance the user experience.

• Followed SOA principles, writing modular, maintainable, and reusable code for core functionalities.

This project showcased my ability to deliver a full-stack solution tailored to the needs of a dynamic and customer-focused business. By integrating cutting-edge technologies and user-friendly designs, the platform enabled efficient management of electric vehicle rentals while providing a seamless and engaging experience for users through both the web and mobile interfaces.

As a Senior PHP Developer, I was responsible for architecting, developing, and maintaining scalable and efficient backend services, with a strong focus on Service-Oriented Architecture (SOA). This role involved the design and implementation of RESTful APIs, database schema development, and the integration of third-party services, ensuring robust, modular, and maintainable codebases.

• Designed and developed a comprehensive Customer and Billing Management Service to handle key business processes, including customer onboarding, billing, and transaction management.
• Implemented seamless integration with a remote Payment Factory Service for generating Payment Provider Objects during payment processing. This ensured consistent and reliable communication between services, enabling smooth transaction handling for merchants, customers, and clients.
• Built a flexible and extensible architecture to accommodate the addition of new payment providers and billing features without disrupting existing workflows.

• Developed the Payment Factory Service, a core component designed to dynamically instantiate payment providers based on incoming requests from remote services.
• Ensured scalability by designing the system to support multiple payment provider integrations, offering flexibility for future expansion.
• Utilized modular design patterns to streamline the addition and maintenance of payment providers, reducing development and integration time.

• Created highly performant and secure RESTful APIs to facilitate inter-service communication and external integrations.
• Implemented error-handling mechanisms and response standardization, ensuring reliability and consistency across API interactions.

• Architected and optimized the database structure to support complex relationships and high-volume transaction processing.
• Applied best practices for indexing, query optimization, and normalization to ensure scalability and performance.

• Built custom wrappers for integrating third-party solutions, abstracting complexity and providing a unified interface for core business services.

• Followed SOLID principles and industry best practices to ensure code modularity, maintainability, and reusability across projects.
• Adhered to Service-Oriented Architecture (SOA), allowing for the independent deployment and scalability of individual service components.

This role allowed me to refine my expertise in payment systems, API design, and scalable architecture, while delivering critical business services that supported transaction reliability, customer satisfaction, and operational efficiency.

As the Lead Developer for the Internal Management System (ALEX), I managed the development, enhancement, and maintenance of a comprehensive platform integrating CRM, EPM, HRM, and ICT Management functionalities. This role required full SDLC participation, close collaboration with stakeholders, and leadership in planning and execution.

• Worked with the Product Owner and Project Manager to translate business requirements into technical deliverables.
• Participated in sprint planning, task prioritization, and resource allocation to ensure timely and efficient development.
• Conducted code reviews to maintain high coding standards and performed rigorous testing to ensure functionality and robustness.

• Designed and implemented scalable features for the Internal Laravel Framework and refactored legacy code to improve performance.
• Authored and maintained detailed Confluence documentation to support internal knowledge sharing.

• Developed custom API client packages for external integrations, including N-Central for device management and Microsoft Azure/Office 365 for IT services.
• Architected APIs for mobile telephony overviews and secure order processing with comprehensive OAuth authentication and documentation.

• Two-Factor Authentication (2FA): Created a custom Laravel package to enhance system security.
• Roles & Permissions: Implemented a granular access control system for frontend and backend users.
• Device & Client Management: Built modules for managing clients, organizations, and IT devices.

• Invoicing Module: Developed a high-volume invoicing solution to ensure accuracy and efficiency.
• SFTP Client Module: Automated secure file transfers by processing XML and JSON formats for seamless order integration.

This role demonstrated my ability to lead complex projects, apply technical expertise, and deliver scalable, secure systems that streamlined operations and improved efficiency.

As the Lead Project Developer for the ZeroPlex Laravel Team at Xessable, I was responsible for guiding and mentoring a team of Laravel developers, overseeing day-to-day development tasks, and ensuring the successful delivery of high-quality software solutions. This role involved a combination of leadership, technical expertise, and proactive problem-solving to drive team performance and project outcomes.

• Guided and mentored the internal Laravel development team, fostering a culture of collaboration and continuous learning.
• Provided hands-on support to team members, resolving technical challenges and offering feedback to improve code quality and efficiency.
• Conducted regular knowledge-sharing sessions to keep the team updated on best practices, new Laravel features, and emerging industry trends.

• Managed and created daily deliverables and task assignments for the dedicated internal project and the Laravel team.
• Conducted detailed task estimations to support sprint planning and align project timelines with business goals.
• Developed comprehensive project reports to communicate progress, blockers, and achievements to stakeholders.

• Executed thorough code reviews to ensure adherence to coding standards, maintain consistency, and identify areas for optimization.
• Established and enforced best practices for testing, ensuring robust and reliable software.
• Played an active role in debugging and troubleshooting issues to minimize downtime and improve application stability.

• Identified and implemented process improvements to enhance team productivity and streamline development workflows.
• Worked closely with cross-functional teams to address project requirements and ensure alignment with client expectations.

This role allowed me to demonstrate strong leadership and technical expertise, delivering scalable, high-quality solutions while empowering the development team to excel in their roles. My contributions not only ensured project success but also elevated team performance and efficiency through mentorship and process optimization.

As a Magento 1 & 2 CE/EE Developer and Team Lead, I spearheaded the development of a Magento 2 project for one of the largest independent distributors of electronic components. Leading a team of three developers, I ensured the delivery of high-quality, scalable e-commerce solutions while fostering a collaborative and efficient development environment.

• Developed custom modules, widgets, and plugins tailored to meet client-specific requirements for Magento 2 Enterprise Edition (EE).
• Updated and created components for the Magento 2 theme, enhancing user interface design and functionality.
• Implemented performance optimizations, including improving the loading speed of the Product Detail Page (PDP).
• Designed and developed reusable components, such as a custom widget for listing categories with images.
• Catalog Category Link Widget: Enhanced version of the core widget for streamlined navigation.
• Recently Sold Products Widget: Configurable from the admin panel to display recently sold products from a selected category using an options array.

• Collaborated with a remote DevOps team, assisting in the creation and troubleshooting of Docker scripts to set up and maintain the project environment.
• Authored comprehensive documentation for implemented features and widgets, shared on Confluence for knowledge transfer and process transparency.

• Converted provided designs into custom Magento 1 themes, ensuring pixel-perfect implementation and alignment with client branding.
• Established a robust LESS structure and organized theme files following best practices for improved workflow and maintainability.
• Integrated and configured Grunt Task Runner to enhance the development workflow, streamlining tasks such as compiling LESS, minifying files, and optimizing performance.

• Delivered tailored e-commerce solutions that enhanced the client’s operational efficiency and improved end- user experience.
• Enabled a faster and more efficient workflow through reusable components and optimized development practices.
• Fostered a productive team environment, successfully guiding developers to meet project goals and deadlines while adhering to high coding standards.

This role showcased my ability to lead a team, solve complex technical challenges, and deliver innovative e-commerce solutions in a fast-paced environment. My contributions improved system performance, usability, and maintainability, aligning with both client needs and industry standards.

As a Full Stack PHP Developer, I designed, developed, and maintained solutions using Drupal 7 & 8, WordPress, and Laravel 4/5, transforming business requirements into actionable user stories. This role involved architecting complex systems and ensuring high performance, scalability, and user-friendly interfaces.

• Developed web solutions in Drupal and PHP within a LAMP environment for reliability and scalability.
• Architected enterprise Drupal solutions, focusing on data, display, and information workflows.
• Utilized modules like CTools, Views, and Panels for advanced site-building, tailored to project needs.
• Created custom Drupal modules to expand system capabilities.
• Built responsive websites with Drupal CMS, HTML/HTML5, CSS/CSS3, and JavaScript/jQuery, incorporating Bootstrap for theming.
• Integrated Drupal Commerce, including payment gateways like Ingenico Payment, to enhance e-commerce functionality.
• Synchronized CRM (Odoo) with Drupal 7 for seamless data management and improved client interaction.
• Designed UI/UX components, updating admin themes and dashboards for a more intuitive experience.

• Developed custom CRUD functionality for front-end users, role-specific access, and permissions.
• Added sub-user functionality, enabling role-specific management with CRUD operations.
• Built admin theme option controllers for better customization.
• Implemented export to CSV with custom queries and detailed reports for administrators.
• Created a custom event creation system, improving planning and publication processes.

• Enhanced and implemented new features in Laravel 4/5 and WordPress, optimizing integration and performance.
• Developed an appointment scheduling system for patients and psychologists, enabling video call bookings and availability checks.
• Built a custom Admin Dashboard for psychologists to view patient numbers, revenue, and published content.
• Included tools for updating profiles, publishing news, and tracking metrics.

• Delivered scalable, tailored web applications that enhanced client satisfaction and operational efficiency.
• Optimized e-commerce platforms with seamless payment gateway integration and CRM synchronization.
• Designed user-friendly admin dashboards and interfaces, streamlining management processes.

This role highlighted my expertise in creating robust PHP-based solutions, delivering high-quality, user-focused applications, and meeting complex project demands effectively.

In this role, I contributed as a Full Stack PHP Developer, Web Designer, and Project Manager, handling end-to-end project execution, from custom web design and front-end development to backend architecture and project management. I played a key role in delivering scalable web solutions, ensuring responsive designs and high-quality results tailored to client specifications.

• Designed user-centric web interfaces, ensuring visual appeal and alignment with client branding.
• Transformed PSD designs into responsive websites using HTML, CSS, Bootstrap, JavaScript, and jQuery.
• Implemented mobile-first designs with Bootstrap, ensuring cross-device compatibility.
• Integrated HubSpot forms to streamline lead generation and enhance client marketing.

• Developed custom PHP/MySQL projects using the company’s internal CMS framework.
• Designed efficient MySQL schemas to optimize database performance and security.
• Built dynamic, data-driven websites and custom content management systems for clients.

• Created custom WordPress themes, tailoring design and functionality to meet client needs.
• Developed and customized WordPress plugins for SEO, e-commerce, and user management.
• Resolved issues in existing WordPress sites, improving performance and scalability.
• Managed WordPress migrations and upgrades, ensuring minimal downtime.

• Managed the entire project lifecycle, from initial consultation to post-launch support.
• Translated client requirements into actionable tasks, ensuring alignment with business goals.
• Collaborated with designers, developers, and stakeholders to meet deadlines and budgets.
• Conducted progress reviews, identified risks, and implemented solutions to ensure timely delivery.
• Maintained detailed documentation, reporting project status to stakeholders.

• Delivered visually engaging, functional, and responsive websites, boosting client engagement.
• Streamlined development workflows by optimizing the use of the internal CMS framework.
• Fostered strong client relationships through consistent delivery of high-quality, tailored solutions.
• Successfully managed part-time and full-time roles, ensuring continuous project progress.

This role demonstrated my ability to manage diverse responsibilities, combining technical expertise, creative design, and effective project management to deliver impactful web solutions.