I am a Full Stack Developer with over 8 years of experience designing, developing, and maintaining complex web applications. I specialize in backend technologies like PHP (Laravel, Symfony), REST and GraphQL APIs, as well as frontend frameworks such as Angular and Vue.js. I have a strong focus on building scalable integrations and improving software infrastructure, including CI/CD pipelines and Docker environments. Throughout my career, I've contributed to significant product growth and delivered multiple third-party integrations across ecommerce, logistics, and payment platforms. I'm passionate about crafting flexible, maintainable software solutions and leveraging modern Cloud and DevOps tools to optimize development workflows and deployment processes.

Costin Lemnaru

I am a Full Stack Developer with over 8 years of experience designing, developing, and maintaining complex web applications. I specialize in backend technologies like PHP (Laravel, Symfony), REST and GraphQL APIs, as well as frontend frameworks such as Angular and Vue.js. I have a strong focus on building scalable integrations and improving software infrastructure, including CI/CD pipelines and Docker environments. Throughout my career, I've contributed to significant product growth and delivered multiple third-party integrations across ecommerce, logistics, and payment platforms. I'm passionate about crafting flexible, maintainable software solutions and leveraging modern Cloud and DevOps tools to optimize development workflows and deployment processes.

Available to hire

I am a Full Stack Developer with over 8 years of experience designing, developing, and maintaining complex web applications. I specialize in backend technologies like PHP (Laravel, Symfony), REST and GraphQL APIs, as well as frontend frameworks such as Angular and Vue.js. I have a strong focus on building scalable integrations and improving software infrastructure, including CI/CD pipelines and Docker environments.

Throughout my career, I’ve contributed to significant product growth and delivered multiple third-party integrations across ecommerce, logistics, and payment platforms. I’m passionate about crafting flexible, maintainable software solutions and leveraging modern Cloud and DevOps tools to optimize development workflows and deployment processes.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
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Language

Romanian, Moldavian, Moldovan
Fluent
English
Advanced

Work Experience

Full Stack Developer at Frisbo
November 1, 2019 - Present
Architected and delivered scalable integrations between multiple e-commerce platforms, warehouse management systems, couriers, and invoicing tools to automate logistics and inventory workflows. Introduced standardized integration interfaces and a unified notification system for real-time order updates. Enhanced observability and maintainability with improved logging and error handling; ensured integration stability via automated PHPUnit tests. Contributed to infrastructure improvements using Docker and CI/CD pipelines. Supported the client-facing Angular dashboard with CRUD features and built internal monitoring tools with Node.js & Vue. Key achievements include delivering 20+ API integrations, designing a native event-driven notification system, reducing maintenance complexity, and contributing to platform growth from $1M to $4M ARR.
Full Stack Developer - Part-time at Amparcat
April 30, 2024 - July 25, 2025
Implemented backend logic and REST APIs for subscriptions, toll purchases, and a configurable campaign & rewards engine to enable dynamic user benefits and marketing promotions. Integrated external services to provide deals, rewards, and automated subscription renewals. Developed secure external payment integrations with asynchronous callbacks and data consistency checks. Customized and extended Sonata Admin for backend entity management. Wrote Behat tests to validate key backend flows and ensured stability. Used Docker for local development and deployment automation. Delivered multiple third-party integrations and built a flexible campaign and rewards system allowing non-technical staff to dynamically define criteria and benefits.
Web Developer at RGT Cycling
November 30, 2019 - July 25, 2025
Developed a statistics and analytics dashboard to track user retention, engagement, and in-game behavior. Optimized database queries and data aggregation using ORM and custom SQL. Built interactive data visualizations in Vue.js accessible to non-technical users. Developed Laravel backend services for processing and exposing analytics data with optimized queries. Integrated Laravel backend APIs into a modular frontend and used Docker for development and deployment. Created a flexible reporting system enabling user filtering and segmentation, improved dashboard load times, and ensured scalability for large analytics datasets.
Web Developer at High Contrast
October 31, 2018 - July 25, 2025
Developed custom WordPress websites for HR campaigns, reporting platforms, and informational portals. Created fully customized frontend layouts using HTML5, CSS3/SASS, and JavaScript without relying on frameworks. Implemented advanced animations and visual effects with Tweenmax.js, Raphael.js, and CSS3 glitch effects. Integrated external APIs such as OpenStreetMap and Algolia, optimizing Ajax-based navigation for improved user experience. Ensured cross-browser compatibility, responsive design, and performance optimization. Achievements included redesigning the Blog F64 platform, delivering a customized responsive design recognized on Awwwards, and improving interactivity and load times through dynamic content loading.
Full Stack Developer at Frisbo
November 1, 2019 - Present
Architected and delivered scalable integrations between e-commerce platforms, warehouse management systems, couriers, and invoicing tools, ensuring seamless data flow. Introduced standardized integration interfaces and a unified notification system for real-time order lifecycle updates. Enhanced observability and maintainability of integrations with improved logging, diagnostics, and error handling. Ensured integration stability with automated PHPUnit test coverage. Contributed to infrastructure improvements including Dockerized environments and CI/CD pipelines. Supported client-facing Angular dashboard with CRUD functionalities and built internal monitoring tools in Node.js & Vue. Key achievements include delivering 20+ API integrations enabling automated fulfillment workflows, designing a native event-driven notification system, and contributing to the platform's growth from $1M to $4M ARR.
Full Stack Developer - Part-time at Amparcat
April 30, 2024 - July 25, 2025
Implemented backend logic and REST APIs for subscriptions, toll purchases, and a configurable campaign & rewards engine, enabling dynamic user benefits and marketing promotions. Integrated external services to provide deals, rewards, and automated subscription renewals. Implemented secure external payment integrations with asynchronous callbacks and data consistency checks. Customized and extended Sonata Admin to manage backend entities and campaign rewards. Wrote Behat tests to ensure backend flow stability. Used Docker for local development and deployment automation. Delivered multiple third-party integrations and built a flexible campaign and rewards system allowing non-technical staff to define user criteria and benefits dynamically.
Web Developer at RGT Cycling
November 30, 2019 - July 25, 2025
Developed a statistics and analytics dashboard to track user retention, engagement, and in-game behaviors. Optimized database queries combining ORM and custom SQL for better performance. Built interactive data visualizations in Vue.js to make metrics accessible for non-technical users. Developed Laravel backend services to process and expose analytics data with optimized queries. Integrated Laravel-based backend APIs into a modular front-end. Used Docker for local development and containerized deployments. Achievements include creating a flexible reporting system with user segmentation and improving dashboard load times for large datasets.
Web developer at High Contrast
October 31, 2018 - July 25, 2025
Developed custom WordPress websites for HR campaigns, reporting platforms, and informational portals. Built fully customized front-end layouts with HTML5, CSS3/SASS, and JavaScript. Implemented advanced animations and visual effects using Tweenmax.js, Raphael.js, and CSS3 glitch effects. Integrated external APIs and optimized Ajax-based navigation. Ensured cross-browser compatibility, responsive design, and performance optimization. Achievements include redesigning Blog F64 facilitating complex content migration, creating a responsive design recognized with Honorable Mention on Awwwards, and improving interactivity with dynamic navigation for Fundatii Comunitare.
Full Stack Developer at Frisbo
November 1, 2019 - Present
Architected and delivered scalable integrations between e-commerce platforms, warehouse management systems, couriers, and invoicing tools, ensuring seamless data flow for orders, inventory, and delivery statuses. Introduced standardized integration interfaces and a unified notification system enabling real-time order lifecycle updates via webhooks. Enhanced observability and maintainability of integrations with improved logging, diagnostics, and error handling. Ensured integration stability and backward compatibility through automated PHPUnit test coverage. Contributed to infrastructure improvements including Dockerized environments and CI/CD pipelines. Supported client-facing Angular dashboard with CRUD functionalities for orders, products, and warehouses, built internal monitoring tools using Node.js and Vue. Delivered 20+ API integrations enabling automated fulfillment workflows for hundreds of stores. Designed an event-driven notification system for order lifecycle events, reducing
Full Stack Developer - Part-time at Amparcat
April 30, 2024 - July 26, 2025
Implemented backend logic and REST APIs for subscriptions, toll purchases, and a configurable campaign & rewards engine enabling dynamic user benefits and marketing promotions. Integrated external services for deals, rewards, and automated subscription renewals based on user activity. Built secure external payment integrations with asynchronous callbacks and data consistency checks. Customized and extended Sonata Admin to manage backend entities, user criteria, and campaign rewards. Wrote Behat tests to validate key backend flows and ensure stability. Used Docker for local development and deployment automation. Delivered multiple third-party integrations expanding app ecosystem and monetization. Built a flexible campaign and rewards system that allowed non-technical staff to define criteria and benefits dynamically.
Web Developer at RGT Cycling
November 30, 2019 - July 26, 2025
Developed a statistics and analytics dashboard to track user retention, engagement, and in-game behaviors. Optimized database queries and data aggregation by combining ORM and custom SQL for enhanced performance. Built interactive data visualizations in Vue.js to make metrics accessible to non-technical users. Developed Laravel backend services for analytics data processing and exposure, implemented optimized queries for structured metrics. Integrated backend APIs into modular frontend structure. Used Docker for local development and containerized deployments. Created a flexible reporting system with filtering and segmentation of users based on retention cohorts, activity frequency, and gameplay patterns. Improved dashboard load times and ensured scalability for large analytics datasets.
Web developer at High Contrast
October 31, 2018 - July 26, 2025
Developed custom WordPress websites for HR campaigns, reporting platforms, and informational portals. Built fully customized front-end layouts using HTML5, CSS3/SASS, and JavaScript without relying on standard frameworks. Implemented advanced animations and visual effects using Tweenmax.js, Raphael.js, and CSS3 glitch effects. Integrated external APIs such as OpenStreetMap and Algolia and optimized Ajax-based navigation enhancing user experience. Ensured cross-browser compatibility, responsive design, and performance optimization. Delivered several key projects including redesigning and rebuilding complex blogs, creating highly customized responsive designs recognized by awards, and enhancing interactivity through dynamic content loading.
Full-Stack Developer at Zamora.ai
May 1, 2025 - Present
Configured, secured, and optimized a VPS environment using Docker and Nginx as a reverse proxy and web server. Built a headless CMS with Strapi for dynamic content management. Developed interactive Next.js components fetching content via GraphQL. Set up CI/CD pipelines with GitHub Actions including Bash scripting for deployment automation.
Full Stack Developer at Frisbo
November 1, 2019 - Present
Architected and delivered scalable integrations between e-commerce platforms, warehouses, couriers, and invoicing systems to automate logistics and inventory workflows. Introduced standardized integration interfaces and a unified notification system with real-time updates via webhooks. Enhanced observability and maintainability through improved logging, diagnostics, and error handling. Ensured integration stability with automated PHPUnit test coverage. Contributed to infrastructure improvements with Dockerized environments and CI/CD pipelines. Supported client-facing Angular dashboard and created internal monitoring tools in Node.js and Vue. Delivered 20+ API integrations and scaled platform growth from $1M to $4M ARR.
Full Stack Developer - Part-time at Amparcat
April 30, 2024 - July 26, 2025
Implemented backend logic and REST APIs for subscriptions, toll purchases, and a configurable campaign and rewards engine. Integrated external services for deals, rewards, and subscription renewals. Developed secure external payment integrations with asynchronous callbacks, confirmation handling, and data consistency checks. Customized and extended Sonata Admin for backend management. Wrote Behat tests for backend stability. Used Docker for development and deployment. Delivered multiple third-party integrations and developed a flexible campaign and rewards system for non-technical staff.
Web Developer at RGT Cycling
November 30, 2019 - July 26, 2025
Developed statistics and analytics dashboards to track user retention and engagement. Optimized database queries combining ORM and custom SQL. Built interactive data visualizations in Vue.js. Developed Laravel backend services processing analytics data and exposing APIs for frontend dashboards. Integrated backend APIs into modular frontend structure. Used Docker for development and deployments. Created a flexible reporting system with advanced filtering and segmentation, improving dashboard load times and scalability.
Web developer at High Contrast
October 31, 2018 - July 26, 2025
Developed custom WordPress websites for HR campaigns, reporting platforms, and informational portals. Built fully customized front-end layouts without relying on standard frameworks. Implemented advanced animations and visual effects using Tweenmax.js, Raphael.js, and CSS3 glitch effects. Integrated external APIs and optimized Ajax-based navigation. Ensured cross-browser compatibility, responsive design, and performance optimization. Key projects included redesigning the Blog F64, creating a responsive design with CSS3 glitch animations recognized by Awwwards, and improving interactivity with dynamic Ajax navigation.
Full-Stack Developer at Zamora.ai
May 1, 2025 - Present
Configured, secured, and optimized a VPS environment deploying services with Docker and using Nginx as reverse proxy and web server. Built a headless CMS with Strapi for dynamic content management. Implemented interactive Next.js components with content fetched via GraphQL. Set up CI/CD pipelines with GitHub Actions including Bash scripting for deployment automation.
Full Stack Developer at Frisbo
November 1, 2019 - Present
Architected and delivered scalable integrations between e-commerce platforms, warehouse management systems, couriers, and invoicing tools, ensuring seamless data flow for orders, inventory, and delivery statuses. Introduced standardized integration interfaces and a unified notification system for real-time order lifecycle updates via webhooks. Enhanced observability and maintainability of integrations through improved logging, diagnostics, and error handling, and ensured integration stability using automated PHPUnit test coverage. Contributed to infrastructure improvements including Dockerized environments and CI/CD pipelines. Supported the client-facing Angular dashboard with CRUD functionalities and built internal monitoring tools in Node.js & Vue. Delivered 20+ API integrations enabling automated fulfillment workflows for hundreds of stores and contributed to the platform’s growth from $1M to $4M ARR.
Full Stack Developer - Part-time at Amparcat
April 30, 2024 - July 26, 2025
Implemented backend logic and REST APIs for subscriptions, toll purchases, and a configurable campaign & rewards engine. Integrated external services to provide deals and automated subscription renewals. Implemented secure external payment integrations with asynchronous callbacks and data consistency checks. Customized and extended Sonata Admin to manage backend entities, user criteria, and campaign rewards. Wrote Behat tests to validate key backend flows and used Docker for local development and deployment automation. Delivered multiple third-party integrations extending the app’s ecosystem and built a flexible campaign and rewards system for non-technical staff.
Web Developer at RGT Cycling
November 30, 2019 - July 26, 2025
Developed a statistics and analytics dashboard to track user retention, engagement, and in-game behaviors. Optimized database queries and data aggregation for better performance. Built interactive data visualizations in Vue.js and developed Laravel backend services to process and expose analytics data. Integrated Laravel-based backend APIs into a modular frontend structure. Used Docker for local development and containerized deployments. Created a flexible reporting system enabling filtering and segmentation of users and optimized dashboard load times and scalability.
Web Developer at High Contrast
October 31, 2018 - July 26, 2025
Developed custom WordPress websites for HR campaigns, reporting platforms, and informational portals. Built fully customized front-end layouts with HTML5, CSS3/SASS, and JavaScript without relying on standard frameworks. Implemented advanced animations and visual effects using Tweenmax.js, Raphael.js, and CSS3. Integrated external APIs like OpenStreetMap and Algolia and optimized Ajax-based navigation. Ensured cross-browser compatibility, responsive design, and performance optimization. Key achievements include rebuilding the Blog F64, creating a highly customized responsive design recognized on Awwwards, and improving interactivity and reducing page load times with dynamic Ajax and API-driven content loading.
Full Stack Developer at Frisbo
November 1, 2019 - Present
Architected and delivered scalable integrations between ecommerce platforms, warehouse management systems, couriers, and invoicing tools to automate logistics workflows. Developed a native event-driven notification system for real-time order lifecycle updates via webhooks. Enhanced observability, logging, and error handling for client-facing services and ensured integration stability through automated PHPUnit tests. Contributed to Dockerized environments and CI/CD pipelines and supported an Angular dashboard with CRUD functionalities and internal monitoring tools built in Node.js and Vue.js. Successfully delivered over 20 API integrations and played a key role in scaling the platform from $1M to $4M ARR.
Full Stack Developer (Part-time) at Amparcat
April 30, 2024 - August 22, 2025
Implemented backend logic and REST APIs for subscriptions, toll purchases, and a configurable campaign & rewards engine. Integrated external services for automated subscription renewals and implemented secure payment integrations with asynchronous callbacks. Customized Sonata Admin backend to manage entities and campaigns. Wrote behavioral tests to ensure stability using Behat and used Docker for development and deployment automation. Delivered multiple third-party integrations expanding the app's monetization and built a flexible campaign management system for non-technical staff.
Web Developer at RGT Cycling
November 30, 2019 - August 22, 2025
Developed a statistics and analytics dashboard tracking user retention, engagement, and in-game behaviors. Optimized database queries and data aggregation combining ORM and custom SQL for performance improvements. Built interactive data visualizations in Vue.js and developed Laravel backend services to expose analytics data with optimized API responses. Used Docker for local development and containerized deployments.
Web Developer at High Contrast
October 31, 2018 - August 22, 2025
Developed custom WordPress websites for HR campaigns, reporting platforms, and informational portals. Built fully customized front-end layouts with HTML5, CSS3 (SASS), and JavaScript. Implemented advanced animations and visual effects using Tweenmax.js, Raphael.js, and CSS3 glitch effects. Integrated external APIs like OpenStreetMap and Algolia and optimized Ajax navigation. Delivered responsive design and performance optimization. Notable projects included redesigning the Blog F64 and the awarded Move to Brașov site with CSS3 glitch animations.
Full Stack Developer (Volunteer) at Zamora.ai
May 1, 2025 - Present
Configured, secured, and optimized a VPS environment deploying services with Docker and using Nginx as reverse proxy and web server. Built and deployed a headless CMS with Strapi (Node.js) for dynamic content management. Implemented interactive Next.js components fetching content via REST API from Strapi. Set up CI/CD pipelines with GitHub Actions including Bash scripting for deployment automation.

Education

Bachelor's Degree in Economic Informatics at Faculty of Economics and Business Administration (FSEGA), Babeș-Bolyai University
July 1, 2025 - August 22, 2025
Linux System Administration at Zero To Mastery Academy
April 1, 2025 - June 30, 2025
Web Development Training at Avantaj Consulting
June 1, 2016 - December 30, 2016

Qualifications

Linux System Administration
May 1, 2025 - June 30, 2025
Web Development
November 1, 2016 - December 30, 2016
Linux System Administration
May 1, 2025 - June 30, 2025
Web Development
November 1, 2016 - December 30, 2016
Linux System Administration
May 1, 2025 - June 30, 2025
Web Development
November 1, 2016 - December 30, 2016
Linux System Administration
May 1, 2025 - June 30, 2025
Web Development
November 1, 2016 - December 30, 2016
Linux System Administration
May 1, 2025 - June 30, 2025
Web Development
November 1, 2016 - December 30, 2016
Linux System Administration
April 1, 2025 - June 30, 2025
Web Development Training
June 1, 2016 - December 30, 2016

Industry Experience

Software & Internet, Retail, Transportation & Logistics, Gaming, Professional Services, Media & Entertainment, Wholesale & Distribution, Financial Services, Non-Profit Organization