Gerdas Retys

Gerdas Retys Senior Full-Stack Developer Kaunas, Lithuania •-• LinkedIn SUMMARY Senior Full Stack Engineer with 11 years of experience in full-stack web development across FinTech, Banking, eCommerce, Enterprise, and Healthcare domains. Expert in building RESTful and GraphQL APIs with Node.js (Express, NestJS, Koa) and integrating databases such as MongoDB, PostgreSQL, and Redis using ORMs like Mongoose, Sequelize, and TypeORM. Skilled in modern frontend development using React.js, TypeScript, Redux, Zustand, and Tailwind CSS, with hands-on experience in server-side rendering (SSR), static site generation (SSG), and API routes via Next.js. Proficient in secure authentication mechanisms (JWT, OAuth) and advanced state management. Strong DevOps knowledge with Docker, GitHub Actions, GitLab CI/CD, and Jenkins for end-to-end deployment pipelines. Capable of delivering production-ready SaaS platforms, admin dashboards, and real-time systems with comprehensive test coverage using Jest, Supertest, Cypress, and Playwright. Comfortable in Agile environments using Jira, Trello, and Notion. SKILLS           Programming Languages: HTML, CSS/Sass/SCSS, JavaScript, TypeScript, Go, Java, Kotlin Core Stack Skills: React.js, React Native, Redux, MobX, Next.js, Node.js, Express.js, NestJS, Koa, Gin, Echo, Fiber, Echo, Spring Boot API Development: REST APIs, GraphQL, API versioning, error handling, rate limiting Cloud/Hosting: AWS (EC2, S3), GCP, Azure, DigitalOcean, Vercel, Netlify, Railway Database: PostgreSQL, MySQL, MongoDB, MariaDB, Oracle, MSSQL, DynamoDB, Redis, ORMs: Mongoose, TypeORM, Sequelize, GORM Testing: Jest, Supertest, React Testing Library, Enzyme, Mocha, Chai, Cypress, Playwright DevOps, CI/CD: GitHub Actions, GitLab CI/CD, Bitbucket Pipelines, Jenkins, Docker Compose Agile: Jira, Trello, Notion Boards, Agile/Scrum (sprints, standups, retrospectives) Version Control: Git, GitHub, GitLab WORK EXPERIENCE Jun 2022 – Apr 2025 Spearheaded the development of a full-cycle custom medicine delivery app for a US healthcare client, integrating patient, pharmacist, and admin interfaces into a seamless digital ecosystem. Engineered a mobile-first experience using Flutter for iOS and Android, ensuring smooth UX for prescription uploads, order tracking, and payment. Developed secure backend APIs with Node.js and MongoDB, ensuring HIPAA-compliant data handling and real-time order management. Implemented pharmacist-side web portal with advanced features like real-time order dashboard, prescription validation, and delivery tracking. Integrated an AI-powered medicine suggestion engine to offer safer and faster alternatives for patient prescriptions. Coordinated a cross-functional team to deliver the MVP within tight deadlines, resulting in a 70% improvement in the client’s medicine delivery operations. Contributed to automated prescription processing logic and ensured accurate integration with eprescription systems. Senior Full-Stack Engineer, GlobalCraft                        Designed and developed a scalable DSaaS platform integrating AI/ML models to forecast material shipment dates, resulting in a 45% reduction in disrupted deliveries and a 630% decrease in production halt risks. Built data pipelines and predictive analytics using TypeScript, Node.js (NestJS), and PostgreSQL, enabling continuous ingestion and transformation of procurement and vendor data. Created an intuitive web interface with React, Next.js, MobX, and MUI to visualize supply chain health and predictive insights for operational managers. Collaborated closely with ML engineers to implement cohort-based model clustering, custom resampling for data drift mitigation, and explainability features for enhanced user trust in AI outputs. Leveraged frameworks like TensorFlow, Keras, PyTorch, and Scikit-learn to develop and monitor machine learning workflows with MLflow and AutoML techniques. Followed Agile Scrum practices with bi-weekly sprints, ensuring tight coordination with the client and adaptability to evolving requirements. Supported cross-functional teams including PMs, BAs, UI/UX designers, and QA engineers to deliver a reliable, production-grade supply chain forecasting solution. Developed a customizable white-label crowdfunding platform enabling farmers to attract donations and investments to support sustainable land greening and environmental initiatives. Implemented blockchain-based token payment system for secure, instant donations, integrated with user wallets for transparent tracking of contributions. Built an interactive web platform with JavaScript, React, Node.js (NestJS), and MongoDB. Designed for high adaptability with white-label features allowing client-specific branding and use across multiple industries. Conducted thorough QA including automated Cypress tests to ensure stability and security, particularly around payment flows. Followed Agile Scrum methodology with close client collaboration, iterative demos, and JIRAbased task tracking. Delivered a full-cycle solution—from discovery and prototyping to launch and ongoing support— within 18 months. Achieved significant impact: €50,000 invested within the first two months and 50 land plots greened, fostering sustainable agriculture and promoting eco-friendly investment. Platform scalability enables future expansion into other sectors beyond agriculture, enhancing client’s product portfolio. Feb 2019 – May 2022 Delivered a suite of custom SAP Fiori applications integrated into the SAP Fiori Launchpad to enhance materials management, procurement, supplier evaluation, and inventory oversight within a leading automotive manufacturing enterprise. Addressed gaps in the SAP S/4HANA default modules by building agile, tile-based apps that provide actionable insights, real-time KPIs, and detailed operational overviews, improving decision-making and responsiveness across procurement and supply chain teams. Technologies and tools: SAPUI5, JavaScript, jQuery, Node.js, ABAP, SAP CDS, SAP BOPF, OData/REST services, SAP S/4HANA ERP, and SAP Fiori framework. Employed Agile Scrum methodology with bi-weekly sprints, iterative prototyping, and close collaboration with stakeholders, ensuring alignment with business goals and operational needs. Conducted workshops and interviews to identify client pain points and business requirements, followed by wireframing and prototyping for early feedback. Provided training and ongoing support post-deployment to ensure smooth adoption and continuous improvement of the applications. Achieved a 21% increase in procurement accuracy by reducing expired contracts and overdue orders. Reduced supply disruption risk by 2.3 times through enhanced supplier evaluation and inventory management. Senior Full-Stack Engineer, Baltic Amadeus                     Significantly improved operational efficiency and responsiveness in procurement and supply chain processes. Modernized and enhanced a diverse ecosystem of web applications for a leading Nordic digital media group operating across Denmark, Norway, Sweden, and Finland, covering lifestyle, entertainment, health, and current affairs. Led migration to Labrador headless CMS, improving content management flexibility, multi-region and multilingual support, and consistent cross-platform content delivery. Developed and integrated a text-to-image generative AI solution using StableDiffusionXL and GPT-3.5, enabling automatic generation of high-quality images from text prompts, eliminating reliance on costly professional photography, reducing content production costs by 66%. Implemented an AI-driven personalized content recommendation system combining collaborative filtering, deep learning models, and hybrid algorithms to analyze user behavior, preferences, and interactions for tailored content delivery, boosting user engagement and retention. Delivered modernization across multiple digital media verticals, including interior design, motherhood, lifestyle, and show business, ensuring enhanced visual appeal, usability, and performance. Utilized cutting-edge technologies: React, Next.js, TypeScript, Node.js, Python, PyTorch, Keras, Hugging Face transformers, NVIDIA TensorRT, OpenAI GPT-3.5 API, Docker, AWS, Cloudflare, and Vercel. Followed Agile Scrum methodology with two-week sprints, incorporating rapid prototyping, user story mapping, customer journey analysis, and continuous client feedback for iterative improvements. Collaborated closely with cross-functional teams including UI/UX designers, ML developers, cloud engineers, and product owners to ensure seamless delivery and adoption. Achieved a 66% reduction in professional photography costs through AI-generated visuals. Increased monthly visitors by 12% thanks to more relevant, personalized content experiences. Enhanced platform usability and consistency, addressing navigation, SEO, content discrepancies, and speed issues. Jul 2016 – Jan 2019 Designed and developed a comprehensive farm management software automating livestock feed management, crop monitoring, and fleet operations, significantly enhancing operational efficiency and cost-effectiveness. Built a feed management module enabling precise tracking and control of feed ingredients, recipes, and feeding schedules, which resulted in a 37% reduction in feed waste and improved livestock health and weight gain. Developed an IoT-driven crop management system that integrated and visualized multiple agronomic data layers—including soil composition, moisture levels, crop health indicators, and satellite imagery—to support data-driven decision-making, leading to a 15% increase in crop yields. Implemented a fleet management module featuring real-time machine health monitoring, tracking engine temperature, oil pressure, and fuel levels, with proactive alerting mechanisms that extended machinery lifespan by 25% and minimized downtime. Leveraged IoT protocols such as MQTT, CANBUS, ISOBUS, and NTRIP to enable real-time data collection and transmission from sensors and farming equipment, ensuring seamless integration with cloud infrastructure built on AWS. Collaborated closely with agronomists, farm managers, and hardware teams to gather requirements, iterate on functionality, and deliver a scalable platform that aligned with operational needs and enhanced user experience. Ensured high data integrity and synchronization across multiple farm locations using a cloudbased architecture supporting real-time updates and analytics. Participated in Agile development cycles with bi-weekly sprints, regular demos, and close client communication to ensure timely delivery and continuous improvements. Full-Stack Engineer, logics7 Ltd                   Provided ongoing maintenance and support post-deployment, implementing feature updates and security enhancements to maintain system performance and reliability. Upgraded and enhanced an interactive in-video collaboration widget integrated into educational videos, significantly increasing learner engagement on the platform. Developed and implemented a comment moderation system allowing instructors to manage user comments with features like publish, dismiss, reply (public and private), and delete, maintaining a positive and relevant discussion environment. Integrated a personal notes feature enabling users to attach private notes and bookmarks directly to specific video timestamps, enriching the personalized learning experience. Rewrote the widget’s core logic to ensure seamless integration with Moodle LMS, improving system stability and compatibility with existing client infrastructure. Designed and implemented a new evaluation system tracking video consumption and quiz responses to better assess learner performance and engagement. Incorporated advanced analytics tools to monitor user engagement across courses, identifying difficult modules and content areas requiring further attention. Participated in Agile development cycles with daily standups, backlog grooming, and sprint planning, using Jira to track progress and quickly adapt to evolving client requirements. Provided ongoing maintenance, promptly resolving bugs after each User Acceptance Testing (UAT) phase to ensure a smooth, reliable user experience. Collaborated closely with the client to map out a strategic AI-powered personalization roadmap aimed at tailoring user interactions based on video engagement patterns and learning behaviors. Oct 2014 – Jun 2016 Developed a comprehensive, user-friendly stock trading app for iOS and Android, enabling novice investors to open brokerage accounts, execute trades, manage portfolios, and access real-time market analytics. Streamlined the account registration and verification process, incorporating electronic signing of regulatory forms such as W8 and FATCA/CRS within the app for a seamless onboarding experience. Implemented security features, including two-factor authentication (2FA) and biometric login (fingerprint and facial recognition) to safeguard user accounts. Built key modules for deposits, withdrawals, and instant money transfers using multiple payment methods such as credit/debit cards, wire transfers, and e-wallets. Integrated a built-in calendar feature notifying users of dividend payments, bond coupon issuances, and allowing setup of regular investment funding schedules. Developed portfolio management functionalities allowing users to view, categorize, and evaluate assets across multiple currencies and asset classes. Created smart asset filtering tools for securities sorting by identifiers, industry, volatility, and other criteria, improving investment decision-making. Delivered real-time market data feeds with continuous updates on prices, volumes, and technical charts through integrations with MetaStock and TradingView. Incorporated transaction history tracking and margin trading features, enabling users to trade on leverage and monitor their activity effectively. Enabled personalized notifications for account activities, price alerts, and relevant financial news through multiple integrated news feeds and robo-advisor tools. Full-Stack Engineer, The3rd One Group           EDUCATION Bachelor’s Degree in Computer Science University of East London 2010 – 2014