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Hi, I'm Ignas Kubilius, a Senior Full Stack Engineer with 10+ years of experience building scalable web applications across finance, e-commerce, and fintech. I specialize in Python (Django, Flask, FastAPI) for backend and React/Next.js/React Native for frontend, with strong experience in microservices, cloud platforms (AWS, Azure), and DevOps (CI/CD, Docker, Kubernetes). I enjoy collaborating with cross-functional teams to deliver user-centric applications, optimize performance, and explore AI and blockchain technologies to enhance security and efficiency.…Hi, I'm Ignas Kubilius, a Senior Full Stack Engineer with 10+ years of experience building scalable web applications across finance, e-commerce, and fintech. I specialize in Python (Django, Flask, FastAPI) for backend and React/Next.js/React Native for frontend, with strong experience in microservices, cloud platforms (AWS, Azure), and DevOps (CI/CD, Docker, Kubernetes). I enjoy collaborating with cross-functional teams to deliver user-centric applications, optimize performance, and explore AI and blockchain technologies to enhance security and efficiency.

Ignas Kubilius

Full Stack Developer, Web Developer, Front-End Developer, +2

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Hi, I'm Ignas Kubilius, a Senior Full Stack Engineer with 10+ years of experience building scalable web applications across finance, e-commerce, and fintech. I specialize in Python (Django, Flask, FastAPI) for backend and React/Next.js/React Native for frontend, with strong experience in microservices, cloud platforms (AWS, Azure), and DevOps (CI/CD, Docker, Kubernetes). I enjoy collaborating with cross-functional teams to deliver user-centric applications, optimize performance, and explore AI and blockchain technologies to enhance security and efficiency.…Hi, I'm Ignas Kubilius, a Senior Full Stack Engineer with 10+ years of experience building scalable web applications across finance, e-commerce, and fintech. I specialize in Python (Django, Flask, FastAPI) for backend and React/Next.js/React Native for frontend, with strong experience in microservices, cloud platforms (AWS, Azure), and DevOps (CI/CD, Docker, Kubernetes). I enjoy collaborating with cross-functional teams to deliver user-centric applications, optimize performance, and explore AI and blockchain technologies to enhance security and efficiency.

Available to hire

Hi, I’m Ignas Kubilius, a Senior Full Stack Engineer with 10+ years of experience building scalable web applications across finance, e-commerce, and fintech. I specialize in Python (Django, Flask, FastAPI) for backend and React/Next.js/React Native for frontend, with strong experience in microservices, cloud platforms (AWS, Azure), and DevOps (CI/CD, Docker, Kubernetes).

I enjoy collaborating with cross-functional teams to deliver user-centric applications, optimize performance, and explore AI and blockchain technologies to enhance security and efficiency.

Skills

Experience Level

Expert

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Work Experience

Sr. Full Stack Engineer at Barclays

May 1, 2023 - Present

Led the design and implementation of a customer-facing financial dashboard using React and Next.js, delivering real-time data visualization and improving user engagement and retention. Built RESTful APIs with Python (Django, FastAPI) and ensured secure, high-performance communication between frontend and backend. Migrated to a microservices architecture to enhance scalability and availability. Collaborated with data science teams to integrate ML-based fraud detection, reducing fraudulent transactions. Optimized AWS infrastructure (EC2, Lambda, S3, RDS) to cut costs by ~40%. Implemented CI/CD pipelines with GitHub Actions and Jenkins, achieving faster deployments. Mentored junior developers and explored blockchain-based transaction verification to boost security.

Full Stack Engineer at Relai

April 1, 2020 - May 1, 2023

Developed a secure payment gateway enabling users to buy Bitcoin with multiple payment methods, boosting transaction volume by 40%. Built backend services with FastAPI and Django, reducing processing times and improving reliability. Implemented real-time transaction monitoring using WebSockets with a responsive frontend. Established automated CI/CD with CircleCI and AWS-based cloud infrastructure, increasing uptime and deployment efficiency. Led end-to-end testing initiatives with Jest and Cypress to achieve high test coverage and reduce production issues. Integrated React Native for mobile support to improve performance and stability.

Full Stack Engineer at Barbora

July 1, 2018 - March 1, 2020

Designed and developed an integrated shopping cart with real-time order tracking using React.js and Redux, significantly boosting conversion rates. Implemented responsive UI/UX improvements, leading to higher mobile traffic and satisfaction. Built microservices for inventory and order management, improving order fulfillment times. Collaborated on UI/UX with Figma and integrated real-time error tracking with Sentry to enhance reliability. Optimized backend services with FastAPI to handle peak traffic, and led a mobile app initiative using React Native to improve performance.

Web Developer at SoftTeco

July 1, 2014 - August 1, 2018

Led development of responsive web applications using React.js, aligning with design teams to implement UI/UX improvements and mobile-first patterns. Integrated frontend with Django/Flask backends to improve system performance. Contributed to design systems with Figma, reducing feature development time and ensuring consistency. Implemented error tracking with Sentry and established unit/integration testing, improving code quality and reliability.