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Hi, I'm Mattias Sepp, a Senior Python Full Stack Engineer with over 7 years of experience building scalable, high-performance web applications. I specialize in Python, Microservices, and front-end frameworks like React and Angular. Whether working with startups or large corporations, I enjoy leading projects from conception to deployment, optimizing cloud infrastructure, and mentoring junior developers. I’m passionate about AI and LLMs, integrating them into practical solutions such as personalized recommendations and natural language search. I thrive in collaborative, agile environments and am always eager to learn new technologies to deliver efficient, innovative solutions.…Hi, I'm Mattias Sepp, a Senior Python Full Stack Engineer with over 7 years of experience building scalable, high-performance web applications. I specialize in Python, Microservices, and front-end frameworks like React and Angular. Whether working with startups or large corporations, I enjoy leading projects from conception to deployment, optimizing cloud infrastructure, and mentoring junior developers. I’m passionate about AI and LLMs, integrating them into practical solutions such as personalized recommendations and natural language search. I thrive in collaborative, agile environments and am always eager to learn new technologies to deliver efficient, innovative solutions.

Mattias Sepp

Full Stack Developer, Developer, AI Engineer, +2

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Hi, I'm Mattias Sepp, a Senior Python Full Stack Engineer with over 7 years of experience building scalable, high-performance web applications. I specialize in Python, Microservices, and front-end frameworks like React and Angular. Whether working with startups or large corporations, I enjoy leading projects from conception to deployment, optimizing cloud infrastructure, and mentoring junior developers. I’m passionate about AI and LLMs, integrating them into practical solutions such as personalized recommendations and natural language search. I thrive in collaborative, agile environments and am always eager to learn new technologies to deliver efficient, innovative solutions.…Hi, I'm Mattias Sepp, a Senior Python Full Stack Engineer with over 7 years of experience building scalable, high-performance web applications. I specialize in Python, Microservices, and front-end frameworks like React and Angular. Whether working with startups or large corporations, I enjoy leading projects from conception to deployment, optimizing cloud infrastructure, and mentoring junior developers. I’m passionate about AI and LLMs, integrating them into practical solutions such as personalized recommendations and natural language search. I thrive in collaborative, agile environments and am always eager to learn new technologies to deliver efficient, innovative solutions.

Available to hire

Hi, I’m Mattias Sepp, a Senior Python Full Stack Engineer with over 7 years of experience building scalable, high-performance web applications. I specialize in Python, Microservices, and front-end frameworks like React and Angular. Whether working with startups or large corporations, I enjoy leading projects from conception to deployment, optimizing cloud infrastructure, and mentoring junior developers.

I’m passionate about AI and LLMs, integrating them into practical solutions such as personalized recommendations and natural language search. I thrive in collaborative, agile environments and am always eager to learn new technologies to deliver efficient, innovative solutions.

Skills

Experience Level

Expert

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Intermediate

Work Experience

Sr. Full Stack Engineer at SimpleNursing

December 31, 2024 - July 28, 2025

Designed and developed a high-performance, user-friendly E-commerce web application using Python, Microservices, and React, which increased customer engagement by 20%. Implemented performance optimization strategies including Elasticsearch, Redis, multi-threading, significantly reducing response times. Created and maintained RESTful APIs and user interfaces for a trading system, personalized product recommendations with embeddings-based similarity search, and automated customer support with LLMs. Enhanced natural language search using large language models for intent recognition. Improved code quality and reduced post-deployment issues by 30% through comprehensive testing. Managed containerized deployments with Docker and Kubernetes, and set up CI/CD pipelines using Jenkins and Bitbucket. Led a team of six, collaborated cross-functionally, mentored junior developers, and worked as DevOps on AWS infrastructure.

Sr. Full Stack Engineer at Ambiscale

November 30, 2022 - July 28, 2025

Developed scalable SaaS web applications using Python Flask/FastAPI, Node.js for back-end, and Angular for front-end. Designed and managed relational and NoSQL databases, optimized application performance using caching solutions like Redis and Memcached, and conducted code profiling and testing to ensure reliability. Led migration of enterprise applications improving scalability and reliability. Implemented NLP pipelines to extract medical terms from clinical notes. Used AWS services such as EC2, SNS, RDS, Elastic Beanstalk, and Lambda for deployment and management. Collaborated with cross-functional teams to enhance operational efficiency in banking projects. Utilized Angular 9 reactive forms with integrated validation and Angular Material components for UI enhancement.

Full Stack Engineer at Light in Global

January 31, 2018 - July 28, 2025

Led server-side development using Python/Django leveraging MVC architecture for robust back-end services and security features. Engineered microservices architecture with Netflix Eureka for service discovery and Ribbon for client load balancing to enhance scalability and resilience. Managed cloud solutions on GCP, utilizing Compute Engine, Kubernetes Engine, and Cloud Storage. Designed microservices with Docker and Kubernetes for horizontal scaling and fault tolerance. Proficient in ORM, SQL tuning, and transaction management with MySQL and MongoDB. Developed RESTful APIs with Django REST and SOAP web services for integration. Orchestrated CI/CD pipelines using CircleCI and Maven with Git version control in Agile environments.

Sr. Full Stack Engineer at SimpleNursing

December 31, 2024 - July 28, 2025

Designed and developed a high-performance e-commerce web application using Python, Microservices, and React, improving customer engagement by 20%. Implemented performance optimizations through Elasticsearch, Redis, multithreading, and memory management reducing response times. Developed and maintained RESTful APIs and user interfaces, enabling seamless front-end interactions. Personalized product recommendations and customer support automation using LLMs. Enhanced natural language search capabilities using LLMs. Applied rigorous testing strategies reducing post-deployment issues by 30%. Managed containerized applications with Docker and Kubernetes and set up CI/CD pipelines with Jenkins and Bitbucket. Hosted and tested applications in AWS cloud environment. Led a team of six, collaborated cross-functionally to architect a scalable trading system and mentored junior developers.

Sr. Full Stack Engineer at Ambiscale

November 30, 2022 - July 28, 2025

Built scalable SaaS web applications using Python (Flask/FastAPI), Node.js, and Angular. Designed and managed relational and NoSQL databases to optimize performance. Tuned application performance and implemented caching using Redis and Memcached. Led migration to improve scalability and system reliability. Developed NLP pipelines for extracting key medical terms from clinical notes. Utilized AWS services including EC2, SNS, RDS, Elastic Beanstalk, and Lambda for deployment and management. Enhanced user interfaces with Angular 9 and Angular Material components. Collaborated with interdisciplinary teams to optimize operational efficiency in the banking sector.

Full Stack Engineer at Light in Global

January 31, 2018 - July 28, 2025

Developed server-side applications using Python and Django with robust authentication and authorization. Engineered microservices architecture using Django and Netflix Eureka for service discovery. Managed cloud-based solutions on Google Cloud Platform including Compute Engine and Kubernetes Engine to scale applications. Designed microservices architecture with Docker and Kubernetes ensuring fault tolerance and horizontal scaling. Proficient in ORM, SQL tuning, and transaction management for MySQL and MongoDB. Created RESTful APIs and SOAP web services for seamless system integration. Orchestrated CI/CD pipelines using CircleCI and Maven in agile environments with Git version control.

Sr. Full Stack Engineer at SimpleNursing

December 31, 2024 - July 28, 2025

Designed and developed a high-performance, user-friendly E-commerce web application utilizing Python, Microservices, React, ensuring efficient communication between each microservice, leading to a 20% increase in customer engagement. Implemented performance optimization strategies like Elasticsearch, Redis, and multi-threading to improve response times and efficiency. Created and maintained RESTful APIs and user interfaces with React and RxJS to enable seamless front-end interactions within the trading system. Personalized product recommendations using user behavior data and embeddings-based similarity search. Enhanced natural language search with LLMs to understand user intent. Employed rigorous testing strategies reducing post-deployment issues by 30%. Managed containerized applications using Docker and Kubernetes, setup CI/CD pipelines via Jenkins and Bitbucket. Hosted and tested applications on AWS cloud infrastructure. Led a team of six, collaborating cross-functionally to build a

Sr. Full Stack Engineer at Ambiscale

November 30, 2022 - July 28, 2025

Built scalable SaaS web applications using Python, Flask/FastAPI, Node.js backend and Angular frontend. Managed relational and NoSQL databases optimizing data models and queries for performance. Tuned application performance with caching solutions Redis and Memcached alongside comprehensive testing. Led enterprise-level migration improving scalability and reliability. Developed NLP pipelines extracting key medical terms from clinical notes to accelerate data retrieval. Adopted AWS services including EC2, SNS, RDS, Elastic Beanstalk, and Lambda for deployment and management. Created sophisticated Angular forms with validation and enhanced UI with Angular Material. Collaborated with engineers and project managers in optimizing banking operations and resource utilization.

Full Stack Engineer at Light in Global

January 31, 2018 - July 28, 2025

Led server-side development using Python/Django MVC framework to build robust back-end services with secure authentication and authorization. Engineered microservices architecture using Django with Netflix Eureka for service discovery and Ribbon for client-side load balancing, enhancing system scalability and resilience. Managed cloud-based infrastructure on Google Cloud Platform using Compute Engine, Kubernetes Engine, and Cloud Storage. Developed microservices deployed using Docker and Kubernetes for horizontal scaling and fault tolerance. Crafted RESTful APIs and SOAP web services for system integration and created CI/CD pipelines using CircleCI and Maven. Collaborated within Agile teams applying Jenkins Git version control and testing.