Senior Full Stack Developer

Rate, USD
$45 / hour
Work schedule
Contract, Full Time,
Language skills
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About me

Juha is high-skilled and motivated professional web engineer with 9+ years of extensive experience in web developing. Mastered architecting, developing and implementing interactive websites using multiple programming languages, frameworks and databases.


2010 - 2014 Bachelor @ National University of Singapore


Feb 2021 – Apr 2023 Lead Full Stack Developer @ PrestoDoctor

• Architected and led a development team building real-time communication system for healthcare company using TypeScript, Node.js and React.
• Developed Django REST API for the blog and social site.
• Developed React Native mobile apps interacting with Django and Node API.
• Increased customer satisfaction by 35% and customer retention by 40%.
• Defined 200+ unit tests that ensure 100% code and e2e tests with Cypress and maintained fully automated CI/CD pipelines using CircleCI, reducing production delivery time by 18%.
• Adapted agile methodology for project management, resulting in a 14% decrease in project turnaround time.
• Demonstrated strong delegation skills by effectively assigning tasks and responsibilities to team members based on their skills and strengths, resulting in increased productivity and efficiency.
• Oversaw debugging activities for applications, web pages, and product features to increase speed and function, resulting in a 60% decrease in error tickets.
• Mentored and coached junior developers, resulting in a 10% improvement in team satisfaction score and a 15% increase in overall team productivity.

Dec 2019 – Feb 2021 Senior Full Stack Developer @ Tecinspire

• Implemented Microservice architecture and developed ecommerce site using SpringBoot and Eureka Server.
• Developed micro frontend for ecommerce site using Angular.
• Improved the page speed by 14% that generates $26M annually in revenue by implementing Redis cache to reduce the number of database queries and optimizing performance with GraphQL.
• Advised and implemented Elastic Search for ecommerce site with a catalog of 15000+ products that improves search speed by 35%.
• Used Neo4j to manage Graphical Data and stored indices from MongoDB to the nodes and relations between the nodes to the edges, resulting in a 15% improve in average DB response time and a 10% improve in overall web application performance.
• Built scalable GraphQL API services with Node.js and TypeScript for E-commerce service and PostgreSQL for database.
• Co-operated with data engineering team and transformed ELT model to ETL retrieving data for BI tools from Apache CassandraDB, resulting in a 17% increase in revenue.
• Ensured feature reliability and accessibility through rigorous testing and debugging across devices and network conditions.
• Deployed and monitored applications via AWS services and CloudWatch, ensuring secure and reliable infrastructure.

Jan 2019 – Dec 2019 DevOps Engineer @ Tecinspire

• Used Elastic BeanStalk platform to deploy and manage application quickly and optimize the cost, stored the static files on S3 and managed the load balancing between all the containers using ALB.
• Designed and developed a Serverless Architecture app to ecommerce systemand deployed to AWS Lambda.
• Experienced with different types of database management services including RDS, DynamoDB and Neptune.
• Quickly integrated and updated projects, and deploy it in Docker Container and maintained jobs Github Actions.
• Used multiple containers and orchestrated the web service using Kubernetes.
• Built and deployed Docker containers on AWS EKS breaking up monoliths into microservices that scale on fly in AWS, improving team productivity by 20%.

Jan 2017 – Jan 2019 Full Stack Developer @ Tecinspire

• Implemented Server Side Rendering using Next.js to enhance SEO, improving page load times by 27% and increasing customer satisfaction by 10%.
• Revamped ecommerce website from MPA(CodeIgniter) to SPA(React + Wordpress), built custom themes, configured plugins, and optimized site speed and performance.
• Built Progressive Web Application (PWA) with React, TypeScript and optimized querying in GraphQL using React Apollo and refactored queries to use fragments and In-Memory Cache, improving 25% in team satisfaction score and reducing number of bugs by 15%.
• Developed React Native mobile apps interacting with Ruby on Rails API, resulting in a 20% increase in customer base and increasing revenue by 12%.
• Architected and developed scalable Node.js REST API for expense management system using ExpressJS and MongoDB for database.
• Leveraged advanced technologies such as PostgreSQL and REST API’s to customize and optimize eCommerce applications for improved user experience.
• Utilized TypeScript and JSON Web Tokens (JWT) for authentication and authorization security configurations in Node.js.
• Developed back-end architectures with Laravel, B2C eCommerce API’s and GraphQL queries that enabled faster loading speeds by 35%.

Dec 2014 – Jan 2017 Web Developer @ Webpuppies

• Implemented Spring MVC architecture and developed server side presentation layer using Spring MVC Framework using Maven.
• Designed, implemented, documented, and successfully deployed warehouse integration code in PHP and JavaScript.
• Participated in team project for building customer-facing web applications and MVPs using React, PostgreSQL and Node.js
• Developed and maintained web applications using WordPress, resulting in a 5% increase in revenue.
• Adopted SCRUM development replacing Trello as JIRA and used Git and Sourcetree for Version Control, improving team productivity by 15% and reduced development time by 10%.
• Designed React abstraction components for visualization of data from CRM database to increase 20% in team productivity.
• Designed frontend for Laravel based ERP System API using Vue.
• Developed React Native mobile apps interacting with Ruby on Rails API, resulting in a 20% increase in customer base and increasing revenue by 12%.
• Developed React components using Material UI increasing 20% in user satisfaction.
• Designed and developed front-end for 20+ websites, using AJAX, RequireJS, and Handlebars.js.
• Leveraged my good sense of color to design awesome UI resulting in a 17% increase in conversion rate.

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