Shamim Ehsan
Verified Expert in Engineering
Software Developer
Duluth, MN, United States
Toptal member since June 2, 2020
Engaged with coding since 2013, Shamim started his professional journey in 2016. His main expertise in the IT industry is Java Spring Boot. However, he also has professional experience with C# and JavaScript. He has hands-on work experience with two fintech solutions with an aggregated daily transaction amount on a scale of billions. Moreover, he has a solid background in algorithms and data structures and know-how in education achieved during a teaching assistantship at his university.
Portfolio
Experience
- Spring Boot - 4 years
- Java - 4 years
- Microservices Architecture - 3 years
- React - 3 years
- Node.js - 2 years
- REST APIs - 2 years
- Oracle SQL - 2 years
- MySQL - 1 year
Work Experience
Full-stack Developer for Energy Startup
Peak Power Inc.
- Converted their legacy PHP services into Java microservices.
- Implemented customer portal back end with Express.js.
- Changed manual actions to the automatic scheduler using AWS SQS.
Java Developer
Leading Logistics Support Company
- Implemented microservice endpoints for the client to build their integration platform.
- Built the admin portal using React hooks from scratch.
- Extracted useful information from large XML requests into JSON using a MapStruct library and vice versa.
- Converted a traditional endpoint to a reactive endpoint using a Spring reactor for better performance.
Software Engineer (R&D)
Kona Software Lab, Ltd.
- Designed, implemented, and led multiple microservice components of the Laototo Lottery Game in Laos. Implemented the refund and SMS gateway services from scratch and oversaw the reward management service.
- Developed the back end of a payment gateway service for Nagad, one of the country's largest mobile financial service providers.
- Helped the front-end team by fixing bugs and implemented new pages in the customer website for the lottery game.
- Singlehandedly transformed a gigantic codebase from Spring Boot 1.4 to Spring Boot 2.0. The microservice ecosystem has 30+ independent services.
- Worked directly in the user management service at Kona Card, an emerging fintech solution in South Korea.
Software Engineer
Enosis Solutions
- Converted an existing Android and iOS app to a hybrid app in Xamarin, a C#-based cross-platform mobile framework following the MVVM pattern in MVVMCross.
- Built a POC project in Xamarin, which helps the company confirm a deal with the client using FreshMVVM.
- Built an Android app for the QA team to test a third-party SDK.
Full-stack Developer
Backpack, Inc.
- Worked in the early stage of the company and converted UX design to pixel-perfect React components.
- Implemented a notification service for both front and back end, on the website.
- Created an efficient job scheduler for adding a large number of promotion coupons into the system.
Teaching Assistant
Shahjalal University of Science and Technology
- Worked as a teaching assistant for course material including structured programming languages, data structures, and algorithms.
- Assisted the course teacher in lab classes and prepared lab exam questions.
- Evaluated theory and lab exam sheets for the students.
Project History
Nagad
Kona-Card
Aprio Board Meeting App
Lao Toto Lottery Game
BackPack
Education
Master's Degree in Computer Science
University of Minnesota - Duluth, MN, USA
Bachelor of Science Degree in Computer Science
Shahjalal University Of Science And Technology - Sylhet, Bangladesh
Skills
Libraries/APIs
React, REST APIs, Node.js, Socket.IO
Tools
Gradle, RabbitMQ, Confluence, MQTT, IntelliJ IDEA, Jira, CircleCI, Jenkins
Languages
Java, JavaScript, C++11, HTML, ECMAScript (ES6), C#, HTML5, CSS, Swift, C++
Frameworks
Spring Boot, Spring, Express.js, Swagger, Hibernate
Paradigms
REST, Microservices Architecture, Microservices, RESTful Development
Platforms
Linux, Android, Xamarin, Docker, Firebase, Oracle, Amazon Web Services (AWS), Google Cloud Platform (GCP), Kubernetes
Storage
Oracle SQL, MySQL, PostgreSQL, Redis, Memcached, Spring Data JPA
Other
Competitive Programming, Mathematics, Algorithms, Data Structures, Axios, Web Security, GitHub Actions
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