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I am a Senior Full-Stack .NET Developer with 9+ years of experience building enterprise-grade applications and transforming manual business processes into scalable digital platforms. I specialize in ASP.NET Core, React, and AWS, with hands-on experience in system architecture, backend development, and cloud deployment. I love taking ownership of end-to-end product development, leading small teams, and delivering production-ready solutions in complex enterprise environments. I have a proven track record of guiding cross-functional teams, implementing CI/CD pipelines, and mentoring junior engineers to improve code quality and on-time delivery.…I am a Senior Full-Stack .NET Developer with 9+ years of experience building enterprise-grade applications and transforming manual business processes into scalable digital platforms. I specialize in ASP.NET Core, React, and AWS, with hands-on experience in system architecture, backend development, and cloud deployment. I love taking ownership of end-to-end product development, leading small teams, and delivering production-ready solutions in complex enterprise environments. I have a proven track record of guiding cross-functional teams, implementing CI/CD pipelines, and mentoring junior engineers to improve code quality and on-time delivery.

Selly Johansyah Isamuddin

Developer, Programmer, Web Developer, +4

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I am a Senior Full-Stack .NET Developer with 9+ years of experience building enterprise-grade applications and transforming manual business processes into scalable digital platforms. I specialize in ASP.NET Core, React, and AWS, with hands-on experience in system architecture, backend development, and cloud deployment. I love taking ownership of end-to-end product development, leading small teams, and delivering production-ready solutions in complex enterprise environments. I have a proven track record of guiding cross-functional teams, implementing CI/CD pipelines, and mentoring junior engineers to improve code quality and on-time delivery.…I am a Senior Full-Stack .NET Developer with 9+ years of experience building enterprise-grade applications and transforming manual business processes into scalable digital platforms. I specialize in ASP.NET Core, React, and AWS, with hands-on experience in system architecture, backend development, and cloud deployment. I love taking ownership of end-to-end product development, leading small teams, and delivering production-ready solutions in complex enterprise environments. I have a proven track record of guiding cross-functional teams, implementing CI/CD pipelines, and mentoring junior engineers to improve code quality and on-time delivery.

Available to hire

I am a Senior Full-Stack .NET Developer with 9+ years of experience building enterprise-grade applications and transforming manual business processes into scalable digital platforms. I specialize in ASP.NET Core, React, and AWS, with hands-on experience in system architecture, backend development, and cloud deployment.

I love taking ownership of end-to-end product development, leading small teams, and delivering production-ready solutions in complex enterprise environments. I have a proven track record of guiding cross-functional teams, implementing CI/CD pipelines, and mentoring junior engineers to improve code quality and on-time delivery.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Indonesian

Fluent

English

Advanced

Work Experience

Software Developer at PT. Bithealth Teknologi Pintar

November 1, 2021 - August 31, 2024

Designed and developed over 30 new APIs and updated more than 50 for mobile and web applications, streamlining operations for healthcare professionals. Actively participated in code reviews, ensuring code quality and adherence to best practices within a collaborative development environment. Collaborated with cross-functional teams to achieve development goals and ensure smooth integration, resulting in 100% of projects meeting deadlines. Enhanced software performance by more than 25% by optimizing queries and implementing effective indexing in production server databases.

Software Developer at PT. Berlian Sistem Informasi

September 1, 2018 - November 30, 2021

Collaborated with the SAP team to switch integration process to Web APIs, reducing storage costs by 10% and improving data logging and tracking. Implemented new features, updated existing features, and fixed bugs in an ERP application with a team of 12, resulting in a 15% annual reduction in support tickets. Mentored 7 junior developers, providing training and guidance on best practices in application development, company standards, and flow of application development from start to finish, including production release. Led a team of six, including business analysts and junior developers, to build a web application for a call center, integrating it with a Cisco application using web APIs. Coordinated sprint planning, grooming, and daily stand-ups, ensuring alignment and efficient execution.

Software Developer at PT. Adicipta Carsani Ekakarya

February 1, 2017 - September 1, 2018

Developed a website for an insurance company to facilitate online purchases, leading to a 10% revenue increase and a 20% reduction in third-party costs. Assisted an insurance company in migrating a VB.Net retail application to modern C# ASP.Net and Knockout JS web apps. The resulting applications are now easier to maintain and more flexible. Worked closely with the PO and Scrum Master to gather requirements, and incorporated user feedback into iterative improvements for better usability and satisfaction.

Software Developer at PT. Mitra Integrasi Informatika

October 1, 2015 - February 28, 2017

Developed an AFE web app: Streamlined expenditure submissions and approvals, reducing costs by 10% and ensuring transparency in multi-tiered authorizations. Empowered users by providing necessary training for effectively utilizing the web application, while creating comprehensive user guide documentation to enhance understanding and elevate the user experience.

Senior .NET Developer (Acting Lead) at Freelance

September 1, 2025 - Present

Architected and developed a Vendor Management System using .NET 8 and React, automating 15+ manual workflows and reducing onboarding time by 40%. Led a cross-functional team of 3 developers, conducted code reviews, and mentored junior engineers to ensure 100% on-time delivery of milestones. Built a robust CI/CD pipeline using AWS CodePipeline and GitHub Actions, reducing deployment time from 45 minutes to 10 minutes.

.NET Engineer at PT Health Technology Pintar

November 1, 2021 - August 1, 2024

Developed and maintained multiple healthcare systems (nurse mobile app, doctor web app, surgery scheduling, and home care platform). Designed and implemented RESTful APIs using ASP.NET Core and SQL Server, enabling seamless integration with hospital systems and EMR. Optimized SQL queries to reduce data latency by 35%, built nurse mobile app for patient care, and implemented a surgery scheduling system integrated with doctor availability and hospital workflows. Maintained 99.9% uptime for critical health systems through proactive monitoring.

Software Developer at PT. Berlin Sistem Informasi

September 1, 2018 - November 1, 2021

Led development of enterprise applications such as a vehicle sales management system and call center platforms. Implemented integration with SAP via text file exchange and REST APIs, reducing storage costs by 10% and improving data synchronization. Built and enhanced call center applications with structured customer feedback tracking, complaint logging, and follow-up workflows. Ensured high reliability with proactive monitoring and SLA adherence.