Julyus Andreas

Backend Software Engineer with 4+ years of experience delivering banking and financial technology solutions across backend development, system integration, and database management. Experienced in building and maintaining APIs, supporting regulatory reporting systems, integrating applications with external services, and conducting application compatibility assessments for infrastructure modernization initiatives. Strong background in SQL Server, .NET, Go, PHP, and enterprise system troubleshooting, with proven ability to analyze complex production issues, conduct technical assessments, and translate business requirements into reliable and scalable solutions.

Adept at working with business stakeholders, regional teams, and external vendors in fast-paced banking environments. Additionally experienced in AI data annotation and LLM evaluation, contributing to model alignment and quality improvement through structured human feedback workflows.

AI Data Annotator at DataAnnotation.Tech (2026-02 – Present)

A global platform that provides high-quality data annotation services to support AI and machine learning model training and evaluation.

• Annotated and evaluated datasets to support AI/ML model training, validation, and quality improvement.
• Evaluated Large Language Model (LLM) outputs using rubric-based scoring, pairwise comparisons, and rate-and-review workflows.
• Provided structured feedback and rationale to improve response quality, model alignment, and training data development.
• Conducted bilingual Indonesian–English evaluation and localization tasks, including sensitive healthcare-related content.
• Identified inaccurate, unsafe, or inconsistent responses and contributed to the continuous improvement of production AI systems.

Software Development Engineer (Sharia Platform) at Sinarmas Bank (2024-07 – Present)

One of Indonesia's leading financial institutions, providing banking and digital financial services including sharia banking solutions.

• Developed and maintained backend services in Go, integrating core financing systems with external platforms, government agencies, regulatory reporting systems (SLIK, SIKP, and Jamkrindo), and internal banking applications through RESTful APIs.
• Led the redevelopment of the Syariah Finance System into a unified Go-based application, supporting the end-to-end financing lifecycle from loan disbursement and repayment tracking to third-party financing integrations.
• Designed, documented, and maintained APIs using OpenAPI/Swagger and Stoplight, improving integration consistency and collaboration across development teams.
• Designed and optimized SQL Server database structures, T-SQL stored procedures, and financial reporting processes, improving performance through query analysis, execution plan review, and indexing strategies.
• Supported application monitoring and troubleshooting using the Elastic Stack (Elasticsearch and Kibana), enabling efficient log analysis and production issue investigation.
• Implemented and maintained GitLab CI/CD pipelines to automate build, deployment, and release processes, improving deployment reliability and development efficiency.
• Investigated and resolved complex production issues, performed impact assessments, and implemented reliable solutions for business-critical loan applications

Software Development Engineer Enterprise Platform at Sinarmas Bank (2022-08 – 2024-07)

One of Indonesia's leading financial institutions, providing banking and digital financial services including sharia banking solutions.

• Developed and maintained the Perjalanan Dinas Online System (PDOS) using C#/.NET Framework and SQL Server, supporting business travel requests, approval workflows, expense claims, and financial processing.
• Modernized system integrations by replacing SFTP-based file exchanges with RESTful APIs, enabling real-time automated debit and credit journal postings to the core banking platform.
• Developed and maintained T-SQL stored procedures, database objects, and reporting modules to support tax reporting, financial reconciliation, and operational reporting requirements.
• Optimized SQL queries, stored procedures, and legacy application components to improve reporting performance, system reliability, and maintainability.
• Led the adoption of GitLab version control, migrating application source code into a centralized repository and establishing structured branching, versioning, and change management practices.
• Supported application deployment, troubleshooting, incident resolution, and production support activities within Windows Server environments.

Web Developer (Intern) at DNArtworks (2022-04 – 2022-08)

A digital agency specializing in sweb development, design, and digital solutions for commercial clients.

• Developed and maintained 7+ full-stack web applications for commercial clients using PHP, CodeIgniter, MySQL, Bootstrap, and jQuery.
• Set up local development environments using XAMPP (Apache, MySQL, PHP) and deployed applications to Linux production servers via SSH, including database migrations and server configuration management.
• Developed and maintained WordPress-based websites by customizing PHP themes, managing plugins, updating content, implementing security best practices, and optimizing website performance.
• Collaborated with product, UI/UX, and management teams to translate business requirements into functional web solutions and resolve application issues.
• Led the complete revamp of the Koalisi Indonesia Bebas Tar website (koalisibebastar.com), redesigning the frontend, refactoring legacy PHP code, improving user experience, and enhancing overall website performance.
• Optimized MySQL queries and application components to improve page load times, website responsiveness, and maintainability.

Bachelors in Computer Science – Parahyangan Catholic University (2018 – 2022)