Working as a Principal Software Engineer for Userflow.

Used several technologies including Phoenix, Websocket, ClickHouse, Redis, PostgreSQL, Oban, Kubernetes, Cloudflare, Prometheus, Elasticsearch, Pinecone.

Worked as a Lead Software Engineer for Scripbox.

• helped setup a standardized observability system that encompasses metrics, logs, and traces for all applications.
• implemented event logs using Kafka and Debezium, guaranteeing the transactional integrity of the published messages.
• external event integration with providers such as Amplitude and WebEngage was previously implemented independently across multiple services in an ad hoc manner. I unified the implementation, making it easier to integrate with new providers.
• led the implementation of BSE direct fund offering.

Used several technologies including Rails, Phoenix, MySQL, Elasticsearch, Kafka, Redis, PostgreSQL, Exq, Kubernetes, Kong, Prometheus, Debezium.

Worked as a Senior Software Engineer for the merchant platform division of Gojek.

• helped build the system which handles communication with external parties like KFC, McDonald, Bluebird, etc
• designed and implemented the initial version of shuffle card service for Gobiz Mobile App
• helped rewrite a critical high throughput service in Elixir
• written plugins for background job processing system to handle new use cases
• was involved in the implementation of various authentication and authorization related features

Some of the libraries — namely exq_limit and exq_batch — are open-source. Used several technologies including Rails, MySQL, Elasticsearch, Kafka, Redis, BigQuery, Exq, Kubernetes.

ActiveSphere was a boutique software consulting company with 10 to 15 engineers. We got acqui-hired by one of our clients, Gojek. Some of the client projects I have worked on include

Midtrans is a leading payment gateway in Indonesia.

• was part of the team which develops the snap product, an embeddable payment form
• helped them migrate their notification system to Elixir stack to improve throughput and resource consumption
• built the initial version of centralized auth server based on oauth protocol
• built a streaming report generation system that could export hundreds of thousands of rows of data in xlsx and csv format while maintaining constant memory overhead
• helped with establishing a pattern for kafka consumers. There are now 10s of consumers processing millions of events per day. Built a system to selectively reprocess historical events.
• helped with decoupling services which were directly accessing each other's databases

Some of the libraries — namely redix_sentinel, barlix, xml_stream and zstream — are open-source. Used several technologies including Rails, React, MySQL, Elasticsearch, Kafka, Redis, BigQuery, Exq, Kubernetes, Gitlab CI.

I was a core member of the team that developed Energy Manager, a web app used by professionals to visualize and understand energy usage. I have touched many parts of the system. My main contribution includes writing and improving various charts like load profile, consumption, heatmap etc using D3. I have also written an automated test system to generate charts for various combinations of state and compare their screenshots with previous versions to catch regression and a library named μ to compress url parameters. Used several technologies including Node.js, D3, AngularJS, Knockout.js, Redis.

Developed and deployed a web based business process management system. Used several technologies including NGINX, Unicorn, Rails, Solr, MySQL, Amazon EC2, Amazon SES, qpsmtpd, Redis, OAuth, Capistrano. Authored a WYSIWYG Form Editor similar to wufoo.com.