My Learnings

This page records everything I’ve studied, learned or practiced. This page is inspired by Ben Barbersmith’s .

The points with (*) are my favorites.


I quit my job at Onapp KL after ~4 years working. Started a new career at Billplz as Software Engineer L3.

  • *Learned Clickhouse DB and amazed by how great and unique this OLAP database is
  • Learned B-tree and B+ tree data structure, database indexing, optimization, transaction and isolation levels. Earned Percona Database Indexing Course certification.
  • Learned Ruby on Rails (again after 10 years) and its design patterns (Presenter, Service, Concern, Background Jobs) for my new day job
  • Learned Typescript, NextJS, React for new day job
  • *Built a POC API server for JKJAV website using Redis and Go Fiber
  • Set up Meilisearch to enable searching on our Firestore database. Took a few hours to set up the Meilisearch instance and sync the data from Firestore to Meilisearch.
  • *Shipped my first Golang code to production, integration of an API server with a Malaysia payment gateway (iPay88). The API server is consumed by a mobile app.
  • Taught myself beginner-level Elixir Phoenix framework. Published a simple benchmark here . Tried to build several web apps and API servers using Phoenix but still not feeling productive with it yet.
  • Used Django REST Framework, Nuxt and TailwindCSS to build Tax App
  • Studied UI/UX by reading and watching Refactoring UI by Adam Wathan & Steve Schoger
  • Taught myself OWASP security vulnerabilities (CSRF, XSS, SQL Injection) and mitigations (CSRF Token, SameSite cookies, CSP)
  • Other techs I taught myself: *Redis, Supabase, Chakra UI, Tailwind


  • *Taught myself intermediate-level Django & Django REST Framework. Loving this framework.
  • *Taught myself beginner-level Nuxt & Vue
    • Built many web JAMstack projects together with Django REST Framework
  • Taught myself PostgreSQL and CockroachDB. Learned a bit of DB knowledges like compaction, Write Ahead Logs (WAL), RocksDB storage engine, indexing, materialized views, etc.
  • Taught myself AWS products eg. DynamoDB, S3, Lambda, APIGW, CDK, RDS, etc. Built Voting Serverless App using these techs. Learned DynamoDB single-table pattern.
  • Taught myself GraphQL client. Built a simple chat app that utilizes GraphQL query, mutations and subscriptions. It’s built using Hasura and Nuxt.
  • Taught myself GCP products eg. GCS, BigQuery, Data Studio, GCR, Cloud Build, etc.
  • Studied programming theories like Domain Driven Development, Dependency Injection, Event Sourcing, CQRS, Saga pattern, Design Patterns, choreography & orchestration, Microservice architecture, Port & Adapter pattern, Clean architecture pattern, etc.
  • Other techs I taught myself: Firebase Auth, Stripe integration (Billing & Payments), Hasura, Hashicorp Nomad


  • *Taught myself intermediate-level Kubernetes
    • Wrote a Proof of Concept Kubernetes CSI-compatible storage controller based on Rancher Local Path Provisioner .
    • Plan, set up & manage multiple on-prem edge clusters
  • Taught myself basic AWS & GCP cloud. Taking A Cloud Guru courses
  • Taught myself basic Go. Built non-production web apps using Echo & Gin web framework
  • Other techs I taught myself: Ansible


I started working as a full-time SWE at Onapp KL

  • *Taught myself basics of message brokering & how asynchronous, microservice system works. It radically changed my views on how scalable systems are built.
  • Learned about Python concurrency, multithreading and multiprocessing. Encountered a problem with Global Interpreter Lock (GIL) and solved it by not sharing a variable between the threads
  • Taught myself DevOps tools like Puppet, Grafana, Netdata, etc.
  • Other techs I taught myself: InfluxDB, Nginx Lua, MongoDB, etc.


This is during my university internship year

  • *Taught myself Python. Wrote my first unit tests. Fell in love with Python ever since.
  • Taught myself Docker. My personal development process has changed ever since.
  • Other techs I taught myself: Java Spring & Hibernate, Behavioral Testing with Ruby Cucumber, CI/CD with Jenkins, Elastic stack


  • Studied basic Java, PHP & MySQL in my university years.
  • Developed a document management system with a team of 5 students using IBM Cloud, Cloudant & Cloud Foundry for our university dissertation project.


  • Taught myself Ruby on Rails, Sinatra & jQuery. Built a simple blog and aiming to build a Youtube clone. Too ambitious for 16 years old kid.
  • Deployed my first Heroku deployment
  • Taught myself MySQL

© Fadhil Yaacob 2021

My Learnings