Tom Hastjarjanto

Software Developer from Amsterdam



  • Node.js / Graphql
  • React / React Native
  • Redux / Apollo
  • Javascript / HTML5 / CSS
  • Docker
  • Git / SVN version control
  • SQL / NoSql databases

Software Development Life Cycle

  • Scrum/Kanban
  • Continuous delivery
  • Code reviewing
  • Jira/Confluence/Bamboo/Stash

Software Engineering

  • Object-Oriented Programming
  • Functional Programming
  • (Mobile) Web Development
  • GUI Development
  • Unit testing/Integration testing


Sytac Software Developer

July 2016 - Current (full-time)
  • Develop applications using Javascript (ES6), ReactJS and React-Native.

Pimmr Software Developer

March 2015 - June 2016
  • Developed an iOS application using Javascript (ES6), ReactJS and React-Native.
  • Developed core features in our backend system using a micro-service architecture deployed in Docker containers on CoreOS.
  • Contributed to the UX design by participating in design sprints, observing user tests and pro-actively proposed and implemented UI modifications when necessary.
  • Suggested and implemented analytics packages and event tracking.
  • Incorporated SEO best-practices and other solutions to drive growth.

Optiver Software Developer

April 2012 - March 2015 (full-time)
  • Responsible for requirements gathering, specification, development and delivery of mission critical trading and risk applications.
  • Part of multi-team projects, involved in design- and architecture meetings.
  • Product lead of several smaller applications.
  • Worked closely with testers to ensure timely and high quality releases.
  • Worked closely with traders to gather requirements and user feedback.
  • Developed software using C#, Python, .NET, Winforms, DevExpress, SignalR and TypeScript.
  • Experienced in using source control, package management and versioning of software with Git, SVN, NuGet and Bamboo.
  • Experienced in using Atlassian products such as Jira, Confluence, Crucible, Bamboo and Stash.
  • Experienced in Agile software development practices such as Scrum, Kanban and continuous delivery.
  • Analysed and resolved performance issues and race conditions by using profilers and debuggers.
  • Analysed and resolved production issues by using user feedback, production logs and system knowledge.
  • Set up trading systems from scratch within a Linux environment.
  • Worked in a multicultural environment with over 30 nationalities.

Spil Games Mobile Developer

April 2011 - April 2012 (part-time)
  • Created a Selenium test suite for our mobile portals.
  • Implemented several new features in the front-end using Javascript and HTML5.
  • Assisted third party developers implementing our API.

KingCom Software Developer

July 2010 - March 2011 (part-time)
  • Implemented Webcam connectivity for a training application for UEFA.
  • Developed C# and actionscript based software applications for clients.

Netsociety Software Developer

March 2008 - June 2009 (part-time)
  • Built the first version of a catalog-to-Adwords API synchronization tool using .NET, C# 3.0, Mssql and Linq-to-sql, NUnit.
  • Built the first version of a reporting tool for Adwords and Analytics using Java, Spring, Hibernate, Maven, JUnit, BlazeDS.
  • Helped customers with troubleshooting Google Analytics implementation issues.

KingCom Front-end Developer

March 2005 - March 2008 (part-time)
  • Helped switching the company to W3 standards based layouts using HTML/CSS and Javascript.
  • Implemented and deployed several designs into W3 standards based templates for the based CMS.
  • Designed and built the UI of a new version of the cms using ASP.NET, YUI and HTML/CSS.

Intellicode Freelance

2005 - 2014
  • Built the initial back-end and front-end using php and mysql.
  • Optimized traffic throughput for by configuring Nginx and apache.
  • Converted the design into crossbrowser compatible HTML/CSS.
  • Helped clients convert their design to W3 standards based HTML/CSS
  • Made a IPhone optimized version of in ASP.NET MVC, JQuery Touch, HTML5 and CSS3.


Utrecht University

2008 - 2013

MSc in Computer Science

IT University of Copenhagen

2009 - 2010

Erasmus Exchange in Game Technology

Universiteit van Amsterdam, Vrije Universiteit


Summerschool in Multicore and GPGPU technology

Utrecht University

2004 - 2008

BSc in Computer Science


1st place HTML5 Gamejam


Spil Games & Google Europe Original version

2nd place software design


Microsoft Imagine Cup Netherlands

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