Jovansonlee B. Cesar

Opensource programmer with passion for innovative technologies

Software Engineer
Framework architect
Library maintainer
Opensource contributor
mobile: +639156659318
email: ivanceras@gmail.com
skype: ivanceras

Expertise

Substrate and rust base blockchain
Data analytics and visualization
Heuristic programming on complex problems
High availability and scaling solutions
Code quality and code correctness
Research and development

Preferred Technology Stack

Linux, Rust, Substrate, PostgreSQL, Webassembly

All Technology Stack

Linux, Rust , PostgreSQL, Java, Php, Bash/Shell, Docker
Javascript, HTML/CSS, Elm , Webassembly , React, React-native
PostgreSQL ,Mysql,Oracle,SQLite, Hadoop/Hive/MapReduce
git, vim, Eclipse, IntelliJ
xls+ods+csv data processing

Professional Work Experience

ChainSafe System Inc., (October 2021 - Present)
- Protocol Engineer
- Responsibilities:
  - Migrate old version of chainbridge pallet into new version of Substrate
  - Involve in integration work for Arweave, NEAR, Solana blockchain
- Technologies used:
  - rust , substrate, docker, erlang
Freelancing and opensource (August 2020 - October 2021)
- Improve and release new versions of opensource projects: (sauron, svgbob)
- Self-study substrate framework and polkadot
Centrifuge Inc (March 2020 - May 2020)
- Centrifuge-chain protocol engineer
- Responsibilities:
  - Build and integrate substrate pallet/modules into centrifuge-chain
  - Build and integrate monitoring tools for blockchain validators and nodes
- Technologies used:
  - rust , blockchain, cryptography, paritytech/substrate , polkadot network, prometheus + grafana, bash scripting
Freelancing and opensource (May 2019 - Dec 2019)
- Self study rust and freelance contracts.
- Projects:
  - dns gateway module - an independent contract project which manages and automate acquisition of ssl certificates from lets-encrypt. - dynamically serve multiple domains in one server using the appropriate certificate for the requested domain. - involves low level parsing of tcp-packets, extracting the SNI/domain name in the handshake process.
  - open-api parser - generates rust source code from open-api spec.
- Technolgoies used:
  - rust , tokio, actix-web, rustls
Senior Software Engineer at Copyleft Solutions (Jun 2017 - Dec 2018)
- Involvement
  - Fix and maintain existing android applications
  - Port excel spreadsheet apps into web application
  - Prototype small experimental projects involving webcam and image processing
  - Screened and interview talented developers into the company
- Technologies used
  - Android/Java, typescript
  - Rust, gtk
Senior Software Engineer at TRUSTe/TrustArc (Jan 2012-Jun 2017)
- Projects
  - Multi-region database selective syncing setup.
    - Setup custom configuration to selectively sync certain data from EU-US region, while complying the EU regulations of which data is not allowed to move out of EU servers.
  - Created a custom lightweight ORM which doesn ’ t allow loss of data in the event of database downtime up to several hours.
- Involvement
  - Prototype and build critical products in the organization, such as the portal which links all the apps in the organization.
  - Design database schema for high throughput application, such as the backend for ads system.
  - Research and development on processing 1TB of logs per month into an analytical report, using appropriate BigData Analytics tools such as Hadoop/Hive.
  - Implemented a sophisticated requirement to do selective synchronization of data into multiple database instances from different regions, in accordance to US and EU data regulations.
  - Brought the database to terabyte scale, making it to the top 5 AWS apps in terms of page impression.
  - Data recovery and correction through scraping out logs from the production servers, in the event of unexpected data loss.
  - Completed an backend service for doing static and dynamic analysis of ios apps.
  - Implemented a project involving document search using amazon ElasticSearch.
- Skills used
  - Java , GWT, Amazon EMR, Amazon SDK(lambda, s3, elasticsearch)
  - Javascript, Angularjs, jquery, bootstrap
  - PostgreSQL, SymmetricDS, SQLite
  - Rust, python, C, bash
- Senior Software Engineer at Cebu Machine Laboratories Inc. (Oct. 2010 - Jan. 2012)
  - Involvement
    - Research and prototype an Interactive Comic Game for the Ipad when it first came out.
    - Using C, Objective-C and opengl, animate 2D assets created by the artist.
  - Accomplishments
    - Used stencil and svg overlay on the 2D images, presented as a very simple solution to animate 2D images for an interactive comic game.
- Junior Software Engineer at Cebu Mitsumi Inc. (Apr 2007 - Aug 2009)
  - Involvement
    - Maintain and improve an existing Shop Floor Control/Manufacturing Management Software.
    - Improved the existing UI and UX to reduce the number of actions to accomplish tasks.
    - Improved the flexibility of the report generator to provide a more detailed view of the data into an interactive excel spreadsheet.
  - Skill used
    - Oracle
    - Powerbuilder, Powerscripts
    - MS Excel Spreadsheet, VBA scripts and macros.

Education

Bohol Island State University ( 2002-2007 ), C.P.G North Avenue, Tagbilaran City, Bohol
- Bachelor of Science in Computer Engineering
- Learning highlights
  - Linux
  - C, Lowlevel-C Programming, PIC
  - Hardware interfacing
  - Self-taught: php, javascript, html/css.

Desirable qualities

I do research, experiments, exploration on my free-time on just about anything ranging from database tools, neat algorithmns, learning programming languages, voxel-based raytracing, baremetal OS.
Incorporate these learnings into company products.

Opensource project involvement

Svgbob - converts inline ascii scribbles and diagrams into a nicely rendered svg,
- demo
Rustorm - an orm for rust, primarily used by the diwata project.
Sauron - A very fast library for building web apps, using the latest web technology: webassembly.
Restq - An alternative to graphql which parses http url to express an api query.