Hi! Thanks for Visiting This is Danstan Otieno Onyango

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About Me.

I am a software Developer and System Administrator. Below is a description of my areas of Expertise.

I am fluent in dozen of popular languages like C Language , JavaScript , Java Enterprise Edition , PHP and Python . More Details...

I am experienced in C applications for Point of Sale Systems, Java base Web applications with Spring and Hibernate Frameworks, NodeJs and AngularJs Applications ,Mean-Stack,

SQL Database Design and Administration including Oracle 12c. I also have immediate level experience with NoSQL Database mainly MongoDB. More Details...

I am an enthusiast of Linux having used the operating system at client and server level for more than three years.

My knowledge of Linux and Computer Network Standards and Protocols is the core of my experience with VMware ESXI and Citrix XenServer Virtualization Environments. I have built scalable virtual environments for my clients. This means I have professional experience in DataCenter Management More Details...
Vew My GitHub Profile to see More

Social Media Profiles


Here are Some of My Projects

  • all
  • Agency Banking
  • Backends
  • User Interfaces

This is a javascript library for handling the standard ISO 8583 banking message standard. It supports versions 1987, 1993 and 2003. The library is confugurable for user defined formats, message types and encodings.
See the Code on GitHub

This is a ReactJS blogging application that is fully progressive and search engine optimized. This application has rich text support using draftjs.
Check it out

I have done a number of backends including Mobitll, Fupisha, My own Blog and other solutions for various clients.

Let's Discuss


Well, a few details of my work experience.

Projects Done
Happy Clients
Hours of Work
Cup of Coffee

Services I offer

I offer both Software related and System related services.

Software Developer

JS Developer ~ NodeJS

My GitHub Profile say it all. I have years of experience coding Real Time Web Applications in Nodejs. I have used core NodeJS modules like Net, Events, Streams, http and Sockets to create web applications running on Docker and Kubernetes. I have a clear microservice architecture in my design orientation nd deployment approach that puts me at the startegic point as a software developer who has scale, speed, efficeinecy and cost at heart. My experience has included a wide range of DataBase engines from MongoDB, RethinkDB and Reddis among others.

IT Support

Being an experienced Software Developer and also an excellent Systems Administrator, I have the ability to support customer first IT products.

Cleaning Code

Code optimization and Documentation are key in improving performance. I am a believer of clean code. Saves time and Resources especially during upgrades and Maintenance. I offer code CleanUp, Optimization and Documentation. Try this for your existing projects.

System Adminis tration

Network and Security

Well, let's just say I know alot about DMZs, VLANs, VPNs, Firewalls: pfSense, Endian, ClearOS, UFW, KMS, SSL, TLS, PCI-DSS, WAF, IpTable, Linux, SE-Linux, Cisco, Cloud and a lot other tech. I don't see security that doesn't touch these. I didn't forget to mention cryptography

Server Configuration

I know a lot about Linux. Arch and Gentoo being my favorites. So, Mail Servers, FTP Servers, Databse Servers, Web Servers, Proxy Serves, VPN Servers and DNS Servers are fun. Linux Professional. This does not leave Windows Server out. Really.


Speak of Citrix or VMware. Implementation of ESXI or XenServer Box locally and Remotely. VM installation, Migration, Interconnection, Security, Resource Sharing. I basically know how the hardware layer of Cloud works. I have long relationships AWS, GCP and Server Prontos Clouds


VMWare ESXI, Citrix XenServer, VirtualBox, VMWare Workstation. Implementation of Virtual Environments and Cloud Infrastructure Management

VPNs and SSL

Virtual Private Networks (VPNs) technologies mainly IPSEC. Unix implemetation(Site-Site), Cisco IPSEC Implementation

LANs and WANs

Ethernet, OSI Model, OSPF, EIGRP, VLANs, STP, PPPOE, PPPOA, IPsec are among the protocols i can work with. Implementation of scalable subnets and IP Plans, Virtual LANs, Virtual Private Newtorks.

Programming - Coding

Front End Design -UI

I love ReactJS, I have done several frontends in Reactjs like This Blog and Mobitill Dashboard Fyipe and Fupisha are also a dashboard I did in ReactJS. HTML, CSS, SCSS, Webpack, StorybookJS, a little of Angular and Vuejs.

Backend Engineering

This is my favorite. I have couple of years with NodeJS server side programming implementing real time web applications for IoT, payments and other solutions. I am learning Python now.

Pos Applications

I have done C based Point of Sale applications. Here there is EMV and NFC transactions processing. Some of the models I have worked with are by Telpos and Castles. Check out this ISO 8583 JavaScript library for Nodejs that i implemented for banking systems that use the standard.

DataBases SQL-NoSQL


I am an immediate level Oracle 12c Administrator. Able to do optimization, upgrade, configuration, security and Tuning. PostgreSQL and MySQL are members of my club here.


Being a complete fun of NodeJs ServerSide programming, I find it great working with MongoDB and RethinkDB. The combination provides highly scalable applications and systems that are easy to manage, resource saving. I have configured sharded and replicated cluster for both.


For In-Memory databases, I know Redis is just the tool for the job. I use this for catching, session management and other key value store database requirements that dont need persistent data.

Frame works


Well, I know Node is not a framework, instead its a Runtime Environment for JS. That being said, I have years of Nodejs experience. Just try me. most of my previous projects have been done in NodeJS.


ExpressJS is the defacto web framework for NodeJS.


React is one of the most popular front end development libraries. I have more than 2 years experience doing ReactJS. Check these out This Blog and Mobitill Dashboard Fyipe and Fupisha are also a dashboard I did in ReactJS

Are You Looking For Professional Software Developer or System Administrator?

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