About Us

Getting To Know Cellsist

Cellsist is a software development company based in Singapore.

We are a team of Lead Software Engineers and Problem Solvers Specializing in Building Web and Mobile Applications that Fit + Deliver Value to Your Unique Business Needs and Ongoing Operations.

We have Over 60 Years of combined experiences in leading and developing software projects across Banking and Finance (FinTech), Telecommunications, Healthcare industries etc.

Our services include Custom ERP development, Custom CRM development, Enterprise Software,
Web Application development, Mobile Application development and Custom Software development.

Particularly projects involving advanced technologies, intricate business workflows and replacement solutions for existing software that fails to deliver or falls under expectations.

We are proud to offer the Right Combination of technical, business acumen and communications skills that benefits the entire software project lifecycle.

We believe in People-Centric Approach towards business software excellence, and an active partnership with our clients to achieve the best possible productivity outcome.

We aim to be the go-to company for good quality custom business and enterprise software.

Meet Our Lead Software Engineers

Tan Tee Theng, Solution Architect

Tee Theng has 18 years of hands-on software development experience; specializing in custom business software and data analytics solutions.

Prior to setting up Cellsist, Tee Theng was the technical lead at Sentryi Pte Ltd, a wealth management software startup. He developed the wealth management software with advanced financial analytics and simulations that enabled wealth managers to build investment funds portfolio and propose retirement planning. The software gained over thousand users across Asia Pacific and was acquired by ASX listed financial software company Iress Ltd. His previous experiences included co-founding an engineering simulations startup and a stint at an online discount travel startup in Silicon Valley, United States.

Currently, Tee Theng’s primary focus is customizing software solutions for commercial enterprises.

He emphasizes meaningful communications with his clients, believing that understanding people’s problem is of paramount importance in software design and development. He is often credited for the ability to focus on the true intent of a user request, instead of blindly follow specifications given. His vast experience enables him to draw analogues from different industries and propose a solution that fits.

Tee Theng has been actively involved in leading and developing all Cellsist’s software projects including the case studies present in this website. He currently continues to assist clients (both locally and internationally) in identifying business and technical requirements, and consulting on the best way to implement solutions specific to their needs. On top of his work, he continues to mentor junior developers in the team.

Tee Theng graduated with a Bsc in Mechanical Engineering (Special Distinction) from the University of Oklahoma, United States, and has completed all 3 levels of CFA (Chartered Financial Analyst) exams.

Areas of Focus Include:

  • End To End Web Based Enterprise Application Design And Development
  • User Experience And Software Workflow Design
  • Graphical Data Analytics And Simulation Engine
  • Interactive Data Visualization
  • Kiosk Software Development

Key Products and Solutions Portfolio Include:

  • Clinic Management System
  • ERP Solutions / CRM Solutions
    (Education, Lifestyle Businesses etc.)
  • Private Banking Account Opening Application System
  • Wealth Management Portfolio Investment Software
  • Real Time PDF Manipulation
  • Customized OCR Solutions

Som Nath Chakravarty, Software Architect


Som has close to 25 years of commercial design and development experience in high-performance, highly scalable, mission-critical and portable software.

He graduated from NUS with a 1st Class Honors in Computer Science  and later completed his Masters in Computer Science, specialising in Graph and Combinatorial algorithms. He has a strong background in the mathematics of computing (especially algebra and combinatorics), algorithms and data-structures, coupled with extensive experience in programming, as well as in-depth knowledge of compilers, operating systems and distributed middleware.

He has solved difficult problems in domains like defence and telco, and in areas like data-warehousing, data fusion, real-time analytics and distributed computing. He has worked for companies like DSO National Labs, D2K and Borland, where he has helped deliver numerous enterprise class solutions and cutting-edge software products and tools, e.g. Borland’s VisiBroker, over several life cycles. The solutions and products were deployed in mission critical operations in enterprises, where they perform millions of transactions daily, on a 24x7 basis.

In the last 16 years, he has worked as a technology consultant and entrepreneur, focused  heavily in technology related to data analytics, high-performance real-time messaging and blackboard middleware, as well as mobile and cloud-based computing.

Areas of Focus Include:

  • End To End Mobile Application Development, Both For Consumer and Enterprise Applications
  • Graph and Combinatorial Algorithms
  • Data Fusion And Blackboard Systems
  • Messaging And Broker Oriented Architectures
  • Cross Platform And Cross Language Implementation

Key Products and Solutions Portfolio Include:

  • Real-Time Multi-Sensor Situation Assessment System For C3I
  • Real-Time Blackboard
  • Telco Service Delivery Broker
  • Data Warehousing Engine
  • Commercial Middleware (VisiBroker)

Daniel Lim Kok Yong, Software Architect


Daniel has close to 25 years of commercial design and development experience in high-performance, highly scalable, mission-critical and portable software.

He graduated from NUS with a 1st Class Honors in Computer Science and later completed his Masters in Computer Science, specialising in Constraint Programming techniques and algorithms. Has a strong background in mathematics (especially in mathematical optimisation and combinatorics), algorithms and data-structures, coupled with extensive experience in programming, programming paradigms, compilers and operating systems, as well as proven expertise in data and mathematical modeling.

He has solved difficult problems in domains like defence and telco, and in areas like data- warehousing, distributed simulation, real-time analytics and distributed computing. He has worked for companies like DSO, Creative, ILOG, D2K and Borland, where he has helped deliver numerous enterprise class solutions and cutting-edge software products and tools, e.g. Borland’s VisiBroker, over several life cycles. The solutions and products are deployed in mission critical operations in enterprises, where they perform millions of transactions daily, on a 24x7 basis.

In the last 16 years, he has worked as a technology consultant and entrepreneur, focused heavily in full-stack development, high-performance real-time messaging and blackboard middleware, as well as mobile and cloud-based computing.

Areas of Focus Include:

  • End To End Mobile Application Design And Development, Both For Consumer And Enterprise Applications
  • Mathematical Optimization Techniques And Algorithms
  • Messaging And Broker Oriented Architectures
  • Real-Time Simulation Engines And Blackboard Systems
  • Cross Platform And Cross Language Implementation

Key Products and Solutions Portfolio Include:

  • Telco Service Delivery Broker
  • Data Warehousing Engine
  • Commercial Middleware (VisiBroker)
  • Real-Time Blackboard
  • Real-Time Simulation Engine
  • Music Compression