Sujit Singh
Mentor
(115 reviews)
US$20.00
For every 15 mins
298
Sessions/Jobs
ABOUT ME
Ex-CTO | 19+ Years in .NET | Built 9 Products | 5-Star Mentor (115 Reviews)
Ex-CTO | 19+ Years in .NET | Built 9 Products | 5-Star Mentor (115 Reviews)
I help developers and teams solve tough technical problems — and I've been doing it for 19+ years.
As a former CTO of a FinTech company (5 years), I've architected enterprise platforms used by banks worldwide. I've personally built 9+ products — desktop, Android, and SaaS — serving 3,500+ users across 100+ countries.
What I can help you with:
- C#, .NET, ASP.NET Web API — deep expertise from architecture to debugging
- WinForms, WPF, Xamarin — desktop and cross-platform apps
- OCR, PDF parsing, Tesseract, image analysis — data extraction at scale
- Elasticsearch, Logstash, Kibana — search and analytics
- Azure Functions, AWS, CI/CD — cloud and DevOps
- Web scraping, performance optimization, legacy modernization
- Code reviews, architecture guidance, and career mentoring
My track record: 5.0 stars across 115 reviews on Codementor, Top-Rated on Upwork ($90K+ earned, 100% Job Success), and products ranked #2 on Peerlist and #7 on Product Hunt.
I don't just fix your code — I teach you why it broke and how to prevent it next time. Whether you need a quick debugging session or long-term mentoring, I'm here to help.
Hindi, English
New Delhi (+05:30)
Joined December 2016
EXPERTISE
19 years experience | 17 endorsements
C# has been my primary language for 19+ years. I've used it to build enterprise platforms, desktop utilities, web APIs, and cross-platfor...
C# has been my primary language for 19+ years. I've used it to build enterprise platforms, desktop utilities, web APIs, and cross-platform apps. As CTO of a FinTech company, I architected performance-critical systems handling millions of records. I can help with debugging, architecture decisions, performance optimization, WinForms, WPF, Xamarin, ASP.NET Web API, LINQ, Entity Framework, and more.
15 years experience | 3 endorsements
15+ years working with SQL across enterprise platforms, SaaS products, and client projects. As CTO of a FinTech company, I designed and o...
15+ years working with SQL across enterprise platforms, SaaS products, and client projects. As CTO of a FinTech company, I designed and optimized complex database architectures on SQL Server handling millions of loan records with high-performance queries, stored procedures, and indexing strategies. I've also worked extensively with PostgreSQL, MySQL, and SQLite across different product stacks. I can help with query optimization, database design, stored procedures, triggers, migrations, and troubleshooting slow queries.
8 years experience
I help clients with advanced Excel tasks — from complex formulas and pivot tables to data analysis, dashboards, and automation. I've buil...
I help clients with advanced Excel tasks — from complex formulas and pivot tables to data analysis, dashboards, and automation. I've built Excel-based reporting tools and data processing workflows for clients on Upwork and Codementor. Whether you need help with VLOOKUP/INDEX-MATCH, conditional formatting, data cleanup, or integrating Excel with external data sources, I can get it done efficiently.
6 years experience
I build custom VBA macros and automation scripts that save hours of manual work. I've created automated reporting systems, data processin...
I build custom VBA macros and automation scripts that save hours of manual work. I've created automated reporting systems, data processing pipelines, and custom Excel tools for clients across industries. My VBA work includes UserForms, API integrations, file I/O automation, and complex data manipulation. If you have a repetitive Excel workflow, I can automate it.
7 years experience | 1 endorsement
7+ years working with Microsoft Azure for cloud infrastructure, serverless computing, and DevOps. I've built and deployed Azure Functions...
7+ years working with Microsoft Azure for cloud infrastructure, serverless computing, and DevOps. I've built and deployed Azure Functions, Web Apps, WebJobs, and CI/CD pipelines for production SaaS products. As CTO of a FinTech company, I managed Azure-hosted enterprise platforms serving clients worldwide. I can help with Azure Functions, App Services, Blob Storage, Azure SQL, Application Insights, and cloud architecture decisions.
8 years experience
8+ years building web scrapers and data extraction tools for clients across industries. I've built production-grade scraping systems usin...
8+ years building web scrapers and data extraction tools for clients across industries. I've built production-grade scraping systems using C#, Python, Selenium, and headless browsers — handling JavaScript-rendered pages, pagination, anti-bot measures, and proxy rotation. I've delivered large-scale scraping projects on Upwork involving e-commerce data, real estate listings, financial data, and more. I can also help with API integration, data cleaning, and structuring scraped data into usable formats.
4 years experience | 9 endorsements
I can build highly sclable API's using Asp.net Web Api and I also know Asp.net Webforms
I can build highly sclable API's using Asp.net Web Api and I also know Asp.net Webforms
REVIEWS FROM CLIENTS
(115 reviews)
Jeff Stemper
May 2025
He is very knowledgeable and I will be sure to use his expertise when needed in the future.
Malaika Messi
September 2024
Sujit was great and helped me with my project. He also stopped the timer to give him more time to understand the code without me having to pay for those minutes and that was much appreciated !
Alex B.
September 2024
SQL Expert, very professional and helpful
PAUL kelley
June 2024
Sujit is definitely a 5 star coder and developer.
He's been assisting me in developing a C# application integrated with a database, which I'm utilizing for studying and trading futures. Essentially, I outline my requirements, and he implements them. While some aspects are quite intricate, he consistently delivers great results.
Based on my outline, Sujit gives me a quote on how long it will take. The turnaround is usually quite short, and he is very patient in debugging it.
I highly recommend Sujit and will continue to utilize his services.
Alan Haden
April 2024
Very helpful and patient. My issue as described was resolved and I now have a new approach.
Easy to understand.
Highly recommended!
Mark Holland
February 2024
I recently received assistance from Sujit Singh with implementing unit testing for my WinForms (Windows Forms) application built using the Microsoft .NET Framework, and it was a fantastic experience. As someone completely new to unit testing, I was seeking guidance on setting up a testing framework, understanding best practices, and writing effective test cases for my existing application code. The individual I worked with was incredibly knowledgeable and quick to assist me every step of the way. They not only helped me set up the testing framework but also provided valuable insights into best practices and troubleshooting when issues arose. Their guidance was instrumental in helping me grasp the fundamentals of unit testing and apply them effectively to my project. I'm extremely grateful for their expertise and highly recommend them to anyone seeking assistance with unit testing or software development in general. Thank you for your invaluable help!
Nicholas Taylor
December 2021
Immediately available to assist and swiftly solved the issue.
Mikail Miller
December 2021
Knowledgeable and efficient. Would highly recommend and will work together in the future.
Sara Muhtar
January 2021
Was good and really helped me with the assignment.
tony rash
January 2021
He is very good and the best there is. Than you again for another successful lesson/freelance job.
SOCIAL PRESENCE
781 Reputation
1
10
23
EMPLOYMENTS
Director and Founder
StepForward Solutions LLP
2023-11-01-Present
Leading StepForward Solutions LLP (Kaizen Apps), where I've built and shipped 9+ products from concept to market — including desktop apps...
Leading StepForward Solutions LLP (Kaizen Apps), where I've built and shipped 9+ products from concept to market — including desktop apps, Android apps, and SaaS tools.
Products serve 3,500+ users across 100+ countries, with rankings of #2 on Peerlist and #7 on Product Hunt. Key products include PicBackMan (photo/video backup utility featured by Wall Street Journal), Logstail (real-time log monitoring), and ProWritingEditor (AI writing tool).
Tech stack: .NET, WPF, WinForms, Xamarin, Elasticsearch, Android (Kotlin), Azure Functions, CI/CD pipelines.
C#
WinForms
Elasticsearch
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C#
WinForms
Elasticsearch
RabbitMQ
Kibana
Logstash
Apache Kafka
ASP.NET
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Chief Technology Officer (CTO)
Sumeru Enterprise Tiger Business Solutions Pvt. Ltd
2020-12-01-2023-11-01
Served as CTO for this FinTech company, building and scaling the entire technology platform (ENCollect) from scratch — used by banks and ...
Served as CTO for this FinTech company, building and scaling the entire technology platform (ENCollect) from scratch — used by banks and financial agencies worldwide for end-to-end loan collection management.
Led architecture decisions, technology selection, team building, and hands-on development of performance-critical modules. Managed the full engineering team while personally building core components handling millions of loan records.
Key achievements: designed high-performance search infrastructure using Elastic Stack (ELK), built real-time notification systems with Apache Kafka, and implemented CI/CD pipelines for continuous delivery.
Tech: ASP.NET Web API, C#, Elasticsearch, Logstash, Kibana, SQL Server, Apache Kafka, MSMQ.
C#
Elasticsearch
MSMQ
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C#
Elasticsearch
MSMQ
Kibana
Logstash
Load Testing
.NET
ASP.NET
Performance Optimization
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Technical Lead
Better Technology Labs
2006-12-01-2017-01-01
Spent 10+ years at this product company, progressing from developer to Technical Lead. Built PicBackMan — a cross-platform photo/video ba...
Spent 10+ years at this product company, progressing from developer to Technical Lead. Built PicBackMan — a cross-platform photo/video backup utility used by tens of thousands of users in 130+ countries, featured by Wall Street Journal and other top publications.
Led the full product lifecycle: architecture, development, testing, and deployment. Worked extensively with .NET, Windows Forms, Xamarin (Mac), SQLite, Azure, and C#. Also built and maintained internal tools, APIs, and automation systems that powered the company's product suite.
ASP.NET
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ASP.NET
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PROJECTS
Extract data from Accord Form 25 through OCR
2018
Built a custom OCR pipeline to extract structured data from Accord Form 25 (insurance certificates). Used Tesseract OCR with C# and WinFo...
Built a custom OCR pipeline to extract structured data from Accord Form 25 (insurance certificates). Used Tesseract OCR with C# and WinForms to parse scanned PDF documents, identify form fields, and extract key data points into structured output. Handled image preprocessing, noise reduction, and field-level extraction logic for high accuracy across varied scan qualities.
C#
WinForms
OCR
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C#
WinForms
OCR
PDF Text Extraction
ASP.NET
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PicBackMan — Cross-Platform Photo & Video Backup UtilityView Project
2014
Built and launched PicBackMan — a cross-platform desktop application that backs up photos and videos from your computer to cloud storage ...
Built and launched PicBackMan — a cross-platform desktop application that backs up photos and videos from your computer to cloud storage services (Google Photos, Flickr, SmugMug, Dropbox, etc.). Used by tens of thousands of users across 130+ countries. Featured by Wall Street Journal and other major publications. Built the full product lifecycle from architecture to deployment, including multi-threaded upload engines, resumable transfers, duplicate detection, and cloud API integrations. Tech: C#, .NET, WPF, WinForms, Xamarin (Mac), SQLite, Azure.
C#
WPF
SQLite
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C#
WPF
SQLite
.NET
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