Building developers who can ship real products.
Sagnik Bhattacharya is the founder of Coding Liquids and a top-rated Udemy instructor who has taught Flutter, Dart, and Excel with AI to over 30,000 students across 175 countries since 2018. He creates project-based courses that help students and working developers build production-ready skills. He also works one-to-one with small and medium-sized businesses, self-employed people, startups and solo founders as an AI implementation consultant, putting AI to work on the jobs that slow them down.
Hands-on learning built for real product work.
Sagnik Bhattacharya founded Coding Liquids in 2018 to bridge the gap between academic theory and production-ready software development. The company delivers project-based online courses in Flutter, Dart, and Excel with AI, and one-to-one AI implementation consultation for small and family-run businesses and growing teams.
His courses on Flutter, Dart, and Excel with AI have reached over 30,000 students across 175 countries, first on Udemy, where he holds Top Rated instructor status, and now on Coding Liquids. Every course is built around shipping something real, not following along with a demo. His free Flutter tutorials and Excel tutorials follow the same approach.
His newest course, The Complete Excel Course with AI Integration, is co-taught with Virginia Thorn, Primetime Emmy Award winner: 16 hours of hands-on lessons on the workbooks companies actually run on, from budget vs actual dashboards, clean HR data, Power Query and DAX models to macros and VBA, with Copilot, ChatGPT and Claude built into the workflow. The first lessons are free to preview.
Sagnik's teaching approach combines active AI implementation work with education — every course is grounded in real delivery experience. The focus is on understanding architecture, tooling, debugging, and deployment well enough to build production software with confidence.
AI implementation consultation for small and medium-sized businesses and the self-employed. Sagnik's AI Implementation Consultation is a one-to-one service for small and medium-sized businesses, self-employed people, startups and non-profits that want AI doing useful work. On the first call he looks at where the week goes, which tools the business already runs, and which jobs are worth handing to AI first, so the owner leaves knowing what AI they can actually use in their business rather than sitting through a lesson on how AI works. Most small businesses, whether a local shop, a clinic or an online store, don't need a data team or a big AI budget. They need the right two or three things automated first: the reporting that eats a Friday afternoon, the support inbox nobody gets to, the spreadsheet only one person understands. Sagnik works one-to-one with owner-operators to find those jobs, put AI on them — workflow automation, AI inside the tools and apps you already run, or a plain-English AI strategy for what to build first — and hand over something the team can run. No agency, no hand-off, no sales team. Tell him what slows your business down and he'll tell you what AI you can actually use and where it genuinely pays off.
That advice comes from shipping AI products himself. He has built licensable white-label agricultural advisory products for governments, NGOs, cooperatives, and agri teams including Farm Advisor AI (18 languages) and Kisan Salahkaar (64 languages), both featuring AI farm advice, AI plant doctor diagnosis from images, organic and inorganic product suggestions, soil test report analysis, nearby crop prices, accessible voice chat, and multilingual support.
Frequently asked questions
What do you do for small and medium-sized businesses and the self-employed?
I show them what AI they can actually use in their business, through a one-to-one AI Implementation Consultation. It isn't a lesson. Most small businesses don't need a data team or a big AI budget; they need the right two or three jobs automated first. I find those jobs, show which tools can do them, put AI on them with workflow automation or AI inside the tools they already run, and hand over something the team can keep running.
Which kinds of businesses do you work with?
Mostly small and medium-sized businesses, self-employed people, startups and solo founders, but also freelancers, agencies, clinics and practices, online stores, professional-services firms and non-profits. Bigger teams are welcome too. The sector matters less than the work: if your week has reporting, support emails, documents or data entry that keep repeating, there is usually a job AI can take on.
What exactly do you offer?
Two things. Project-based courses, led by The Complete Flutter Course and The Complete Excel Course with AI Integration, for people who want to build things themselves. And the one-to-one AI Implementation Consultation, for business owners who want to know what AI they can actually use in their business and have it working for them. Both are grounded in real delivery work rather than theory, and you deal with me directly for either.
What AI have you actually built?
Two multilingual AI farm advisors that are live today: FarmAdvisor AI, in 18 languages, and Kisan Salahkaar, in 64. Both handle AI crop advice, plant diagnosis from photos, soil test report analysis and voice chat. Building and running them is where the advice in my consultations comes from, alongside teaching Flutter and Excel with AI to over 30,000 students since 2018.