Can I build a Groww clone app without spending a huge budget?

I'm planning to launch a stock trading platform and have been researching the best way to build it without a huge early on investment. From what I've learned, starting with an MVP (Minimum Viable Product) and adding advanced features over time seems like a smart approach for startups and growing businesses.
My goal is to create a secure, scalable app while keeping development costs under control. I believe careful planning and prioritizing essential features can make this possible.
I'd love to hear from entrepreneurs or startup founders who have built a trading or fintech app. What approach worked best for you? Did you start small and scale later, or invest in a full featured product from the beginning? Any tips, lessons learned, or recommendations would be greatly appreciated.
I'm also interested in hearing if working with an experienced groww clone app development company helped you achieve better results within your budget.