I Built A $25K/Month Subscription Billing SaaS For B2B Companies
Who are you and what business did you start?
Hi, I'm the founder of SubscriptionFlow, a SaaS platform that simplifies subscription and usage-based billing for modern businesses. We primarily serve B2B SaaS companies, fintechs, and any business with recurring revenue models especially those navigating complex pricing tiers, metered usage, or hybrid billing scenarios. Our primary customers are product and finance teams at growth-stage companies who need to launch, iterate, and scale their billing without engineering bottlenecks.
What makes SubscriptionFlow special is our flexible billing engine combined with revenue automation we handle everything from subscription lifecycle management and usage metering to dunning, revenue recognition, and analytics in one platform. Unlike rigid legacy systems, we're API-first and built for product-led growth, letting companies experiment with pricing without code changes. Today we bring in around $20K/month in recurring revenue.
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How do you come up with the idea for SubscriptionFlow?
The idea for SubscriptionFlow came from seeing how difficult it was for businesses to manage subscription billing as they grew. We noticed that companies often had to piece together multiple tools for subscriptions, invoicing, payments, usage-based billing, and revenue management, and the complexity became even greater when they introduced different pricing models or started selling to larger customers.
The “aha” moment was realizing that billing wasn't just a back-office function—it was becoming a core part of how modern businesses monetize their products. As SaaS and other businesses moved from simple monthly subscriptions toward usage-based, tiered, prepaid, and hybrid pricing, we saw an opportunity to build a platform that could handle that complexity in one place.
Our background in software, technology, and building products for businesses gave us a strong understanding of the technical and operational problems involved in billing. We validated the idea by speaking with businesses, studying how they were managing billing in practice, and paying close attention to the problems they repeatedly encountered with existing solutions. Early customers helped validate the need further by using SubscriptionFlow to manage real subscription and billing workflows and giving us feedback on what they needed next.
What made the idea stand out from other opportunities was the combination of a large, recurring market and a problem that becomes more valuable to solve as a company grows. We believed that if we could make complex billing significantly easier and more flexible, SubscriptionFlow could become critical infrastructure for subscription businesses rather than simply another SaaS tool.
How did you launch SubscriptionFlow and get initial traction?
We launched SubscriptionFlow by building the product around the billing problems we were seeing firsthand and then getting it in front of businesses that were already struggling with subscription management. Rather than waiting until everything was perfect, we started talking to potential customers early, demonstrating the product, and using their feedback to improve the platform.
Our initial growth was largely driven by direct conversations, referrals, and reaching businesses that needed a better way to manage subscriptions and recurring billing. The response was encouraging because the problem was easy for our target customers to understand—they were often dealing with multiple systems, manual processes, complicated pricing, or limitations in their existing billing setup. Those early conversations helped us understand which features were genuinely valuable and which assumptions we needed to change.
Our first customers were particularly important because they didn't just generate revenue; they helped shape the product. We worked closely with them to understand their billing workflows and built solutions around real-world requirements rather than trying to guess what the market wanted. That customer-driven approach became an important part of how we continued developing SubscriptionFlow.
One of our biggest lessons from the launch was that building a good product is only one part of building a business. You also need to understand the customer's problem deeply, communicate the value clearly, and be willing to adapt based on what customers actually do rather than what you expect them to do.
Looking back, we would keep the same focus on talking directly to customers and learning from early users. If we were launching again, we'd start those conversations even earlier and invest sooner in repeatable acquisition channels. The launch taught us that there is a big difference between having a product that solves a problem and building a business around that solution—and that the fastest way to close that gap is to stay close to customers.
What was the growth strategy for SubscriptionFlow and how did you scale?
We have grown SubscriptionFlow by combining organic search, content marketing, direct outreach, partnerships, and customer referrals. Because billing is a problem that businesses actively search for when they have outgrown their existing systems, SEO and educational content have been particularly valuable for reaching companies already looking for solutions around subscription billing, recurring payments, usage-based billing, invoicing, and subscription management.
SEO became an important long-term channel because we could create content around specific problems rather than simply promoting the product. We focused on topics such as subscription billing, usage-based pricing, metered billing, SaaS metrics, recurring revenue, payment failures, invoicing, and alternatives to established billing platforms. This helped us attract people at different stages of the buying journey, from companies researching a problem to businesses actively comparing billing platforms.
We also used direct outreach to get in front of potential customers, particularly businesses with more complex billing requirements. Instead of leading with a generic sales pitch, we focused conversations on their existing billing process—how they charged customers, how they handled upgrades and downgrades, usage, invoices, failed payments, and integrations. This approach helped us understand the customer's real problem and demonstrate where SubscriptionFlow could make a difference.
One strategy that worked particularly well was focusing on specific use cases and customer problems instead of trying to market SubscriptionFlow as a solution for everyone. For example, a company looking for "usage-based billing" has a very different problem from a company looking for basic subscription management. Creating content and sales conversations around those specific needs made the value proposition much clearer and brought in more qualified prospects.
The biggest lesson we've learned is that sustainable growth comes from combining short-term customer acquisition with long-term organic channels. Direct outreach can help you learn quickly and generate early opportunities, while SEO, content, partnerships, and referrals can compound over time. The key is to measure which channels bring customers—not just traffic or leads—and then invest more heavily in the channels that consistently produce high-quality accounts.
For aspiring entrepreneurs, our advice is to get very specific about the customer and problem you're solving. Don't try to be everywhere at once. Pick a few channels where your customers actually spend time, learn what messaging resonates with them, and keep improving it. Most importantly, stay close to customers as you grow. The best marketing insights often come from understanding why someone bought, why someone didn't buy, and what problem they were trying to solve in the first place.
What were the biggest lessons learned from building SubscriptionFlow?
Building SubscriptionFlow has taught us that building a great product is only half the challenge. The harder part is continuously understanding customers, adapting to a changing market, building the right team, and staying focused long enough for the work to compound.
One mistake we made early on was trying to solve too many problems at once. When you're building a billing platform, there are endless features customers can ask for, and it's tempting to build everything. Over time, we learned to distinguish between what one customer wants and what will create lasting value for a large group of customers. That discipline has helped us prioritize much better.
Another lesson was that enterprise software requires patience. Sales cycles can be long, integrations can be complicated, and customers often need a high level of trust before moving a critical business process onto a new platform. We learned that winning the customer isn't just about having more features—it is about reliability, support, responsiveness, security, and proving that you will be there when something goes wrong.
One of the best decisions we've made is staying close to customers. Customer conversations have influenced our product roadmap, positioning, and even how we think about the market. Instead of assuming we know what businesses need, we try to understand how they actually operate and where their existing processes break down.
The timing has also helped. The subscription economy has matured significantly, while newer models such as usage-based pricing, prepaid credits, and hybrid billing have become increasingly common. The growth of AI has accelerated this shift because AI businesses often need to bill for tokens, API calls, compute, or other forms of consumption alongside traditional subscriptions. Being in the billing space while these changes are happening has created opportunities that didn't exist in the same way when we started.
Perhaps the most important lesson is that persistence is a competitive advantage. There are many moments in a startup when progress feels slower than expected. We've learned to focus on solving the next important problem rather than becoming discouraged by everything that still needs to be done.
A habit that has helped us is constantly asking: "What is the customer actually trying to accomplish?" That question sounds simple, but it prevents you from becoming too focused on features. Customers don't buy billing software because they want another dashboard—they buy it because they want to launch a pricing model, get paid accurately, reduce manual work, or scale their business without billing becoming a bottleneck.
Our advice to other entrepreneurs is to talk to customers more than you think you need to, start selling earlier than feels comfortable, and don't confuse activity with progress. Traffic, features, meetings, and followers can all look like growth, but ultimately you need to understand what creates real customer value and revenue.
We also see entrepreneurs underestimate how important focus is. It's easy to chase every new trend, competitor, or opportunity. The companies that last are often the ones that can say no to good opportunities so they can concentrate on the great ones.
Most importantly, don't expect the journey to be linear. There will be mistakes, unexpected challenges, missed opportunities, and periods where things don't go according to plan. That's normal. The goal isn't to avoid every mistake; it's to learn quickly, avoid repeating the same mistake, and keep moving forward.
If there's one thing we'd want other entrepreneurs to take away from our journey, it's this: build something people genuinely need, stay relentlessly close to your customers, and give the business enough time to compound. The problems that look difficult today can become your biggest competitive advantage tomorrow if you keep solving them better than everyone else.
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More about SubscriptionFlow:
Who is the owner of SubscriptionFlow?
Kashif Saleem is the founder of SubscriptionFlow.
When did Kashif Saleem start SubscriptionFlow?
2019
How much money has Kashif Saleem made from SubscriptionFlow?
Kashif Saleem started the business in 2019, and currently makes an average of $300K/year.
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