About Tapaya

Every card reader, POS terminal, and checkout counter could one day be replaced by a smartphone. The industry is shifting and we're the fastest way for developers to be ready.

Tapaya is drop-in payment acceptance that turns any device into a payment terminal. For developers who need to ship fast without becoming payments experts. We handle compliance, acquirer connections, and device compatibility - so builders stay focused on what they're actually building.

We serve small development and product teams building mobile apps that need in-person payments: reservation systems, POS platforms, gym apps, merchant tools. Our SDK integrates in 30 minutes, not 12–18 months. Compliance? Handled. Now let's talk about what we're building next.

The Role

Tapaya is looking for a Backend Software Engineer to build the payment engine at the heart of our infrastructure - the system that processes real money for real users.

You'll join as a founding engineer on a greenfield codebase, with no legacy debt and no inherited technical decisions to undo. The backend you build will directly power every transaction that flows through Tapaya, and it needs to be fast, secure, and compliant from day one.

You'll work closely with the founding technical team and across cloud infrastructure and mobile SDK.

The mission is clear: build a payment backend so reliable, so clean, and so well-architected that it can scale to support payment acceptance globally - without ever becoming the bottleneck.

What You'll Build

• Cloud-native payment backend in C# with modern ASP.NET Core, processing real transactions at production scale

• AWS-ready application architecture leveraging EKS, EC2, VPC, RDS, CloudWatch, and more - built to run reliably in the cloud from the start

• Security and compliance by design - applying OWASP and PCI best practices so the product is certifiable, not patched after the fact

• AI-assisted development done right - you'll use AI coding tools to move faster, with the judgment to know when the output is good and when it isn't

Who You Are

Must-haves:

• Solid, hands-on C# experience with modern ASP.NET Core

• At least some prior experience with cloud services (AWS or equivalent)

• Comfortable with Git and collaborative source code management

• Strong written and verbal communication in both Czech and English

• You take ownership of outcomes, not just tickets - you care that the system works, not just that the PR merged

Bonus:

• Experience with payment systems, financial backends, or high-compliance environments

• You already use AI agents to move faster and know how to validate what they produce

💡 You don't need a fintech background. But you do need the instinct to build things right, because this backend handles real people's money.

Conditions & Benefits

• Type: Full-time

• Location: Prague, on-site

• Schedule: Flexible - we care about output, not hours

• ESOP: Founding engineer equity, real skin in the game

• Benefits: MultiSport card, small high-caliber team, full autonomy over your function

• Salary: To be discussed - we're transparent and fair

Interview Process

1. Technical & vibe check with our CISO (~30–45 min) - backend depth, architecture thinking, and a chance to get to know each other

2. Founder call with our CEO (~30 min) - mission fit and long-term vision

At Tapaya, you won't be maintaining someone else's 10-year-old codebase. You'll be one of the first engineers shaping a platform that could redefine how payments are accepted globally - and you'll do it from day one.

Think it's a fit? Let's talk, even if you don't tick every box.