K4 Tech Solutions

K4 Tech Solutions is a product-focused development agency specializing in fintech and mobile products. We build neobanks, PCI DSS-compliant payment platforms and mobile apps end to end — from hypothesis to launch.

Across 30+ delivered projects we work with startups and fintech teams that need production-grade software shipped on a startup timeline — senior engineers only, direct access to the people building your product. Our stack covers backend (Node.js, NestJS, Express), frontend (React, Next.js, Angular) and mobile (Swift, Kotlin, Flutter) for iOS, Android and cross-platform.

How we work: transparent process, weekly demos, structured deliverables. Clients stay involved at every milestone with full visibility into progress — no black boxes, no budget surprises. Every project ships with one month of free post-launch support.

Typical engagements: MVP development for fintech startups, mobile app development, payment and banking integrations, and modernization of existing platforms.

Founded in 2024. We work remotely with clients across Europe and North America.