WislaCode Solutions is a fintech integration engineering firm. We connect banks and B2B fintech platforms to their clients, partners and providers, without replacing the core. Registered in Warsaw, contracted under EU jurisdiction. Every new bank, payment provider, lender or acquirer that wants to connect to your platform is an integration, and each one pulls engineers off the roadmap. That is the work we take on: payments, lending, KYC and AML, open banking and BaaS, built around the systems you already run. Each engagement has one named technical lead, accountable for the work reaching production, and ends in a documented handover. We work inside your repository, CI and identity provider. The source code, mapping logic, tests and runbooks stay with your team, documented well enough to run without us. The founders have worked in banking and payments software for over 20 years. WislaCode Solutions was registered in Warsaw in 2023. In production: a banking super app with 1.5M+ installs, where online lending grew 150x in a year. A migration that moved 1.5M+ existing customers from a legacy core to digital banking, without disruption. Payment platforms processing GBP 10M+ a day. For payabl., an Android payment SDK in production in one month. For $lana (Monetech), a credit PWA live in Mexico inside the regulatory window. The contracting entity is WislaCode Solutions PSA, KRS 0001062722, Warsaw, Poland. Capacity beyond the core team comes through a contracted partner network, with delivery locations disclosed per engagement. Bank work is under NDA, described by sector and scope; named references come in a review call. If an integration is stuck, or the next one is already on the critical path, write to info@wislacode.com. We will look at it in a 30-minute call and tell you what it takes to get it live, and what we would not take on.