Build vs buy core banking
Building a core banking system in-house gives you total control — and a multi-year, multi-million commitment to get ledger correctness, KYC, payments, and compliance right, then maintain them forever. Buying a platform trades some control for speed and shared, battle-tested infrastructure. Here is an honest look at the trade-off.
| Dimension | Sika | Building in-house | Edge |
|---|---|---|---|
| Time to production | Weeks | Typically 18–36 months for a safe v1 | Sika |
| Upfront cost | Subscription — no build cost | A large engineering + compliance investment | Sika |
| Ledger correctness | Double-entry, idempotent, reconciliation-tested | You must build and prove it yourself | Sika |
| Compliance tooling | KYC, AML, audit, maker-checker included | Built and maintained by your team | Sika |
| Mobile money & payments | Native, multi-provider | Integrate and maintain each rail yourself | Sika |
| Ongoing maintenance | Handled by Sika, ships to all tenants | A permanent engineering cost centre | Sika |
| Total control / customisation | Modular, but opinionated | Unlimited — it is your codebase | Alt. |
| Differentiation | Compete on product & service, not plumbing | Own IP if the core itself is your edge | Even |
A fair comparison — each option’s genuine strengths are noted, not just Sika’s.
Choose Sika when…
- Your edge is your product, market, and service — not the plumbing
- You need to launch fast and preserve capital
- You do not want to own ledger, KYC, and payments correctness forever
- You want compliance controls out of the box
Choose building in-house when…
- The core banking engine itself is your primary IP and differentiator
- You have deep, funded platform engineering and years of runway
- You need customisation no platform can accommodate
Launch your institution on Sika
From application to a live, compliant bank in weeks, not years.
Build vs buy core banking: FAQ
Should I build or buy core banking software?
Buy when your differentiation is your product, market, and service, and you want to launch fast without owning ledger, KYC, and payments correctness forever. Build only when the core engine itself is your primary IP and you have deep, funded platform engineering. For most banks, MFIs, and fintechs, buying a platform like Sika is faster and far cheaper.
How much does it cost to build a core banking system?
A safe, compliant in-house core typically takes 18–36 months and a large engineering and compliance investment, then a permanent maintenance cost. A subscription platform removes the build cost and the ongoing maintenance burden.
What do I give up by buying instead of building?
Unlimited customisation and full code ownership. Sika is modular but opinionated; if the core banking engine itself must be your unique IP, building may be justified.
Launch your institution on Sika
From application to a live, compliant bank in weeks, not years.