Transaction & Wallet Systems

Money movement is where “mostly working” stops being good enough. Nika builds transaction and wallet systems that stay correct under concurrency, reconcile to the cent, and leave an audit trail you can defend.

Every balance has to add up. Every time, under any load.

What we do

Ledger & wallet engines

• Double-entry ledgers and balance engines

• Multi-currency wallets and accounts

• Idempotent, exactly-once transaction processing

• High-throughput debit/credit under contention

Integrity & reconciliation

• Automated reconciliation and settlement

• Consistency guarantees and conflict resolution

• Immutable audit logs and event sourcing

• Dispute, chargeback, and adjustment flows

Risk, fraud & integrity

• Real-time rules engines and velocity checks

• Behavioral anomaly and fraud detection

• Limits, holds, and approval (maker-checker) workflows

• Sanctions / watchlist screening hooks

Integrations

• Payment provider and PSP orchestration

• Webhooks, callbacks, and retry/backoff

• Reporting and finance exports

• API platforms for partners

How we engage

We begin with the invariants — what must always be true about your balances — and build outward from there, with tests and reconciliation baked in. You get a system that finance, engineering, and auditors can all trust.