Regulated systems engineering

Regulated systems needtraceable decisions.

Seypro modernizes and extends financial platforms where access, transaction history, reconciliation, and operational evidence have to remain explainable.

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Quick answer

Seypro builds regulated financial infrastructure — trading and order-management connectivity, settlement workflows, KYC/KYB/AML onboarding, and the reconciliation infrastructure that surfaces mismatches before they hit a client statement. We built and run the platform behind MERJ Exchange, a regulated national securities exchange with five connected public, investor, issuer, and administrative platform surfaces.

Published engagement evidence.

18+ moIn production

0Critical incidents

135Jurisdictions served

99.9%Platform uptime

Case study · In production

MERJ Exchange — modernization across five connected platform surfaces.

The engagement spans public markets, investor and issuer workflows, administration, market data, and compliance tooling. Seypro has delivered incrementally alongside the MERJ team within a regulated operating environment.

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Engineering teardowns

What “audit-grade” actually means in production.

A regulated system is not one that never has problems. It is one where problems are caught, diagnosed, and closed before a client, a regulator, or a board finds them first. These are incident teardowns from live production work.

Symbol-mapping mismatch — caught before client statements

critical

On a live securities exchange we operate, a symbol-mapping mismatch between two subsystems meant trades were filling but wallet postings were silently failing. We detected the discrepancy, built a live converter, and closed the gap before it reached a single client statement.

Market-feed silent death — root cause identified and closed

high

A market-data feed was dying silently for ~24-hour windows. The failure had been attributed to network issues for months. We traced it to a stuck connection-state flag in the feed process that the reaper logic never cleared. One targeted fix; recurring incident closed.

Redis stream bloat — multi-GB trimmed live without downtime

high

Unbounded market-data streams in Redis had no retention cap, and production memory was filling incrementally. We trimmed gigabytes to under 300 MB live and shipped a producer-side cap to prevent recurrence — zero downtime, zero data loss.

What we build

Every layer a regulated platform requires.

Not a capabilities menu — the parts a regulator, auditor, or board actually inspects, built as one platform.

Trading & order management

Order management systems, execution connectivity, real-time market data, and broker/venue integration. Built on FIX protocol. Tested under production load.

Settlement & reconciliation

Real-time settlement, custodial accounting, and reconciliation logic that surfaces mismatches before they reach a client statement. Every transaction is traceable.

KYC / KYB / AML

End-to-end onboarding flows with identity verification, AML screening, sanctions checks, and audit trails on every action — built to the controls a regulator inspects.

Audit-grade infrastructure

Message queues with failover, idempotent processing, encrypted data exchange, and the monitoring that proves uptime. ISO 27001-aligned controls on production systems.

Incident diagnosis

When something goes wrong in a regulated system, every hour of ambiguity has a cost. We diagnose at the source-code level — not by restarting services and hoping.

Reconciliation tooling

Automated reconciliation jobs that diff what the platform says against what the counterparty says — and surface the delta before a human has to find it manually.

Interactive · synthetic data

Walk through a compliant onboarding, step by step.

Active liveness, ICAO 9303 document verification, fuzzy sanctions and PEP screening, and a hash-chained audit trail built from what the run actually emits. Fictional subject, specimen document, invented list records — no client system appears in it.

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MERJ Exchange · production record

Zero critical incidents across 18+ months in production — trading, settlement, KYC/AML, and reconciliation running concurrently on a national securities exchange serving 135 jurisdictions.

MERJ ExchangeNational securities exchange · 135 jurisdictions

Who calls us

The buyer who has been burned by a web agency pretending to do fintech.

CTO / Head of Engineering

You need an exchange or settlement engine built right, not bolted together from vendor SDKs that fail during reconciliation.

Head of Compliance

Your regulator is asking how your audit trails work. You need an engineer who can answer at the source-code level, not just show them a PDF.

Fintech Founder

You are raising or going live in a regulated jurisdiction and need a technical partner who has already cleared this bar — not a team learning fintech on your budget.

One next step

Building something the regulator will read?

Tell us what you are building and the jurisdiction you answer to. Exchange, broker, payments institution, fund platform — we have cleared the bar before.

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