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Six practices.
One accountable EU team.

TrustChange builds and scales regulated digital-asset products. Crypto-native engineering depth meets regulated-industry delivery discipline. That pairing is rare in one partner. We take the work from discovery through architecture, build, compliance hardening, launch and 24/7 support.

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Practice areas

What we build

The full digital-asset stack, held to one architecture and security standard. Pick a practice to see the detail.

  • 01 Exchange core

    Crypto exchange development

    Order books that stay correct under load. Ingress, risk and matching run as separate services. A trading day can be replayed from the event log.

    • Price–time priority book
    • Pre-trade risk checks
    • FIX, REST and WebSocket ingress

  • 02 Custody

    Wallet & custody engineering

    Hot, warm and cold tiers with key handling an auditor can follow. Threshold signing covers operating balances. Reserves sit behind air-gapped multi-sig.

    • MPC / TSS threshold signing
    • Written key ceremonies
    • Withdrawal policy engine

  • 03 Payments

    Payment gateway engineering

    Card, SEPA and crypto rails behind one ledger. Every movement is double-entry and idempotent. Retries never mint money twice.

    • PSD2-aware flows
    • Double-entry ledger
    • Reconciliation jobs

  • 04 On/off-ramp

    On/off-ramp integration

    Fiat in, crypto out, and back again. We wire banking partners, liquidity venues and KYC vendors into one quote-to-settlement path.

    • Quote and rate locking
    • Partner failover
    • Settlement reporting

  • 05 Platform

    Fintech infrastructure

    The plumbing under the product. Core banking links, ledgers, queues and observability, built so an on-call engineer can find the answer fast.

    • Event-driven services
    • Audit-grade logging
    • 24/7 support handover

  • 06 Regulatory

    Compliance engineering

    MiCA, PSD2 and GDPR handled in code, not in a slide deck. Travel Rule messaging, screening hooks and evidence trails ship with the feature.

    • Travel Rule messaging
    • AML screening hooks
    • GDPR data mapping

Engagement models

How you buy the work

Same engineers, same standard. Only the commercial shape changes.

Fixed-scope product build

Best whenA defined product with a launch date

ShapeDiscovery, architecture, build, hardening, launch

OwnershipTrustChange owns delivery

Dedicated development teams

Best whenA roadmap that outruns your headcount

ShapeA standing EU squad with its own lead

OwnershipShared roadmap, our delivery process

Staff augmentation

Best whenOne skill gap inside a working team

ShapeSenior engineers inside your rituals

OwnershipYou own the backlog

CTO advisory

Best whenA build or licensing decision to de-risk

ShapeArchitecture review, threat model, plan

OwnershipYou own the call, with our evidence

Delivery

Five steps, every time

The sequence does not change with the engagement model. It is what keeps a regulated build predictable. No step gets skipped for a deadline.

  1. Discovery

    We map the product, the rails and the licence you sit under. You get a scope, a risk list and a cost range.

  2. Architecture

    Topology, data model and key handling get written down first. Regulatory constraints shape the design, not a later patch.

  3. Build

    Two-week increments against a public board. Every merge runs tests, static checks and a dependency scan.

  4. Hardening

    Load tests, failure drills and a third-party pen test window. Findings are fixed before launch, not logged for later.

  5. Launch & run

    Cutover with a rollback path, then 24/7 support. Runbooks and dashboards are handed to your team on day one.

Standards

What ships with the code

Regulated delivery is an evidence job. These artefacts are part of scope, not extras.

  • MiCA-ready architectureDesign notes mapped to the rules you are licensed under
  • AML & Travel RuleScreening and messaging wired into the transfer path
  • GDPR by designData map, retention rules and EU-hosted processing
  • SOC 2 & PCI DSS readinessControls and logs prepared for the audit you plan next

Need the regulatory view first? Read our compliance approach, or browse solutions by product type.

Next step

Tell us what you are building

One call is enough to scope it. We will tell you the shape, the risks and the model that fits. If we are the wrong partner, we say so.

Book a discovery call [email protected]