Microservices Architecture for UK FinTech — FCA PS21/3 Built In
ClickMasters provides Microservices Architecture for UK FinTech businesses with FCA PS21/3, FCA Consumer Duty compliance from Sprint 1.
Key Highlights
Compliance
+2 more standards
Pricing
Microservices Architecture for FinTech — UK Specifics
FCA PS21/3 Operational Resilience and Microservices
FCA Operational Resilience (PS21/3) requires firms to set Impact Tolerances for Important Business Services (IBS) and test that they can remain within those tolerances during severe but plausible disruption. Microservices architecture should map each IBS to specific services: payment processing → payment microservice SLAs, account access → identity and account services. Each microservice must have defined SLAs that support the IBS Impact Tolerance.
Circuit Breakers for FCA Operational Resilience Evidence
Microservices without circuit breakers can cause cascading failures — one slow service causes all dependent services to queue and fail. Circuit breaker pattern (Resilience4j for Java, opossum for Node.js): when downstream calls fail above threshold, the circuit opens and fast-fails requests, preventing cascade. FCA PS21/3 operational resilience testing: circuit breakers are direct evidence of fault isolation capability.
Distributed Transactions in FinTech Microservices
FinTech microservices frequently need distributed transactions: debit from account A AND credit to account B must both succeed or both fail. Options: Saga pattern (choreography or orchestration) — each service publishes events and compensating transactions roll back on failure. Two-phase commit (2PC) — avoid for microservices (too slow). ClickMasters uses Saga orchestration for FinTech payment flows — the orchestrator has the full audit trail required for FCA transaction reporting.
PCI-DSS Scope in FinTech Microservices
PCI-DSS scoping in microservices: only services that process, store, or transmit cardholder data are in-scope. Design principle: minimise scope by isolating cardholder data to a dedicated payment microservice using hosted payment fields (Stripe Elements/Adyen Drop-in). All other microservices communicate with the payment service via tokens — cardholder data never touches out-of-scope services.
Compliance
FCA PS21/3
FCA Consumer Duty
PSD2
UK GDPR
Cyber Essentials
PCI-DSS
Compliance & Regulations
Every solution we build for this industry is designed to meet the following regulatory and standards requirements.
FCA PS21/3
FCA Consumer Duty
PSD2
UK GDPR
Cyber Essentials
PCI-DSS
Investment Options
Flexible engagement models tailored to your fintech project requirements.
£40,000–£200,000
Full engagement
- Industry-specific approach
- UK GDPR compliant
- Dedicated technical lead
£3,500–£8,000
Scoping
- Industry-specific approach
- UK GDPR compliant
- Dedicated technical lead
from £1,500/mo
Post-launch
- Industry-specific approach
- UK GDPR compliant
- Dedicated technical lead
What Our Clients Say
Success stories from clients in fintech industry.
“ClickMasters transformed our digital infrastructure. Their understanding of UK fintech regulations saved us months of compliance work.”
Sarah Mitchell
CTO, FinTech Solutions Ltd
“The team's expertise in NHS integrations and DTAC compliance was invaluable. They delivered on time and within budget.”
Dr. James Cooper
Medical Director, HealthFirst UK
“Their grasp of FCA requirements and insurance sector nuances helped us launch our platform 40% faster than expected.”
Michael Brooks
CEO, InsureTech Pro
Frequently Asked Questions
Common questions about fintech software development.
How does FCA PS21/3 affect microservices architecture decisions?
FCA PS21/3 Impact Tolerances drive microservices design: each Important Business Service maps to specific microservices, and those services' SLAs must support the IBS tolerance. Design implications: redundant service deployment (minimum 2 instances per critical service), circuit breakers to prevent cascade, health check endpoints per service for monitoring, and chaos engineering tests to validate resilience claims.
How do we handle UK GDPR right to erasure in FinTech microservices?
Pattern: a dedicated PII Erasure Service orchestrates erasure across all data stores. Each microservice registers its personal data stores with the Erasure Service. On erasure request: Erasure Service broadcasts ErasureRequested event, each service implements its own erasure handler (delete/anonymise), and confirms completion. The Erasure Service maintains a compliance audit trail with per-service completion timestamps. FCA consideration: some FinTech transaction data must be retained for 5–7 years under Money Laundering Regulations — erasure applies to non-mandatory personal data fields only.
Related fintech Services
FinTech Software Development UK — FCA, Open Banking & Regulated FinTech Builds
Custom Software Development for UK FinTech Companies — FCA Compliant
MVP Development for UK FinTech Companies — FCA Sandbox Compliant
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Let us engineer a platform that meets your industry regulations, serves your users, and scales with your ambitions.