Custom Fintech Software Development for Payments and Platforms
PilotLab is a custom fintech software development company for startups and scaling financial platforms. We build payment systems, ledgers, lending products and embedded finance features with accuracy, security and audit trails built in from day one.
How Fintech Software Development Gets Money Movement Right
In fintech, a bug is not a broken button; it is money in the wrong place. Fintech software development demands double-entry ledgers, idempotent APIs, reconciliation against bank and processor records, and clear handling of every failure state. We bring these patterns to every fintech engagement, from seed-stage MVPs to platforms preparing for scale.
Our API and platform engineering team designs payment flows across card networks, ACH, RTP and FedNow, wires and wallets, while our database design work keeps balances consistent under heavy concurrency. The usage-based billing engine in our case studies is one example of this approach in production. Every money movement is modeled as explicit states with clear owners, so operations teams know exactly what happened when a payment is returned, disputed or delayed.
Speed matters too. Fintech founders need to launch, win partner banks and pass due diligence quickly. We scope MVPs that prove the business without cutting corners on security or compliance. Our fintech platform development guide walks through architecture choices, and our guide to SaaS subscription billing with Stripe covers recurring revenue. We help you decide what to build, what to buy from infrastructure providers and what to defer until volume justifies it.
Fintech Engineering Challenges We Solve
Ledger accuracy and reconciliation
Balances drift when systems update in place. We build append-only double-entry ledgers and automated reconciliation against processor, bank and card network reports.
PCI DSS scope and data security
Storing card data expands audit scope and risk. We use tokenization and hosted fields to keep raw card data out of your systems wherever possible.
Integrating multiple payment rails
ACH returns, card disputes, instant payments and wires each have different timing and failure modes. We model them explicitly so funds flows stay predictable.
Partner bank and investor due diligence
Sponsor banks and investors scrutinize controls. We document architecture, access, monitoring and compliance workflows so reviews do not delay launch.
Fintech Products We Build
We build the core systems that make fintech products trustworthy, from transaction processing to customer-facing apps.
Payment processing platforms
Pay-ins, payouts, split payments and merchant onboarding across processors and rails, with retries, webhooks and dispute handling.
Double-entry ledgers
Immutable ledgers with account hierarchies, holds, multi-currency support and real-time balances that reconcile to external records.
Billing and subscription engines
Usage metering, invoicing, proration, dunning and revenue reporting for API-first and SaaS business models.
Lending and credit platforms
Application, decisioning, servicing, repayment schedules and collections for consumer, SMB and buy-now-pay-later products.
Embedded finance and wallets
Stored-value wallets, card issuing programs and banking features embedded in your product through BaaS partners.
Fraud and risk tooling
Rules engines, velocity checks, device signals and AI-assisted risk scoring with analyst review queues.
Fintech Compliance Standards We Build For
PilotLab builds software that supports the standards fintech companies and their partner banks must meet. We provide the technical controls and evidence; licensing and compliance programs remain with your team.
PCI DSS
Software that handles cardholder data must protect it, limit access and minimize scope, ideally through tokenization and hosted payment fields.
NACHA Operating Rules
ACH products must handle authorizations, return codes, account validation and data security as the rules require.
BSA/AML and KYC
Onboarding and transaction flows need identity verification, sanctions screening, monitoring and records that support suspicious activity reporting.
SOC 2
Partner banks and enterprise customers often expect SOC 2 reports, so systems need documented access control, change management and monitoring.
State money transmitter requirements
Products that hold or move customer funds must support licensing obligations such as recordkeeping, reporting and safeguarding of funds.
Fintech Software Use Cases
- Payment gateways and payouts
- Usage-based billing
- Digital wallets
- Card issuing programs
- SMB and consumer lending
- Expense management
- Fraud detection
- Treasury and cash management
Services for Fintech Companies
Custom SaaS Development
End-to-end SaaS products with auth, billing, analytics and admin built in.
API & Platform Engineering
REST and GraphQL APIs, webhooks, SDKs and developer portals.
Cloud Security & DevOps
CI/CD, infrastructure as code, observability and compliance-ready security.
Database Design
Schema design, data modeling and query optimization for SaaS workloads.
Insights for Fintech Teams
Fintech Platform Development: Ledgers, Payments and PCI DSS
A technical guide to fintech platform development: double-entry ledgers, payment APIs, idempotency, reconciliation, PCI DSS scope reduction and regulatory requirements.
PostgreSQL vs MySQL vs MongoDB: Which Database for SaaS?
Compare PostgreSQL, MySQL and MongoDB for SaaS applications across data modeling, multi-tenancy, scaling, managed hosting and AI workloads, with a practical decision framework.
SaaS Subscription Billing with Stripe: Best Practices
How to implement SaaS subscription billing with Stripe Billing, Checkout, the Customer Portal and webhooks, plus proration, dunning, Stripe Tax and idempotency.
Fintech Software: Frequently Asked Questions
How much does fintech software development cost?
Cost depends on the money flows, number of integrations and compliance scope. A focused fintech MVP usually takes 8-12 weeks, and production hardening with partner bank requirements, reconciliation and security reviews typically takes 12-20 weeks. We recommend a short discovery phase to map funds flows and regulatory needs before committing to a fixed estimate.
Do I need my own ledger or can I rely on my payment processor?
Processors track their own records, not your business logic. If you hold balances, split payments, issue credits or reconcile across multiple providers, you need your own double-entry ledger as the source of truth. It makes reconciliation, reporting and audits far easier and lets you switch or add processors without rewriting your product.
How do you keep a fintech platform PCI DSS compliant?
We minimize scope first. Using processor-hosted fields, tokenization and network tokens keeps raw card numbers out of your infrastructure, often reducing the assessment burden significantly. Where card data must be handled, we isolate it in segmented environments with strict access, encryption and logging. Your qualified assessor confirms compliance; we build software designed to pass that review.
Which payment rails and providers do you work with?
We build on card networks through processors such as Stripe and Adyen, ACH, wires, RTP and FedNow through bank and BaaS partners, and wallet providers. We design an abstraction layer so your product logic is not tied to one provider. That makes it easier to add rails, negotiate pricing and fail over when a provider has an outage.
Can you help us prepare for partner bank due diligence?
Yes. We produce architecture diagrams, funds flow documentation, access control descriptions and monitoring evidence that sponsor banks typically request. We also build compliance workflows such as KYC, sanctions screening and transaction monitoring into the product early, so due diligence reviews working software rather than plans.
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