Fintech Platform Development
FISTA Solutions builds the platform behind financial products: double-entry ledgers that reconcile, payment orchestration across processors, lending origination and servicing, onboarding with KYC and AML, and the reporting your partners, auditors, and regulators will eventually request.
- 150+
- projects delivered
- 50+
- companies served
- 99.9%
- verified uptime
- 47%
- efficiency gains
- 12+
- countries reached
What we build
What does fintech platform development include?
Fintech platform work covers the ledger and money model, payment orchestration with failover, onboarding and compliance workflows, product logic such as lending or wallets, reconciliation, and reporting for partners, auditors, and regulators.
- 01
Ledger and money model
Double-entry ledger with idempotent postings and property-tested invariants, because balances must be exact.
Core - 02
Payment orchestration
Multi-processor routing, retries, failover, refunds, and chargeback handling with clear states.
Payments - 03
Onboarding and compliance
KYC, sanctions screening, monitoring, and case management with defensible evidence retained.
Compliance - 04
Product logic
Lending, wallets, cards, or payouts implemented against the ledger rather than alongside it.
Product - 05
Reconciliation and reporting
Automated reconciliation against processor and bank files, with partner and regulatory reporting.
Assurance
Requirements
Which requirements shape fintech platform development?
Fintech platforms must be exactly right about money and able to prove it later. Requirements cover ledger correctness, replayable decisions, PCI scope control, reconciliation that catches divergence, and reporting that satisfies partners and examiners.
| Requirement | Why it matters | How FISTA builds to it |
|---|---|---|
| Ledger correctness | Balances and settlements must be exact. | Double-entry ledger with idempotent postings, property-based tests on invariants, and immutable history. |
| Replayability | Regulators and partners ask what happened. | Versioned rules and models with retained inputs, so any decision or balance can be reproduced exactly. |
| PCI scope | Card data pulls you into audit scope. | Tokenization and provider-side storage by architecture, with in-scope components documented. |
| Reconciliation | Divergence is inevitable without it. | Automated reconciliation against processor and bank files with break investigation and exception queues. |
| Reporting obligations | Partners and regulators require specific reports. | Reporting built from the ledger with lineage, rather than assembled manually from exports. |
Where AI fits
Where does AI fit in fintech platform development?
AI fits fintech platforms in operations rather than authorization: reconciliation break investigation, document extraction for onboarding and underwriting, dispute packet assembly, and AML narrative drafting — with every posting and decision authorized by a human.
- 01
Reconciliation investigation
Breaks investigated against processor and bank files with proposed entries for approval.
- 02
Onboarding document extraction
Identity and financial documents extracted with citations and confidence thresholds.
- 03
Dispute assembly
Representment packets assembled from transaction and communication evidence for analyst approval.
- 04
AML narrative drafting
First-pass narratives and related activity assembled for investigator review and decision.
Cost and timeline
How much does fintech platform development cost, and how long does it take?
Cost is driven by money-movement paths, product complexity, and compliance evidence; timeline by processor, bank, and vendor onboarding. FISTA does not quote blind: the scoping call returns a ledger design, a specification, and a phased estimate.
The ledger is where money platforms are won or lost. Building it correctly early is far cheaper than discovering reconciliation gaps after volume arrives, and FISTA treats it as the first deliverable rather than an implementation detail.
Partner onboarding is the schedule. Processors, sponsor banks, and compliance vendors run their own timelines, and the platform cannot launch ahead of them, so discovery maps and dates each one.
Send the scope you have, even if it is a paragraph. You get a written brief, an architecture sketch, and a phased estimate before any commitment.
Get a scoped quoteDelivery
How does FISTA deliver custom software?
FISTA delivers custom software in four phases: a discovery sprint that turns goals into a specification with acceptance criteria, an architecture and data design with integration contracts, two-week builds with automated tests and weekly demos, and a verified release with infrastructure-as-code, runbooks, and monitoring.
- 1
Discover and specify
Workshops, process mapping, and system inventory produce a specification with acceptance criteria and a phased plan.
OutputSpecification, estimate, roadmap
- 2
Architect
Data model, service boundaries, API contracts, security, and infrastructure decisions recorded with trade-offs.
OutputArchitecture decision records
- 3
Build and demo
Two-week sprints with unit, integration, and contract tests; a demo on your environment every week.
OutputWorking increments in your repo
- 4
Verify and release
Performance and security testing against the spec, infrastructure-as-code, runbooks, dashboards, and handover or managed operations.
OutputVerified release with SLOs
Why FISTA
Why choose FISTA Solutions for fintech platform development?
FISTA builds fintech platforms on a correct ledger with replayable decisions and minimal PCI scope, with reconciliation designed in rather than added after the first discrepancy. Work is contracted through a US entity with full IP assignment.
Fintech Platforms specifics
- The double-entry ledger with property-tested invariants is the first deliverable, not a later refactor.
- Rules, models, and inputs are versioned and retained, so any balance or decision can be replayed for an examiner.
- PCI scope is minimized architecturally through tokenization and provider-side storage, with in-scope components documented.
- Automated reconciliation against processor and bank files runs from launch, with exception queues owned by a person.
How FISTA engineers
- Spec-Driven Development: every deliverable starts as a written specification with acceptance criteria, so scope is testable before it is built.
- AI-native delivery: engineers direct coding agents under review gates and evaluation harnesses, compressing build time without loosening verification.
- Official Anthropic partner, with production experience across Claude, OpenAI, Google, and open-weight models, chosen per workload rather than by default.
- One accountable delivery lead, weekly demos on your environment, and code in your repositories from week one.
What you get as a client
- 150+ projects delivered for 50+ companies across 12+ countries since 2017, with 99.9% verified uptime on systems we operate.
- A US entity (FISTA Solutions Inc., Wilmington, Delaware) for contracting, invoicing, and IP assignment, with an engineering center in Faisalabad, Pakistan for cost-efficient senior capacity.
- US business-hours overlap for standups and reviews; written decision logs so nothing depends on a meeting you missed.
- Flexible engagement: fixed-scope build, embedded forward deployed engineers, or a dedicated team that you can scale month to month.
Clear answers
What buyers ask before a custom build.
Straightforward guidance for evaluating scope, fit, and the next step.
01Should we build a ledger or use a ledger product?
Build when your balance semantics, product logic, or reporting needs are unusual; integrate a product when it fits. The decision is made in discovery against your reconciliation and regulatory needs and recorded with its trade-offs.
02How do you keep PCI scope small?
Through tokenization and provider-side card storage so raw card data never touches your systems, with the remaining in-scope components documented for your assessor.
03Can AI operate inside a money platform?
In operations, yes: reconciliation investigation, document extraction, dispute assembly, and AML narrative drafting. Postings, payments, and adverse decisions require human authorization.
04How do you handle reporting for partners and regulators?
Reports are built from the ledger with lineage to source records, so figures are reproducible rather than assembled manually from exports that nobody can re-derive.
05How long does a fintech platform take?
A focused platform typically takes a few months of engineering, with processor, bank, and compliance vendor onboarding usually determining the actual launch date.
Scoped in writing before you commit
Build the ledger before you build the product.
Bring the financial product and your partners. The scoping call returns a ledger design, a specification, and a phased estimate.