We build secure, compliance-ready fintech platforms for payments, lending, wallets and banking.
Money software is held to a higher bar than ordinary apps. A retried request must never move funds twice, a balance can never silently change, and every action has to leave an audit trail your assessor can read. We build with double-entry ledgers, AES-256 encryption, PCI-aware tokenization and idempotent payment flows from the first commit. You own the source code on delivery. See where the numbers land in our custom software development cost guide.
What every fintech build includes
Fintech software development is building applications that move and manage money: payments, lending, wallets and banking. What sets it apart is the engineering behind the money, double-entry ledgers, idempotent transactions, encryption and audit trails, plus compliance-ready practices like PCI-aware tokenization. Timeline Digital builds these platforms end to end for clients in the US, UK, UAE and beyond. A fintech MVP takes about 20 weeks, starts at $50,000 against a fixed scope, and ships with the full source code in your hands.
Security in fintech is not a feature you add at the end. It is the shape of the architecture. We start by deciding what regulated data your product is allowed to hold and, more often, what it should never hold at all. Card numbers get tokenized through a provider like Stripe or Adyen, so raw card data never reaches your servers and most of your PCI DSS scope disappears. Everything that does live on your systems is encrypted with AES-256 at rest and TLS in transit, with secrets kept in a managed vault rather than in code.
On top of that sits the part auditors care about most: an immutable, append-only audit log that records every balance change, login, refund and admin action with who did it and when. High-value operations require maker-checker approval, so no single account can move money or change a limit unchecked. KYC and AML screening run through vetted providers wired into onboarding. We do not claim certifications we cannot verify. We build to compliance-ready standards, document the controls, and hand you an architecture your assessor can sign off.
Four phases. The secure foundation comes before any feature, and a working demo lands at the end of every sprint.
Before code, we map the money flows, the regulated data, and the threat model. We decide where card data lives (or does not), which provider handles KYC, and what audit trail every transaction must leave. You sign off the architecture and the compliance scope in writing.
We stand up the encrypted data layer, the authentication, the role model and the immutable audit log first, then prove them with tests. Security is built into the foundation, not bolted on after a feature works.
Two-week sprints with a working demo each. Ledgers, payment flows, reconciliation, statements and dashboards get built with idempotency and double-entry accounting from the first commit, so a retried request never moves money twice.
Penetration testing, load testing under transaction spikes, a final security review, then a staged go-live with monitoring and alerting. You receive the full source code, the deployment runbook and the audit documentation.
Fintech covers a wide range, and each product type has its own hard part. We build across the spectrum and design each one around the money flow and the rules that govern it.
Many of these sit alongside a wider system. If you also need internal operations tooling, see our custom ERP software work, or read how we scope a build end to end on our process page.
Fintech starts higher than ordinary apps because of the ledger, security and compliance work. Fixed scope, fixed quote, you own the code.
| Stage | What it includes | Typical range | Timeline |
|---|---|---|---|
| Fintech MVP | One money flow, KYC, ledger, secure foundation, audit log | $50,000 to $90,000 | About 20 weeks |
| Full platform | Multiple rails, lending or wallet logic, back-office, reconciliation | $90,000 to $180,000 | 5 to 8 months |
| Scale build | Multi-product, mobile apps, advanced controls, high transaction load | $180,000 and up | 8 months and up |
Ranges depend on the number of payment rails, compliance scope and integrations. Tell us your scope and we will give a fixed quote.
A fintech software development company builds the software that moves and manages money: payment platforms, lending systems, digital wallets, banking apps and the ledgers behind them. The work goes beyond normal app building because the code handles regulated data, real funds and strict audit requirements. Timeline Digital builds fintech products end to end with compliance-ready practices, encryption, double-entry ledgers and audit trails designed in from the first commit, not added later.
We design with PCI-aware practices: cardholder data is tokenized through a vetted provider so raw card numbers never touch your servers, data is encrypted with AES-256 at rest and TLS in transit, and secrets live in a managed vault. Every balance change and admin action writes to an immutable audit log, and high-value operations need maker-checker approval. We map your compliance scope up front and build to it. We do not claim certifications we cannot verify; we build to compliance-ready standards your auditor can sign off.
We build payment platforms and gateways, lending and loan-origination systems, digital wallets, neobank and banking dashboards, billing and subscription engines, and reconciliation tools. We also build the unglamorous parts that decide whether a fintech survives audit: double-entry ledgers, statement generation, dispute handling and reporting. Whether you are launching a new product or modernizing a legacy banking system, we scope the build around the money flows and the regulations that govern them.
Fintech builds start higher than ordinary apps because of the security, ledger and compliance work. A focused fintech MVP with one core money flow, KYC and a ledger typically runs from $50,000 and up. A full platform with multiple rails, lending logic, admin tooling and reconciliation runs from $90,000 and into six figures. We give a fixed quote against an agreed scope rather than an open-ended bill, and you own the source code on delivery.
A fintech MVP with one core flow, KYC, a ledger and a secure foundation takes about 20 weeks with a senior team. The extra time over a normal MVP goes into the secure foundation, the audit trail and the reconciliation testing that money software needs. Larger platforms with multiple payment rails, lending and full back-office tooling run several months longer. We agree the scope in writing before starting so the date is real.
If your product touches card data you fall under PCI DSS, but the scope depends on how you handle that data. By tokenizing cards through a provider like Stripe or Adyen, most of the cardholder data stays out of your systems, which shrinks your compliance burden to the smallest level. We design the architecture so card numbers never land on your servers, keep audit-ready logs, and document the controls your assessor will ask for. The certification itself is yours to obtain; we build so you can pass it.
Bring us the money flow and the regulations it has to live under. We will map the threat model, agree a fixed scope, and build the secure foundation before any feature ships. You own the code and the audit documentation, start to finish.