API Development & Integration for Fintech
Modernize financial infrastructure with secure, scalable APIs built for high-transaction environments and open banking standards.
Challenges in Financial Services Connectivity
Financial institutions face significant pressure to expose data securely while maintaining absolute system integrity. The shift toward Open Banking and the demand for real-time transactions force organizations to move beyond legacy monolithic architectures. However, poor banking api development strategies often lead to security vulnerabilities, latency issues during peak trading hours, and data silos that hinder customer experience.
Fintech leaders must balance speed-to-market with strict regulatory oversight. Navigating this environment requires engineering partners who understand not just the code, but the specific constraints of the financial sector.
Our Approach to Fintech API Development
Unosquare builds fintech api development solutions rooted in security-first architecture. We decouple complex legacy systems into manageable, scalable microservices. Our engineers implement robust API Gateways that handle authentication, rate limiting, and traffic management, ensuring your core banking systems remain protected while external applications interact seamlessly.
We utilize standardized protocols (REST, GraphQL, gRPC) and secure authentication methods (OAuth 2.0, OIDC, mTLS) to guarantee that every data packet is verified. By integrating automated testing pipelines, we ensure that new feature deployments never disrupt critical financial operations.
What We Deliver
Open Banking Implementation
Develop APIs that comply with PSD2 and other open banking standards, allowing secure third-party integration.
Legacy System Wrapping
Create modern interface layers over mainframes or older core banking systems to enable digital transformation without full re-platforming.
Payment Gateway Integration
Seamless fintech api integration for payment processors, ensuring real-time settlement and reconciliation.
Real-Time Fraud Detection
Integrate data streams with machine learning models to identify and block suspicious transactions in milliseconds.
KYC/AML Identity Verification
Connect with global identity databases to automate customer onboarding and compliance checks.
Financial Services Compliance & Security Standards
Security is not an add-on; it is foundational to our engineering process. Our teams operate within strict governance frameworks tailored for financial services apis.
- PCI-DSS: Ensuring secure handling of cardholder data during transmission and storage.
- SOC2 Type II: Verified internal controls regarding security, availability, and processing integrity.
- GLBA: Adherence to privacy provisions for financial institutions.
- Encryption Standards: Implementation of FIPS 140-2 validated encryption for data at rest and in transit.
Flexible Partnership Models
We align our engagement models with your specific project lifecycle and compliance needs. Learn more about our delivery structures on our services page.
Capacity Augmentation
Inject senior API engineers into your existing teams to accelerate backlog clearance or handle specific integration tasks.
Dedicated Teams
Deploy a fully managed squad focusing on a specific product module, such as a mobile banking backend or trading algorithm interface.
Outcome-Based Delivery
Entrust us with end-to-end delivery of a specific API product, from architecture design to final deployment and documentation.
Why Fintech Leaders Choose Unosquare
Read more about our corporate philosophy and history on our about page.
- Domain Expertise: We do not just code; we understand ledgers, reconciliation, and transaction lifecycles.
- Nearshore Alignment: Our teams in Mexico, Colombia, and Bolivia work in US time zones, enabling real-time collaboration on complex architectural decisions.
- 98% Client Retention: Our consistency in delivery builds long-term trust with major financial institutions.
- Talent Density: With over 1,000 professionals, we quickly source engineers with specific Fintech stacks (Java, .NET, Python, Go).
Frequently Asked Questions
How do you ensure security during API development?
We adhere to DevSecOps practices. Security testing (SAST/DAST) is integrated into the CI/CD pipeline. We enforce strict access controls, use token-based authentication, and encrypt all sensitive data payloads.
Can you integrate with our existing legacy banking core?
Yes. A core strength of our fintech api integration service is wrapping legacy systems (like AS/400 or mainframes) with modern API layers, exposing functionality to web and mobile apps without destabilizing the core.
Are your developers trained in financial compliance?
Our Fintech Center of Excellence ensures engineers are trained in relevant standards such as PCI-DSS and OWASP Top 10 vulnerabilities specific to financial applications.
How quickly can we scale a team?
Our nearshore model allows us to deploy qualified engineers faster than domestic hiring. Typically, we can onboard engineers within 2-4 weeks depending on the specific stack requirements.
Ready to Transform Your Financial Operations?
Secure, scalable, and compliant API solutions are within reach. Let’s discuss how we can help with your fintech api development needs.