We deliver legacy app modernization built specifically for fintech — covering incremental modernization, business logic preservation, and data migration. From regulatory compliance to fintech-specific workflows, our team ships production systems that meet the demands of the financial technology and banking sector.
ZTABS provides custom legacy app modernization for FinTech — addressing regulatory compliance (PCI dss, SOX, KYC/AML) and real-time transaction processing. We build solutions tailored to the financial technology and banking sector using technologies like Next.js, React, Node.js. Get a free consultation →
Senior legacy app modernization engineers serving FinTech run roughly $130–$185/hr. Stack realities for this combination: Plaid + Stripe + Marqeta core; Snowflake + dbt for finance data; Datadog + Splunk for SOX/PCI logging — common integrations: Plaid / Yodlee account aggregation, Stripe / Adyen card processing, Marqeta / Galileo card issuing. PCI-scoped subnet isolation; encrypted PAN at rest; tokenization service
2026 modernization: AWS App Modernization, Azure Modernization Hub, GCP Migrate. Strangler-pattern with API gateway (Kong, AWS API Gateway). Code-translation: GitHub Copilot Workspace, IBM watsonx Code Assistant for COBOL, Sonatype Lift for refactoring. Static analysis: SonarQube, CodeScene. Modernization engineers need legacy-language fluency (COBOL, VB6, ColdFusion are still in production globally), API design discipline, and stakeholder-management skill (the people who built the legacy system are usually still there and skeptical). Pure-greenfield engineers fail at this.
We understand the unique demands of the financial technology and banking sector and build solutions that address them head-on. With a market size of $556B projected by 2030, the FinTech sector demands technology partners who truly understand the industry.
Financial software must navigate a complex web of regulations. PCI DSS governs payment card data, SOX requires financial controls, and KYC/AML regulations demand identity verification and transaction monitoring. Non-compliance can result in loss of banking partnerships and significant fines. For legacy app modernization engagements, addressing this at the architecture level from day one keeps it from compounding later.
Modern fintech platforms must process thousands of transactions per second with sub-millisecond latency. Users expect instant transfers, real-time balance updates, and immediate payment confirmations — any delay erodes trust and drives users to competitors. For legacy app modernization engagements, addressing this at the architecture level from day one keeps it from compounding later.
Financial fraud costs the industry $32 billion annually. Platforms need real-time transaction monitoring, ML-powered anomaly detection, device fingerprinting, and multi-factor authentication — all without creating friction that drives legitimate users away. For legacy app modernization engagements, addressing this at the architecture level from day one keeps it from compounding later.
Global fintech products must handle currency conversion, international wire transfers, cross-border regulatory compliance, and varying payment methods across markets. Exchange rate management and settlement timing add complexity to every transaction. For legacy app modernization engagements, addressing this at the architecture level from day one keeps it from compounding later.
Source: Mordor Intelligence
The FinTech industry is undergoing rapid digital transformation. Companies that invest in purpose-built technology solutions gain a measurable competitive advantage over those relying on generic off-the-shelf tools.
Before investing in custom legacy app modernization for FinTech, document your top 3 operational pain points with specific metrics. This ensures the solution targets real bottlenecks — not assumed ones.
Our team brings deep FinTech domain knowledge combined with technical excellence to deliver solutions that work in the real world — not just in demos.
We build payment systems with end-to-end encryption, tokenization, secure key management, and network segmentation. Our code undergoes security reviews aligned with PCI DSS requirements to protect cardholder data at every layer. This is a core part of every legacy app modernization engagement we deliver.
We architect systems using event-driven microservices, message queues, and CQRS patterns that handle high-throughput transaction processing with the reliability and speed that financial services demand. This is a core part of every legacy app modernization engagement we deliver.
Our fintech solutions include multi-factor authentication, biometric verification, real-time fraud scoring, device fingerprinting, and comprehensive audit trails that satisfy both regulators and security teams. This is a core part of every legacy app modernization engagement we deliver.
We build platforms that scale from startup to millions of users: horizontal scaling, database sharding, caching strategies, and CDN optimization ensure your platform grows without performance degradation. This is a core part of every legacy app modernization engagement we deliver.
Modernize one module at a time — reducing risk, delivering value early, and keeping the business running throughout.
We extract and document the business rules embedded in legacy code so nothing gets lost in the new system.
Migrate from legacy databases (Access, FoxPro, SQL Server) to modern PostgreSQL or cloud-managed databases.
Build modern REST or GraphQL APIs that let the new system talk to legacy components during the transition period.
Create comprehensive test suites that verify the new system behaves identically to the old one for every critical workflow.
Deploy the modernized application on AWS, Azure, or Vercel with CI/CD pipelines, monitoring, and auto-scaling.
Here are some of the most common legacy app modernization projects we deliver for FinTech businesses:
Build digital banking apps with account management and mobile check deposit using legacy app modernization
Develop peer-to-peer payment platforms with instant settlement using legacy app modernization
Implement investment and robo-advisor platforms with portfolio management using legacy app modernization
Deploy lending platforms with automated underwriting and credit scoring using legacy app modernization
Launch cryptocurrency exchange and wallet applications using legacy app modernization
Design expense management and corporate card platforms using legacy app modernization
Every FinTech legacy app modernization project we deliver includes compliance verification at each phase — from architecture design through deployment and ongoing maintenance.
Relevant regulations: Fintech companies must comply with PCI DSS for payment data, SOX for financial reporting, KYC/AML for identity verification, GLBA for consumer financial privacy, and various state money transmitter licenses. International operations add GDPR, PSD2 (EU), and country-specific financial regulations.
We implement row-level security, encryption at rest and in transit, and role-based access controls for FinTech data. Audit trails log every access and modification for regulatory review.
FinTech systems we build use VPC isolation, encrypted secrets management, and automated vulnerability scanning. For AI features, we add PII redaction in prompts and on-premise model hosting when required.
Compliance is tested, not assumed. We run automated checks for FinTech regulatory requirements at every CI/CD stage — so compliance issues are caught before code reaches production.
Post-launch, we monitor for compliance drift with automated alerts on access patterns, data flows, and configuration changes. Quarterly compliance reviews are included in our maintenance agreements.
Our FinTech legacy app modernization team actively builds for these trends: The global fintech market is projected to reach $556 billion by 2030. Key trends include embedded finance (BaaS), AI-driven credit scoring, decentralized finance (DeFi) integration, open banking APIs, buy-now-pay-later (BNPL) platforms, and real-time payment rails replacing legacy batch processing.
Talk to us about applying these trends to your FinTech project →
Verified reviews from Fintech clients and adjacent verticals — sourced from our public testimonial archive and Clutch profile.
My experience is throughout positive. Communication, service, the short response times and the flawless execution of a challenging topic was absolutely great. ZTABS is definitely my first choice again.
Christian Neff
Bank Software Advisory · Bank Software Advisory
Fintech
We don't just contract — we ship and operate our own software. 17 products in production.
Common questions about legacy app modernization for FinTech
The FinTech industry has unique requirements including regulatory compliance (PCI dss, SOX, KYC/AML) and real-time transaction processing. Off-the-shelf solutions often can't address these specific needs. Custom legacy app modernization ensures your solution is tailored to FinTech workflows and compliance requirements. The $556B projected by 2030 market size reflects the massive opportunity for companies that invest in purpose-built technology.
We serve FinTech businesses worldwide. Find legacy app modernization in your city:
We deliver legacy app modernization built specifically for healthcare — covering incremental modernization, business logic preservation, and data migration. From regulatory compliance to healthcare-specific workflows, our team ships production systems that meet the demands of the healthcare and medical technology industry.
Legacy App Modernization for Real EstateWe deliver legacy app modernization built specifically for real estate — covering incremental modernization, business logic preservation, and data migration. From regulatory compliance to real estate-specific workflows, our team ships production systems that meet the demands of the real estate and property technology sector.
Legacy App Modernization for EducationWe deliver legacy app modernization built specifically for education — covering incremental modernization, business logic preservation, and data migration. From regulatory compliance to education-specific workflows, our team ships production systems that meet the demands of the education technology and e-learning industry.
Web Development for FintechWe deliver web development built specifically for fintech — covering full-stack development, progressive web apps, and api development. From regulatory compliance to fintech-specific workflows, our team ships production systems that meet the demands of the financial technology and banking sector.
Web Design for FintechWe deliver web design built specifically for fintech — covering ui/ux design, responsive design, and custom interfaces. From regulatory compliance to fintech-specific workflows, our team ships production systems that meet the demands of the financial technology and banking sector.
AI Development for FintechWe deliver AI development built specifically for fintech — covering llm integration & fine-tuning, ai agents & automation, and rag & knowledge systems. From regulatory compliance to fintech-specific workflows, our team ships production systems that meet the demands of the financial technology and banking sector.
Hire Next.js DevelopersPre-vetted Next.js talent with 4+ years avg. experience.
Hire React DevelopersPre-vetted React talent with 5+ years avg. experience.
Get custom legacy app modernization tailored to the financial technology and banking sector. Free consultation included.
