Financial software development company
Financial Software Development Services
Custom financial software for banks, credit unions, asset managers, lenders and finance teams: core operational systems, data and reporting platforms, billing and accounting, and modernization of the legacy software they run on.
Case study 5 days → 15 min account opening time at a top-7 U.S. credit union with $19B in assets Digital onboarding platform with automated KYC/KYB 
Case study 99.95% availability after modernizing a legacy platform for 450K+ investors WealthTech modernization for an SEC-registered adviser 
Case study 2 weeks → 4 hours credit memo preparation with privacy-safe AI underwriting Supply chain finance platform for a commercial lender - 13+years in fintech engineering
- 300+fintech projects delivered
- 250+clients in 23 countries
- 150+experienced engineers
- 4.9on Clutch, 40 reviews
Built for and integrated with
Custom software for financial institutions
A financial software development company for systems that cannot fail
Financial software carries money, records and regulatory obligations. Downtime, a failed integration or an inaccurate report has a direct cost. As a finance software development company, Itexus has built and modernized these systems since 2013, for organizations ranging from funded startups to a credit union with $19B in assets.
We design for the properties financial institutions are audited on: data integrity, traceability of every critical action, controlled releases and recovery paths. And we do it without freezing the business — legacy systems are replaced gradually, with new components running alongside the old.
- Accurate financial data models — data engineers who model transaction, portfolio and market data correctly
- Legacy coexistence — service wrappers and integration layers around AS400, SOAP and file-based systems
- Auditability by default — audit trails, activity logging and regulatory reporting designed in
- Delivery ownership — one accountable team in multi-stakeholder environments
Financial software solutions
Custom financial software we develop
Financial services software development, from customer-facing platforms and financial applications to the internal systems that finance, risk and operations teams work in every day.
Banking and credit union software
Digital channels and operational systems connected to the core.
- Online and mobile banking
- Digital onboarding with KYC/KYB
- Core banking integration
Financial data and analytics platforms
Real-time data streaming, processing, reporting and visualization.
- Data aggregation and normalization
- Dashboards and regulatory reports
- Predictive models and forecasting
Billing, invoicing and accounting software
Automation of the order-to-cash cycle for B2B businesses.
- Invoicing and payment processing
- Financial reconciliation
- Tax and crypto-asset accounting
Investment and wealth management software
Systems for advisers, asset managers and investors.
- Portfolio management and analytics
- Robo-advisory
- Adviser and client portals
Lending and credit software
Origination, underwriting and servicing.
- Loan origination workflows
- Credit scoring SaaS
- AI-assisted credit memos
Trading software
Front-to-back systems for brokers and investment firms.
- Trading terminals and mobile apps
- Order management
- Algorithmic trading
Payment software
Payment flows embedded in your product or operations.
- Gateways and processor integrations
- Wallets and transfers
- B2B payments
Insurance software
Policy, claims and distribution systems.
- Policy administration
- Claims automation
- Agent and broker portals
Financial software modernization
Controlled replacement of legacy financial systems.
- Code and architecture audit
- Strangler Fig phased migration
- Automated regression testing
Case studies
Financial software development projects
Custom financial software delivered by Itexus for institutions in the U.S., Europe and Asia.
- 5 days → 15 minaccount opening time at a $19B credit union
- 99.95%availability after modernizing a platform for 450K+ investors
- 30%faster releases after the same modernization
- 7 monthsfrom discovery to launch of a supply chain finance platform
Digital onboarding platform for a top-7 U.S. credit union
Automated KYC/KYB, document verification and instant funding for a $19B credit union, integrated with its legacy AS400 core banking platform.
Legacy platform modernization for an SEC-registered investment adviser
An inherited advisory platform for 450K+ investors, modernized across mobile, web and messaging channels with SEC/RIA-ready records.
AI-based financial data management platform
A data platform with predictive modules for credit cycles, real-time streaming, reporting and visualization for a licensed South Korean fintech serving banks.
Autonomous B2B billing and payments platform
Invoicing, payment processing, KYB verification, reconciliation and back-office synchronization for a global fintech in the B2B payments sector.
Credit scoring SaaS for financial organizations
A SaaS platform that builds mathematical models on historical and non-traditional data to evaluate the solvency of potential borrowers.
Accounting platform for crypto assets
Retrieves data from exchanges and wallets, computes gains, losses and income, and generates the tax reports businesses holding crypto assets need.
Client reviews
What clients say about working with Itexus
Itexus delivered the app according to the requirements. The team met all development milestones and deliverables. They were efficient, friendly, and cooperative. Itexus team was very timely with updates, a regular meeting cadence, and ad-hoc questions and answers via Slack.
Itexus excelled at both experimental AI and sprint-oriented UI/UX tasks. Itexus did strong project management work, too, a necessity in such a complicated project.
The assigned team was easy to work with and they are especially strong collaborators and communicators. They demonstrated flexibility, professionalism, and trust in everything they did, and completed the work on time and budget.
Itexus’ work positions the business well for an imminent launch. They excel at managing their team, presenting frequent product demos to ensure that the project is aligned with development goals. An affordable price structure coupled with remarkable technical skill makes them an attractive partner.
They’re a great group of developers who really understand the reality of business.
- 87%client retention rate
- 75%of clients come through referrals
- 250+clients in 23 countries
- 2013in business since
Awards and recognition
Recognized by independent B2B research and review platforms
ClutchTop B2B Companies, Eastern Europe 2019
GoodFirmsTop App Developers, Belarus
TechreviewerTop Mobile App Developers 2021
TopDevelopersTop Mobile App Developers, USA 2019
SoftwareWorldTop Rated Software Development Companies
SoftwareWorldTop Rated App Development Companies
ITFirmsTop Mobile App Developers 2020
ExpertiseBest Mobile App Development in Miami 2020
SelectedFirmsTop Web & Software Development Company
TopSoftwareCompaniesTop Software Developers
TrustFirmsTop DevOps Consulting Companies
YouTeamTrusted Partner 2017
Scope
Financial software development services
A full-cycle engagement or a specific service — the same senior team and delivery standards either way.
Build
- Custom financial software development
- Financial application development for web and mobile
- Banking and financial software integration
- Data platforms and reporting
- AI and machine learning features
Modernize
- Legacy system audit
- Re-architecture and refactoring
- Cloud migration
- Integration layers for legacy cores
Run
- DevOps and high-availability infrastructure
- Performance and load testing
- Security and penetration testing
- L2/L3 production support
Integrations and stack
Integrations and technology for financial systems
Enterprise-grade platforms and patterns for security, stability and performance.
Core banking and legacy systems
Market and financial data
Credit, KYC and identity
Backend and APIs
Cloud and DevOps
Web and mobile
Security and compliance
Financial software that passes vendor security review
Itexus addresses the questions procurement and security teams ask about access, infrastructure, recovery and continuity with documented and enforced controls.
- Regulatory reportingArchitecture prepared for new controls and reporting logic as regulation changes.
- Segregation of dutiesFine-grained permissions and data segregation for multi-entity and multi-tenant systems.
- Access and identityRole-based access, least-privilege permissions, MFA and strict separation of client environments and data.
- EncryptionAES-256 at rest, TLS 1.2+ / 1.3 in transit, secure credential handling and controlled backups.
- AuditabilityAudit trails and activity logging for critical actions, with data masking for PII.
- ContinuityDocumented backup policies, disaster recovery planning, rollback paths and 24/7 monitoring.
The team
The engineers behind your financial software
Itexus was founded in 2013 by four partners who had spent 20+ years in engineering and management roles at large software companies and startups. Today the team is 150+ people, with development offices in Europe and headquarters in the United States.
- 100software developers
- 11DevOps engineers
- 10QA engineers
- 7UI/UX designers
- 6business analysts
- 6project managers
- 3PhD-level data scientists
How we work
How we develop financial software
Agile flexibility with the scope, budget, risk and delivery governance that regulated financial projects require.
Discovery and blueprints before code
Requirements, architecture, integrations, API contracts and delivery assumptions are defined upfront and updated with every release.
Agile with scope and budget control
Short iterations and demos, combined with controlled scope management, budget tracking, release planning and risk reporting.
AI-first build for new products
With modular architecture, documented requirements and clear guardrails, AI agents accelerate coding and test generation under senior architect review.
AI-accelerated work on legacy systems
For tightly coupled systems with incomplete documentation: AI-assisted analysis, refactoring and test generation with closer manual oversight.
Quality engineering and test automation
Manual and automated QA, regulatory scenario testing, penetration testing, performance and load testing.
Launch and post-launch support
Deployment, monitoring, L2/L3 maintenance and knowledge transfer. Current documentation keeps later changes fast and safe.
Engagement models
Engagement models for financial software outsourcing
Choose the model that fits your requirements, project size and how involved you want to be. Whether you outsource a whole product or extend your own team, the engineers and delivery standards are the same.
Agile with budget control
Agile delivery in two-week sprints combined with strict control of scope, budget, risks and quality.
- High-level scope, estimate and budget defined upfront
- A demo of new features at the end of every sprint
- Requirements can change as new ideas come up
- Weekly reporting on costs and progress
- Only efficient hours within the agreed estimates are billed
Fixed price
All requirements are documented and signed before the project starts. Itexus delivers the agreed scope for the agreed price and time.
- Exact scope and functionality fixed in the contract
- Payments on reaching milestones
- Minor client involvement during implementation
- Suits clients who can specify the software in detail and do not plan to change it
Dedicated team / outstaffing
Remote engineers, with or without a project manager, integrated into your in-house team and managed by you day to day.
- You direct the development process
- Developers, QA, DevOps, designers, data scientists
- Engineers with financial domain knowledge
- Scale the team up or down as the roadmap changes
As a general reference, discovery and prototyping engagements start from around $30,000; enterprise fintech projects often range from $150,000 to $1,000,000+. Compare the cooperation models in detail
Why Itexus
Why institutions choose Itexus as their financial software development company
Financial and AI expertise
- 300+ fintech projects in 23 countries
- Banking, trading, wealth, payments, lending
- In-house AI R&D and fintech competence centers
Accountable delivery
- Ownership of scope, timelines, risks and budget
- Documentation and QA built into delivery
- Transparent reporting and escalation
Practical problem-solving
- Senior input on architecture and integrations
- Legacy modernization experience
- Regulated workflow expertise
Long-term partnership
- 87% client retention rate
- 75% of clients come through referrals
- Teams embedded in client processes
FAQ
Financial software development: frequently asked questions
How much does a financial software development project cost?
The cost depends on scope, architecture, integrations, compliance requirements, product complexity and the condition of any existing systems.
As a general reference, discovery, validation and prototyping engagements start from around $30,000. Enterprise projects involving legacy integrations, regulated workflows, AI functionality or full-scale product development often range from $150,000 to $1,000,000+. Itexus provides a detailed estimate after an initial discovery session and technical scoping.
What is the difference between financial software and fintech software development?
The engineering is the same; the client and context differ. Financial software development usually means systems for established institutions — banks, credit unions, asset managers, insurers — including internal and legacy systems. Fintech development usually means new digital products. Itexus does both, often in the same engagement: for example, a digital onboarding product on top of a legacy AS400 core.
Can you integrate with our core banking system or other legacy software?
Yes. Itexus has integrated with Temenos, FIS, Fiserv and AS400-based cores, including SOAP and file-based protocols. We build clear integration layers so new components can coexist with the legacy system and be rolled out gradually with rollback paths.
Can you take over a project from another financial software development company?
Yes. Itexus takes over stalled, underperforming or poorly documented projects from other vendors.
The work starts with an audit of the codebase, architecture, documentation, integrations, infrastructure and security risks, followed by a remediation plan covering technical debt, testing gaps and the next development priorities.
How do you keep financial data secure?
Role-based access with least-privilege permissions and MFA, AES-256 encryption at rest and TLS 1.2+ in transit, data masking for PII, audit trails for critical actions, network segmentation, documented backup and disaster recovery, and 24/7 monitoring with a formal incident response procedure.
How long does it take to build financial software?
It depends on scope. A discovery and prototype phase typically takes weeks; a production platform with several integrations takes months. As an example, Itexus took a supply chain finance platform from discovery to launch in seven months. We give a timeline with the estimate after discovery.
What is AI-first and AI-accelerated development?
AI-first development is most effective for greenfield products, where the architecture, requirements, documentation and technical guardrails can be designed for agent-based development from the start.
AI-accelerated development is better suited to legacy systems, where tightly coupled architecture and incomplete documentation require more manual analysis, refactoring, test generation and controlled modernization. In both cases Itexus keeps architecture oversight, QA, security and compliance control.
Do you provide post-launch support and maintenance?
Yes. Itexus provides post-launch support and maintenance for production financial systems, including L2/L3 support, monitoring, incident response, patch and release management, performance tuning, backup and rollback support, and ongoing improvements.
Insights
Financial software guides from our engineers
Related services
More fintech services from Itexus
Plan your financial software project with senior engineers
Share the system you need to build or modernize. We will review it and come back with an approach, risks and an estimate.
- 1. Send your project ideaWe contact you to clarify details and requirements, and send an NDA.
- 2. Get the estimate and proposalAfter the project analysis we send a proposal and discuss it with you.
- 3. Project kick-offIn-house engineers are available for a quick start.