Most financial institutions rely on outdated core systems built before mobile apps, cloud, and real-time tech. Reports from McKinsey, Accenture, IBM, and Forbes show that over 70% of banking core systems are 20–40 years old, and that up to 80% of transactions use COBOL. This slows product cycles, raises technical debt, complicates compliance, and raises support costs.
Modernizing core banking is vital for financial institutions to stay competitive. Transitioning to cloud, modular platforms provide a strategic edge: quicker time-to-market, lower costs, enhanced cybersecurity, and faster deployment of new products.
Against this backdrop, there is a growing demand for technology partners capable of updating individual tools and also rebuilding the core of the financial business. Below is a selection of the 15 best fintech software development companies specializing in core banking modernization and helping banks transition from legacy systems to a flexible, future-proof financial infrastructure.
1. Computools
Proof points
- 12+ years building custom software
- 250+ engineers across global delivery hubs
- 400+ products launched for clients worldwide
- 20+ fintech platforms delivered from neobanks and PSPs to crypto, lending, regtech, and investment tech
- ISO 9001 & ISO 27001–aligned workflows and security practices
- Certified Microsoft & AWS partner for secure, cloud-ready architectures
With over 12 years of experience, Computools excels in core banking modernization by developing digital infrastructure for a range of global financial institutions, such as traditional banks, neobanks, PSPs, lending platforms, and investment firms.
Recognized in IAOP’s Global Outsourcing 100 and certified under ISO 9001 and ISO 27001, the company combines enterprise-grade quality with flexible delivery. With 400+ delivered products and 20+ fintech platforms in production, Computools is a long-term engineering partner for institutions modernizing their core systems.
Its fintech software development services cover the full spectrum of core banking transformation: rebuilding legacy systems into modular, API-driven architectures; enabling real-time payment processing; deploying cloud-native core banking engines; and upgrading mission-critical modules such as account management, ledger systems, onboarding, card issuing, loan origination, and risk scoring. Computools also specializes in hybrid modernization models that connect legacy cores with new digital layers, accelerating transformation without service disruption.
Beyond the core itself, the company delivers RegTech components, fraud-detection systems, AI-powered analytics, digital banking apps, and secure financial data pipelines, all built to meet PCI DSS, SOC 2, GDPR, PSD2, DORA, and KYC/AML requirements. Finance companies report up to a 40% improvement in transaction speed and up to a 30% reduction in operational costs after partnering with Computools, confirming its focus on measurable performance, resilience, and long-term value.
2. Kitrum
Proof points
- 8+ years in fintech engineering
- 350+ developers across global hubs
- 200+ delivered fintech modules and features
- Expertise in banking apps, payments, KYC/AML, fraud prevention, and card issuing
- Compliance-ready delivery across GDPR, SEPA, AML, PSD2
Kitrum helps banks, lenders, PSPs, and payment providers upgrade legacy cores, rebuild digital channels, and adopt cloud-native, API-driven architectures. Their teams have delivered fintech products in 29 markets, including digital banking apps, real-time payment engines, card-issuing modules, KYC/AML workflows, cross-border payments, and fraud-resistant transaction pipelines.
Kitrum’s approach blends secure engineering with regulatory precision. The company applies GDPR, SEPA, AML, PSD2, and regional compliance frameworks while implementing biometric authentication, automated onboarding, risk scoring tools, and AI-powered analysis engines. This makes them particularly effective for institutions aiming to modernize outdated systems without disrupting ongoing operations.
3. Ancient
Proof points
- 10+ years in fintech and banking delivery
- 150+ senior engineers across LATAM
- 60+ financial-sector clients in 15+ countries
- Compliance-ready: KYC/AML, PCI, fraud-prevention flows
- 100+ fintech projects shipped
Ancient focuses on fintech infrastructure: digital wallets, card issuing, remittances, payroll systems, and Banking-as-a-Service layers that help financial institutions modernize legacy cores without disrupting daily operations. Their teams combine engineering rigor with deep knowledge of compliance, fraud prevention, payments orchestration, and scalable financial architectures. Through long-term delivery squads, dedicated technical oversight, and proven integrations with partners like Pomelo, STP, Technisys, Trulioo, Circle, and Marqeta, Ancient helps banks and fintechs build secure, resilient, and future-ready platforms that accelerate time-to-market and reduce operational complexity.
4. Synodus
Proof points
- 5+ years accelerating fintech and banking delivery
- 250+ engineers
- 30+ fintech and banking solutions for wallets, payments, ERP for banks, and digital PaaS
- ISO 27001–aligned security and data-handling workflows
Synodus works with major banks across SEA, fintech startups, and global enterprises, delivering scalable digital banking platforms, payment infrastructures, and low-code modernization solutions. The company has already delivered 30+ fintech and banking projects, ranging from e-wallets and payment engines to full ERP/CRM banking systems, while maintaining a 96% client retention rate.
Synodus blends senior engineering talent with deep domain knowledge in payments, compliance, lending, and cloud-native architectures. The team builds systems that handle millions of transactions, integrate with complex banking APIs, and meet industry standards for data privacy and security.
5. Leobit
Proof points
- 10+ years of experience
- 170+ certified .NET, Azure, AI, and QA experts
- 150+ products delivered across lending, insurance, investment, and digital banking
- Microsoft Solutions Partner, ISO 9001 & ISO 27001, ISTQB Gold Partner
Leobit helps financial institutions modernize legacy core banking systems and build secure, high-load fintech products. Leobit has built strong expertise in digital banking, lending, investment platforms, insurance tech, e-wallets, and AI-powered financial applications.
The company upgrades outdated .NET systems, designs cloud-ready architectures, boosts the performance of high-load platforms, and ensures compliance with GDPR, PCI DSS, OWASP, and other financial regulations.
Leobit operates as a full-cycle fintech software provider—from system architecture and UI/UX to integrations with payment gateways, core banking APIs, KYC/AML tools, and AI-driven automation.
6. LeanCode
Proof points
- 9+ years on market
- 80+ engineers
- 65+ projects delivered for global enterprises and scale-ups
- Official Google-listed Flutter Consultant with 2 Google Developer Experts
- Recognized by Forbes, Financial Times 1000, Mobile Trends Awards, and Netty Awards
LeanCode is a Flutter-first engineering partner recognized by Google as an official Flutter consultant, building high-performance financial applications and supporting modernization initiatives across digital banking, payments, onboarding, and customer experience.
LeanCode helps financial institutions accelerate legacy system transformation through secure cross-platform development, scalable backend architectures, PSD2/Open Banking integrations, and robust KYC/KYB/AML workflows. The team leverages Flutter to cut development time by up to 50% while maintaining enterprise-grade security, performance, and compliance, making it a strong choice for banks seeking faster releases without compromising reliability.
7. OAKS LAB
Proof points
- 9 years on the market
- 85+ specialists
- ISO 27001–certified security and delivery practices
- Experience across capital markets, payments, lending, and investment platforms
OAK’S LAB is a custom software development partner that helps banks, fintechs, and capital markets players modernize legacy cores and launch new digital products on a modern JavaScript stack. The team focuses on React.js and Node.js–based web and mobile platforms, event-driven backends, and AI-driven features that sit cleanly on top of or alongside existing banking systems.
Their track record includes capital markets and investment platforms backed by Nasdaq and leading funds, giving them hands-on experience with high-stakes data, security, and regulatory constraints in financial services.
8. Vention
Proof points
- 20+ years of experience
- 3,000+ dedicated developers
- 500+ clients, including PayPal, IBM, Mount Sinai, PwC, and Postman
- $15B+ in client acquisitions powered by Vention-built products
Vention supports product companies, lenders, wealth-tech platforms, and financial institutions across the full lifecycle of digital financial solutions. Their teams build and modernize digital banking modules, payment systems, card issuing platforms, lending and credit engines, wealth-management tools, analytics dashboards, and real-time fraud-prevention systems. The company also designs hybrid architectures, modernizes legacy systems, and integrates advanced AI for risk scoring, anomaly detection, and personalization.
Vention ensures every fintech product meets strict global regulatory requirements including PCI DSS, SOC 2, GDPR, CCPA, PSD2, Open Banking standards, AML/KYC/KYB, and region-specific compliance frameworks.
9. Bluelight
Proof points
- 6 years on the market
- 50–249 engineers
- SOC 2–ready processes and secure cloud-native practices
- Up to 50% faster team ramp-up compared to traditional hiring models
Bluelight is a nearshore engineering partner that helps companies build scalable digital products and accelerate fintech innovation. Operating fully remotely across 6+ countries, the team delivers custom software development, cloud engineering, SOC 2-ready architectures, DevOps automation, data engineering, QA, and AI-driven solutions for startups, mid-market firms, and Fortune 500 enterprises.
For fintech companies, Bluelight provides high-performance engineering teams that build secure, compliant, and high-availability platforms from digital wallets and payment processors to lending systems, KYC/AML workflows, risk-scoring engines, and cloud-native banking components. Their nearshore model enables rapid team scaling, strong time-zone overlap, and faster delivery cycles, while SOC 2-aligned standards ensure enterprise-grade security across every project.
Bluelight combines technical depth with transparent communication and a flexible engagement model, helping financial organizations reduce engineering costs, accelerate roadmap execution, and build products that scale to millions of users.
10. Designli
Proof points
- 10+ years of experience
- 250+ experts
- 200+ five-star reviews across G2, Google, and Clutch
- AI-augmented engineering workflow delivering features up to 30% faster
Designli pairs founders with full-time, multidisciplinary product teams, engineers, product owners, and UX specialists who guide every step from idea validation to scalable release. Their model is built for trust: transparent sprints, human-centric communication, and dedicated teams that behave like in-house cofounders rather than outsourced contractors.
For fintech companies, Designli builds compliant, high-performance platforms including mobile banking apps, payment systems, lending tools, KYC/AML onboarding, subscription billing, and investment interfaces. Whether founders are recovering from a failed build, validating an MVP, or scaling to thousands of users, Designli provides clear roadmaps, clean engineering practices, and AI-empowered development that accelerates delivery by up to 30%.
With a decade of experience and hundreds of product launches, the company is known for turning early ideas into stable, user-tested products that ship on time and scale without breaking.
11. Andersen Inc.
Proof points
- 18+ years of experience
- 3,500+ in-house experts across 18 global locations
- 1,000+ clients worldwide and 350+ financial initiatives delivered
- ISO 9001, ISO 27001, ISO 13485, GDPR, HIPAA, TISAX, and WCAG-aligned delivery processes
Andersen is a large-scale engineering partner for core banking modernization and fintech software development services. The company supports banks, neobanks, lenders, insurers, and investment firms with everything from digital banking apps and payment platforms to trading, lending, and wealth-management systems.
Andersen combines strong domain expertise (FinTech, Banking, Investment, Insurance) with mature delivery processes, fast team ramp-up, and strict compliance with global standards such as GDPR, HIPAA, and ISO.
For financial institutions looking to modernize legacy cores, launch new digital products, or extend in-house teams, Andersen offers end-to-end delivery, staff augmentation, and white-label accelerators, such as its digital wallet and mobile banking app.
12. eSparkBiz
Proof points
- 15+ years on market
- 400+ engineers
- 1,000+ projects delivered across 15+ countries
- 300+ startups and enterprises supported with nearshore/offshore teams
eSparkBiz designs and provides secure, high-performance financial systems that meet stringent regulatory, auditing, and data protection requirements. This includes digital banking apps with end-to-end KYC/AML workflows, payment gateways, card-issuing and billing engines, trading dashboards, investment and portfolio management platforms, lending and credit scoring modules, fraud detection components, and financial analytics systems powered by AI and machine learning.
They specialize in modernizing legacy cores into modular, cloud-native architectures, integrating real-time data pipelines, and ensuring enterprise-grade security (including encryption, identity, and risk controls).
Their engineers build products that pass audits, scale under load, and comply with global finance standards, enabling fintechs and established institutions to launch faster, expand safely, and innovate without operational risk.
13. 99x
Proof points
- 20+ years of experience
- 600+ engineers and product specialists
- Expertise across JS/TS, React, Node.js, Python, Golang, Java, AWS, GCP, DevOps, data & AI
- Trusted partner for financial services, IT, healthcare, and marketing industries
- Nearshore teams aligned by time zone and culture for seamless collaboration
99x is a global software engineering partner with 600+ tech professionals across Norway, Brazil, Portugal, Malaysia, and Sri Lanka. For over 20 years, the company has helped digital product vendors and enterprises accelerate development through product engineering, nearshore tech talent, and end-to-end web solutions.
Their Facilitated Teams model blends deep technical expertise with design, scalability, and long-term product thinking, enabling clients to modernize legacy systems, build cloud-ready architectures, and ship high-quality digital products faster.
With strong competence in JavaScript/TypeScript ecosystems, cloud engineering, DevOps, data, AI, and mobile development, 99x provides reliable capacity, cultural alignment, and the engineering maturity needed to drive sustainable digital growth.
14. BairesDev
Proof points
- 4,000+ senior software engineers
- 100+ technologies and programming languages
- 1,200+ projects delivered since 2009
- 500+ clients, including Google, Adobe, Square, J&J, Rolls-Royce, Pinterest
BairesDev ranks among the world’s largest technology outsourcing partners, offering access to 4,000+ senior software engineers across five global delivery hubs. Since 2009, the company has delivered 1,200+ projects for 500+ clients, including Google, Adobe, Square, J&J, Pinterest, and Rolls-Royce, covering more than 100 industries and tech stacks.
With teams fluent in English, aligned to US time zones, and experienced in 100+ programming languages, BairesDev supports organizations through staff augmentation, dedicated software teams, and full end-to-end software outsourcing.
Its financial software development expertise spans mobile and online banking, trading and investment platforms, payment processing, compliance automation, risk management systems, blockchain solutions, and AI-driven analytics. All solutions prioritize scalability, robust security practices, and compliance with financial regulations while helping institutions modernize legacy systems and accelerate digital transformation.
15. Empat
Proof points
- 10+ years in software development (founded 2013)
- 300+ digital products delivered
- Clients across 17+ countries
- 10M+ downloads for flagship app Obimy
- 200k+ users and 100k+ spots in ShredSpots community
Empat is a full-cycle product development partner that combines research, empathy, and strong engineering to ship products that actually work in the real world. Since 2013, the team has delivered 300+ digital products across 17 countries, from mobile and web apps to SaaS platforms, marketplaces, CRM/ERP systems, and data-driven dashboards for brands like Porsche, Panasonic, Transparency International, Heinemann, CBRE, and a wide range of high-growth startups and scaleups.
Empat’s fintech practice focuses on building modern, product-led financial solutions: digital wallets, lending and embedded finance platforms, payment flows, and personal finance tools with KYC/AML workflows built in from the start. The team has delivered white-label payout engines for marketplaces (PayFlow Engine), embedded finance SDKs for B2B SaaS (Shadowbanking), and specialized fintech products like FuelFinance and Trigga that blend robust financial logic with consumer-grade UX.
Empat helps fintechs and non-fintech brands alike turn financial features into reliable, scalable products without drowning users in complexity.
To wrap up
Core banking modernization has become a strategic condition for financial institutions to survive in the digital age. Banks operating on outdated cores face slow releases, high operational costs, limited integration, and growing security risks. The transition to modern architectures, modular, API-first, cloud-ready, opens the door to quickly launching new products, scaling the business without overpayments, automating compliance, and significantly strengthening cyber protection.
That is why the selection of the 15 best software development firms for core banking modernization focuses on teams that can rebuild the core without disrupting the business, migrate data without losing integrity, create flexible processes, and build systems ready for future regulatory requirements. Together, they form the technological foundation on which banks can grow, compete, and confidently move forward in an environment where the speed of change exceeds the capabilities of legacy systems.
