Your payments platform runs on a .NET Framework monolith nobody wants to touch. Auditors want PCI DSS evidence. The board wants a lending product live this year. Most vendors say “fintech” and mean one banking app from 2019. Finding .NET development companies in the US for financial services firms that have shipped regulated software, and not just talked about it, takes real filtering. I scored each firm on fintech depth, compliance posture, Azure and ASP.NET Core maturity, and how the engagement is structured.
| Company | Best for | Pricing |
| Leobit | Fintech, lending, InsurTech on .NET | Mid-range, quote-based |
| Itransition | Enterprise banking and lending software | Mid-range, quote-based |
| ScienceSoft | Compliance-heavy financial systems | Mid-range, quote-based |
| N-ix | Large-scale financial modernization programs | Premium, quote-based |
| Future Processing | Legacy .NET modernization, European delivery | Mid-range, quote-based |
| Cleveroad | Payments and fintech MVPs | Mid-range, quote-based |
| Tatvasoft | Hourly .NET capacity on a tighter budget | Accessible, hourly |
What I Looked For
I shortlisted from the .NET vendors I’ve tracked over several years and cut anyone without a visible financial-services track record. Service pages had to name real .NET work: ASP.NET Core, Azure, migration from legacy Framework. If I couldn’t tell what a firm had built for banks, lenders or insurers, I moved on.
Next came proof. Published case studies with named products or outcomes outranked logo walls. I also checked for Microsoft partner status and for ISO 27001 and PCI DSS compliance, since those decide whether a security review passes. I went through customer feedback on Clutch to see how clients rate these firms first-hand.
Engagement transparency mattered last. Firms that explained their pricing model and team structure upfront ranked above firms that hid behind “contact us” with no context. Assessment rests on public data only.
How They Compare
Clutch ratings where verified public data exists:
| Company | Clutch |
| Leobit | 5/5 (56 reviews) |
| Itransition | 4.9/5 (41 reviews) |
| ScienceSoft | – |
| N-ix | – |
| Future Processing | – |
| Cleveroad | – |
| Tatvasoft | – |
1. Leobit
Leobit is a .NET-first engineering partner with more than 100 .NET projects delivered since 2014. It is a Microsoft Solutions Partner for Digital & App Innovation, and the core stack is ASP.NET Core, Blazor, .NET MAUI, Azure and C# with MS SQL.
Financial software is the center of gravity. Leobit built a real-estate investment platform that facilitated $1.4B in purchases, plus mortgage-lending and payment-processing systems and the Breeze InsurTech product. That is nine-plus years of regulated work, backed by PCI DSS, GDPR and ISO 27001 compliance.
For fintech teams, Leobit runs senior Microsoft-certified dedicated teams out of an Austin, TX office with European delivery, which is the kind of .net development companies in us for financial services firms engagement built around long-term product ownership. Clients range from Fortune 500 to funded startups. On Clutch, Leobit holds 5/5 across 56 reviews.
Pricing sits mid-market and is quoted per engagement.
Payments, lending and InsurTech products stay in production with the same team that built them.
Best for: CTOs picking among .net development companies in us for payments, lending and InsurTech products.
2. Itransition
Itransition sells scale. The firm was founded in 1998 and has a US presence in Denver, Colorado, with a wide delivery bench behind it. Banking, lending and wealth software sit among its established verticals.
Clutch lists Itransition at 4.9/5 across 41 reviews. The pull here is breadth: .NET, Azure and data engineering under one roof, useful when a core-banking integration touches five systems.
Pricing runs mid-range and quote-based.
A large organization means more process. For a compliance-heavy enterprise, that is often the point.
Best for: established financial institutions needing broad .NET and data capacity on enterprise programs.
3. ScienceSoft
Compliance is the first thing ScienceSoft puts on the table. Founded in 1989 and headquartered in McKinney, Texas, it has decades of experience in healthcare and financial software. That longevity shows in how it documents security.
For a US lender or payments firm, a vendor already fluent in audits saves weeks. Its .NET and Azure work covers custom banking apps, integrations and analytics.
Pricing is mid-range and quote-based, scoped per project.
The review trail is thinner than some rivals’, so reference calls matter.
Best for: US financial services firms where audit readiness and security documentation drive the vendor choice.
4. N-ix
Large modernization programs are where N-ix tends to win. It is an engineering company with delivery centers across Europe and a sizeable client list in finance and fintech. Teams scale quickly when a migration spans dozens of services.
Expect Microsoft-stack depth alongside cloud and data capability. The firm is better suited to multi-quarter programs than to a three-person prototype.
Pricing sits at the premium end and runs on custom quotes.
Smaller fintech startups may find the scale more than the product needs. Large banks and insurers will not.
Best for: enterprise banks and insurers running multi-team modernization with fixed European delivery capacity.
5. Future Processing
Future Processing was founded in 1997 in Gliwice, Poland, and has long been a Microsoft-focused house. Legacy .NET Framework systems are familiar territory. Moving them to .NET Core and Azure is bread and butter.
The company has worked across banking and insurance, with a methodical approach to discovery before code. That suits teams who need a migration plan the risk committee will sign.
Pricing is mid-range and quote-based.
European delivery gives a time-zone trade-off for US teams. Overlap hours work for most, though not all.
Best for: firms modernizing aging .NET Framework platforms who value structured discovery.
6. Cleveroad
If you’re building a payments app on .NET for a fintech startup, Cleveroad is a sensible shortlist name. It builds web and mobile products for fintech clients, with a quick path from concept to working MVP.
Teams are compact. Communication is direct.
Pricing falls mid-range, quote-based per project.
Cleveroad’s focus is product delivery for startups and scale-ups. Banks with sprawling core-system integration needs may want a heavier bench.
Best for: funded fintech startups shipping a payments or wallet MVP on a tight launch window.
7. Tatvasoft
Tatvasoft is the accessible option. It was founded in 2001 and is based in Ahmedabad, India, with .NET as a long-standing core competence. Hourly engagement is the model.
That structure helps when scope is still moving and you need .NET capacity quickly. Hourly billing keeps spend visible week to week.
Pricing is entry-level and hourly.
Regulated-industry depth varies by project, so ask for fintech references and compliance evidence early.
Best for: teams adding flexible .NET capacity on an hourly basis where scope is still evolving.
What to Ask Before You Sign
Run this checklist against every shortlisted firm.
Can they show shipped fintech work? Case studies with named products beat claims. Ask Leobit about its payment-processing and lending systems, and ask Itransition about its banking delivery.
Do they hold ISO 27001, and can they handle PCI DSS? Request certificates, not assurances. ScienceSoft’s audit fluency is worth testing against your own scope.
Is the Microsoft partnership current? A Solutions Partner designation signals tested Azure and .NET competence.
Who is on the team? Senior engineers on your project, not on the pitch deck. Dedicated teams such as those at Leobit or N-ix should be named before contract.
What does legacy migration look like? Future Processing’s discovery-first approach shows what a credible plan contains.
How is pricing structured? Hourly, as at Tatvasoft, or quote-based, as at Cleveroad. Know which before the call.
Pick the partner whose compliance evidence, team seniority and engagement model survive your hardest question. Everything else is packaging.
Frequently Asked Questions
How do I choose among .net development companies in us for financial services firms?
Start with proof of shipped financial products, then check compliance evidence such as ISO 27001 and PCI DSS, and Microsoft partner status. Ask who is actually on the team. Finally, confirm the engagement model fits your roadmap, whether dedicated team, project, or hourly.
What services do .net development companies in us for financial services firms provide?
Typical scope covers custom payments, banking, lending and InsurTech applications on ASP.NET Core, plus Azure cloud work, mobile apps with .NET MAUI, and integrations with core banking systems. Many also modernize legacy .NET Framework applications to current .NET versions while keeping regulated workloads compliant.
How much does hiring a .NET development company for fintech cost?
Cost depends on scope, team seniority and engagement model. Most firms in this list quote per project, while some bill hourly. Compliance requirements such as PCI DSS add effort. Request a scoped estimate from two or three vendors rather than relying on general ranges.
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