6 Best programming languages for FinTech

Check out our comprehensive comparison of six programming languages for the FinTech and finance industries (plus case studies).


According to HackerRank, the six best programming languages for FinTech and finance are Python, Java, C++, C#, C, and Ruby.

But don’t think that Python is the best solution just because it’s number one on the list. Each project requires a detailed consideration of all the technical and business requirements and your specific needs. What’s most important is to take into account the benefits and drawbacks of each language and check out successful use cases.

1. Python

Python is a general-purpose technology created by a developer from the Netherlands.  Guido van Rossum, the creator of Python, wanted his language to be very simple. The main peculiarity of Python is that its syntax is minimalistic.

Python is a leading programming language in the FinTech sphere and is also widespread in the banking, insurance, and data analysis industries. Python is also becoming popular as a tool to build cryptocurrency markets. What’s more, some claim that Python is the best technology for machine learning.

The main advantages of Python that make it so popular in the FinTech industry are:

  • Scalability. Python isn’t a complicated language and it’s very consistent. This makes the technology scalable. One of the best proofs is YouTube, with more than a billion unique users per month and about one hundred hours of video uploaded per minute! And all this works using Python as the main technology.
  • Concise code. Python’s syntax is laconic, so developers need to write fewer lines of code than if they used another technology. Even more, it’s simple. That’s why a lot of young developers start their careers with Python.
  • Pythonic standards. The Python community has developed some standards for code that helps developers to read, maintain, and modify someone else’s code easily.
  • Powerful framework. The most famous and commonly used Python framework is Django. Django has much more off-the-shelf functionality than frameworks in other languages.

Despite all these benefits, there’s a fly in the ointment. Here are the drawbacks of Python.

  • No web browser support. Python doesn’t support web browser, yet there are plugins that provide direct access to the DOM model of the web browser.
  • Design restrictions. The so-called Global Interpreter Lock, or GIL, keeps the Python virtual machine single-threaded, which limits the language’s asynchronous capabilities.

Python case studies

Vyze is a US FinTech startup that provides financing services and connects retailers and lenders. These lenders provide numerous retail consumer financing products via the Vyze platform that works across point of sale devices, tablets, self-service kiosks, e-commerce solutions, and web portals.

Bought by Many is a service for people with uncommon insurance requirements who can’t get standard insurance to meet their unique needs (for instance, to insure a crocodile). People gather into different interest groups on the platform to get better offers from insurance companies.

2. Java

Java is a programming language that promotes OOP principles and was designed by the Canadian James Arthur Gosling who worked for Sun Microsystems. The language was officially launched in 1995 and soon after was sold to Oracle.

Java is a favorite programming technology for banks as it offers security and is great for building heavily loaded programs that can deal with a huge amount of data.

Java is language number one for big data projects and is quite popular in the financial and FinTech industries. Here’s why:

  • Security. This is a core characteristic that James Gosling wanted his language to have. Java has several built-in features which make it secure, such as enforcing runtime constraints and a powerful security manager.
  • Portability. Java is highly supported. The language runs on a virtual machine that’s supported by many operating systems.

Nevertheless, there are several disadvantages of Java that you need to know about:

  • Lower speed. Java is slow. Although Java has become much faster than it was in the past, it’s still slower than other languages.
  • Lower performance. Java is a memory-consuming technology. This makes the language less productive.

Java case studies

Goldman Sachs is a US multinational investment bank that trades securities and offers investment and asset management services. The bank has used Java as the core technology for their e-trading system.

Barclays is a British financial conglomerate that offers all possible banking services from personal banking and mobile banking to investments. Barclays mainly uses Java and C++ in their projects.

3. C++

C++ is a general-purpose technology that was designed in the 1980s. Bjarne Stroustrup, the creator, took the C language and made adjustments needed for his project. Stroustrup was working with the Simula programming language at the time and created C++ by copying Simula capabilities that he needed into the C language.

In the FinTech industry, C++ is used for programs where execution speed plays the most important role, as C++ is well known for its efficiency. This technology is commonly applied to programs that require advanced computations and have to process numerous operations quickly. Additionally, C++ is considered one of the best technologies for quantitative finance and quantitative analytics.

C++ is famous for:

  • Efficiency. The language is fast — very fast. This is thanks to tight data structures and template metaprogramming. C++ is considered one of the fastest programming technologies nowadays.
  • Code reusability. C++ promotes code reusability. This gets very useful when building complex projects.
  • Rich library. The Standard Template Library offers a wide range of versatile tools for any needs.

There are also some language limitations you need to bear in mind when considering C++ for your FinTech project.

  • Complexity. The technology is rather old, which makes it massive and complex. This complexity influences code readability and maintainability.
  • Insecurity. It’s difficult to write secure code in C++. There are a lot of pitfalls and tricks that you need to think through to make your software system based on C++ reliable. For instance, you shouldn’t use pointers.

C++ case studies

Bloomberg is an open source platform aimed at providing financial news and data 24/7. This data concerns real-time price information, financial information, trading news, and analytics. The project is created with the help of C++ and C technologies.

QuantLib is a free and open source framework written in C++ for quantitative finance. It provides developers with modeling, trading, and real-life risk management capabilities.

4. C#

Microsoft designed C# for its internal needs in 2001. The language has C-like syntax. Anders Hejlsberg, the main creator, took all the best from C and Java and combined it in his new language.

C# is a simple, elegant language that’s mostly used to build .NET programs for the Microsoft operating system, 3D Unity games, websites, and even mobile apps.

Developers choose this language because of:

  • Cross-language interoperability. Working with .NET, you can create a component in one language and inherit and extend that component in C#.
  • Enhancements to C. C# took all the best from C and C++ and even some great capabilities from Java.
  • Vast number of libraries. C# can be extended with all third-party libraries for the .NET platform. All these solutions extend C# functionality and make it really an all-purpose language.
  • Type safety. C# is a type-safe programming language. It doesn’t allow developers to use any uninitialized variables. This peculiarity makes C# code safe.

The technology also has some limitations:

  • Low speed. C# is slower than C and C++.
  • Too dependant on .NET. If a developer needs to implement something that isn’t found in .NET, they’ll face a lot of difficulties.

C# case studies

Cadre is a NYC-based startup launched in 2015. The company provides customers with insights into real estate investment opportunities and real-time analytics so they can make well-considered, hassle-free decisions on where to invest.

Easyship is a company that aims at helping small and midsized e-commerce businesses sell all over the world and ship their goods worldwide with one click. Easyship allows businesses to compare prices and taxes for more than 40 shipping companies.

5. С

C was created in the 1970s by Dennis Ritchie for the UNIX operating system. C has influenced a lot of modern programming languages such as C++, C#, Objective-C, and even Java.

Developers use C for embedded systems, advanced scientific systems, databases, billing software, and bank management platforms.

The technology has a long list of benefits for developers. Here are the most significant:

  • Mid-level language. C is incredibly versatile and can be used to create a program for hardware or for a web app.
  • Highly portable. C forms the core elements of the majority of modern operating systems and can work on most of them.
  • Maturity. C is one of the richest technologies and has tons of ready-made third-party solutions, so it’s always easy to find what you’re looking for.
  • High speed. C compiles very quickly. Moreover, the C compiler optimizes C code for faster execution.

Some limits that C places on developers include:

  • Lack of reusable code. This becomes critical for large, complex systems.
  • Lack of flexibility. As a system grows, it becomes harder to fix bugs in it. Some developers complain that even a small mistake can lead to disaster.

C is widely used to program point of sale (POS) devices, POS console systems, and cash register terminals.

6. Ruby

Although Ruby isn’t a leader in the list of the best programming languages for the FinTech sphere, Ruby has all the capabilities and characteristics that are necessary for fast and successful app development and is also worth considering as the main technology for your project.

Ruby was created as a puzzle in 1995. Yukihiro Matsumoto (also known as Matz) combined the most efficient features of Lisp, Perl, Ada, Eifel, and some other technologies. Ruby is a dynamic and reflective technology that’s sophisticated and capable at the same time.

In the financial sphere, Ruby is only just starting to gain popularity. It’s used to build digital payment systems, e-wallets, asset management systems, and analytical and financial dashboards.

It’s worth mentioning that Ruby is one of the favorite choices for startups. Developers like using Ruby for their financial projects because of a range of advantages:

  • Time efficiency. An abundance of ready-made plugins and third-party libraries allows developers to create projects without even writing a line of code.
  • Powerful framework. Ruby on Rails, the main Ruby framework, is a quality tool for writing bug-fee, highly secure code and building scalable and maintainable apps.
  • Cost efficiency. The development speed, tons of free gems, and bug-free code all make development faster and cheaper.

As for Ruby’s disadvantages, there are some bottlenecks which you need to take into account:

  • Documentation. There are so many different libraries, plugins, and gems for Ruby that it’s sometimes difficult to find decent documentation for an old tool.
  • Boot speed. A huge number of external libraries and gems is definitely a benefit, yet when a large number of them are included in a project it takes a significant amount of time to start.

Ruby case studies

Coinbase is a digital currency e-wallet. The wallet lets customers link their bank accounts to the system, manage assets, and buy and sell cryptocurrencies.

Sush.io is a dashboard where users can track their bank operations, expenditures, and revenue. Users can sync their Stripe, PayPal, and Etsy account data with QuickBooks online.

BillFront is a RubyGarage project for the FinTech industry. This financial solution was launched for publishers, ad tech vendors, and ad networks. The platform allows users to access their revenues faster and not depend on long payment terms.

Wrapping up

The right technology is the foundation of any project. Your technology stack has to fit all the project criteria and meet your demands. Each language is perfect for a specific purpose, so make sure you have a clear understanding and vision of what your project is going to be like.

PS: The article was made by RubyGarage team