Tuomas Hietanen
Chief Technology Officer at Finular
London, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolTuomas Hietanen is a pragmatic CTO with 15 years of experience building resilient, cloud-first financial platforms and leading large engineering teams. He built a production F#/Azure fintech platform that served tens of thousands of users with 99.99% uptime and strong regulatory controls, combining functional programming, blockchain, ML and real‑time websockets. Previously he led backend architecture at Basware for enterprise-scale systems, advocating functional approaches, build tooling (Fake/Paket) and reactive patterns across teams of 100+. An active open-source contributor, Tuomas has improved core .NET/F# projects—Paket, FSharp.Data and the F# compiler—focusing on performance, concurrency fixes and dependency tooling that benefit the wider ecosystem. He pairs deep hands-on compiler/library-level skills with product-grade operational discipline and a track record of shipping secure, maintainable systems.
15 years of coding experience
17 years of employment as a software developer
Business Administration Finance Accounting and Office Services, Business Administration Finance Accounting and Office Services at Finnish Institute for Enterprise ManagementM.Sc (DI) Information Processing Artificial Intelligence Software Engineering Telecommunications, M.Sc (DI) Information Processing Artificial Intelligence Software Engineering Telecommunications at LUT University
Github Skills (40)
nuget10
linq10
net10
dotnet10
microsoft-azure10
type-providers10
asp-net10
compiler-compiler10
expression-trees10
arm-templates10
dotnet-core10
compiler10
fsharp10
azure10
functional-programming10
Programming languages (14)
Github contributions (5)
scottksmith95/LINQKit
Mar 2014 - Jan 2022
LINQKit is a free set of extensions for LINQ to SQL and Entity Framework power users.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:40 commits, 9 PRs, 22 pushes in 7 years 11 months
Contributions summary:Tuomas primarily focused on maintaining and improving the LinqKit library, which is designed to extend LINQ capabilities. Their contributions included upgrading the .NET framework version, code cleanup based on Resharper and FxCop, and integrating expression support from an external branch. The user also addressed a specific issue related to aggregate functions and added unit tests to verify the functionality of the library.
dotnetentitysqlefcorec-sharp
dotnet/fsharp
Jan 2015 - Mar 2025
The F# compiler, F# core library, F# language service, and F# tooling integration for Visual Studio
Role in this project:Back-end Developer
Back-end DeveloperContributions:28 reviews, 10 PRs, 118 comments in 10 years 4 months
Contributions summary:Tuomas's commits primarily involve code cleanup, performance optimizations, and bug fixes within the F# compiler and core library. They addressed concurrent dictionary issues, optimized code through refactoring, and improved performance by minimizing redundant operations. The user also contributed to type provider enhancements and refactored regex construction, demonstrating a focus on code quality and efficiency.
dotnetfunctional-programmingfsharplanguage-servicecore-library
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