Aleksei is available for hire
Hire AlekseiAleksei Matiushkin
Verified Expert in Engineering
Software Engineer and Developer
Barcelona, Spain
Toptal member since February 19, 2026
Bio
Aleksei is a senior developer with over 20 years of experience building robust software on more than 10 different languages, including, but not limited to, Java, Haskell, Erlang, Elixir, and Ruby. He specializes in back-end, high-load, fault-tolerant systems, with proven expertise across fintech and telecom, and a functional rather than object-oriented approach.
Portfolio
Oeditus
Applied Mathematics, Elixir, Erlang (OTP), Flutter, Phoenix LiveView...
Kantox
Ruby, Erlang (OTP), Elixir, Elixir Broadway, Erlang, RabbitMQ, Linux, MySQL...
Self-employed
Ruby, Elixir, Erlang (OTP), Idris
Experience
- Architecture - 15 years
- Technical Leadership - 15 years
- Ruby on Rails (RoR) - 15 years
- Erlang (OTP) - 13 years
- Elixir - 10 years
- Fintech - 10 years
- Phoenix LiveView - 6 years
- Social Networks - 3 years
Preferred Environment
Linux, Vim Text Editor, Warp Terminal
The most amazing...
...solution I've built is a machinery for smart currency exchange, serving and automatically placing contracts for worldwide clients for 10 years already.
Work Experience
Principal Engineer
2024 - PRESENT
Oeditus
- Built a social app, Amotion.city, to connect travelers via photo and experience sharing in real time.
- Architected and developed the MVP for software audit SaaS.
- Created MetaAST library, allowing the unification of the source code across programming languages (Hexdocs.pm/metastatic).
Technologies: Applied Mathematics, Elixir, Erlang (OTP), Flutter, Phoenix LiveView, Social Networks, Amazon Web Services (AWS), GPS, Retrieval-augmented Generation (RAG), Technical Leadership, Architecture
Principal Engineer
2015 - 2024
Kantox
- Authored and architected several high-load solutions in both Elixir and Ruby from scratch.
- Contributed to the main Kantox SaaS project (RoR) and all the Kantox OSS efforts (Ruby and Elixir).
- Created several client-facing solutions, providing real-time functionality, like webhooks and email-sending on any changes related to clients’ accounts for effortless automation, based on FSM transitions.
- Improved the client data uploads by introducing the new stream parsing for large CSV files, with in-place validation and import. This effort resulted in OSS `see_as_vee` library.
- Created and published several OSS Ruby and Elixir libraries.
- Authored and architected more than five BEAM microservices.
- Provided many commits to the Elixir compiler, Elixir core libraries, and Elixir and Ruby libraries we used.
Technologies: Ruby, Erlang (OTP), Elixir, Elixir Broadway, Erlang, RabbitMQ, Linux, MySQL, PostgreSQL, Ruby on Rails (RoR), Amazon Web Services (AWS), Technical Leadership, Fintech, Architecture
Software Engineer
2009 - 2015
Self-employed
- Developed many turnkey applications, audited several projects in 5+ different languages.
- Built several OSS tools to accomplish the tasks appearing during the freelance journey.
- Proposed several ideas that saved development time and resulted in the KPI growth of the clients.
Technologies: Ruby, Elixir, Erlang (OTP), Idris
Project Lead
2005 - 2008
Yandex
- Directed the development of the Jabber server/client machinery.
- Improved the P2P client interoperability, like file sharing and natural language processing, using integrations with other Yandex services.
- Provided several patches to the Linux supplementary software, such as screensaver management and GNOME and KDE taskbar enhancements.
- Brought the syntax highlighting and code snippets to our solution as we were targeting tech geeks.
Technologies: Erlang, C++, Ruby
GUI Team Lead
2000 - 2003
The Rationalizer AG, Berlin
- Architected and led development of the GUI tool to create M² models based on the MOF M³ model.
- Led the building of a custom IDE based on NetBeans (Forte).
- Introduced an Aspect-oriented development, which allowed the team to build ad-hoc components for the custom models.
Technologies: Java, Haskell
Experience
Finite Automata Library for Elixir
https://github.com/am-kantox/finitomataI directed an OSS implementation of Finite Automata in pure Elixir.
This library leverages callbacks not only to fully implement the FSM, but also to provide a compile-time proof that the FSM is valid and functional. One of the most important things this library provides is the FSM description itself: fault-tolerant, not error-prone, and easy to grasp. The FSM definition, which is currently supported in both PlantUML and Mermaid, would be drawn in the project's generated docs using this library.
This library leverages callbacks not only to fully implement the FSM, but also to provide a compile-time proof that the FSM is valid and functional. One of the most important things this library provides is the FSM description itself: fault-tolerant, not error-prone, and easy to grasp. The FSM definition, which is currently supported in both PlantUML and Mermaid, would be drawn in the project's generated docs using this library.
Closed Social Network for Discovering and Connecting with Local Community
https://amotion.cityAmotion City is a social network that connects people through photos with geolocation that they take and share. The network is currently available in Spain, Austria, Switzerland, and partially in Germany.
The interim gameplay is gained through photo sharing, likes, comments, and organizing meetings.
The interim gameplay is gained through photo sharing, likes, comments, and organizing meetings.
Oeditus
https://oeditus.comAn Elixir (Phoenix) based static analyzer with AI features, allowing the codebase audits based on both static detection of points of failures (CWE Top-25, N+1 Queries, Sync-over-Async, etc) and an AI code analysis.
Education
1990 - 1996
Master's Degree in Informatics and Applied Mathematics
Saint Petersburg State University - Saint Petersburg, Russia
Skills
Libraries/APIs
Elixir Broadway
Tools
Vim Text Editor, RabbitMQ
Languages
Ruby, Erlang (OTP), Elixir, Erlang, C++, Java, Haskell, Idris
Frameworks
Phoenix, Ruby on Rails (RoR), Flutter
Platforms
Linux, Amazon Web Services (AWS)
Storage
MySQL, PostgreSQL
Other
Phoenix LiveView, Architecture, Technical Leadership, Project Design, Software Architecture, Software Design, Applied Mathematics, Computational Science, Social Networks, GPS, Fintech, Retrieval-augmented Generation (RAG), Warp Terminal
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