Roman is available for hire
Hire RomanRoman Useinov
Verified Expert in Engineering
Back-end/Blockchain Developer
Rotterdam, Netherlands
Toptal member since August 11, 2014
Bio
Roman is a polyglot programmer heavily involved with all things related to infrastructure, data crunching, and blockchain. He thrives on projects involving tough challenges and likes to choose the tools from his large inventory that are best suited to any given task. Lately, Roman's primary focus has been on blockchain, Rust, Go, ETL, and Scala.
Portfolio
Richmond Global LLC
Rust, Formal Verification, Code Review, Coq, TLA+, Isabelle...
BFM Company Limited
Rust, Back-end, Bitcoin, Amazon Web Services (AWS), Node.js, GoLand, C
Otim
Rust, Ethereum, PostgreSQL, Amazon Web Services (AWS), JSON Web Tokens (JWT)...
Experience
- Go - 10 years
- JavaScript - 8 years
- NoSQL - 5 years
- Functional Programming - 5 years
- Rust - 5 years
- MongoDB - 5 years
- Scala - 4 years
- Concurrent Programming - 4 years
Work Experience
Senior Rust Engineer | Safety-critical Technology
2026 - 2026
Richmond Global LLC
- Reviewed the codebase to make sure it's ready for audit.
- Implemented necessary fixes to the logic and interfaces.
- Came up with a roadmap for future improvements in terms of interface and maintainability.
Technologies: Rust, Formal Verification, Code Review, Coq, TLA+, Isabelle, Software Architecture
Back-end Rust | Go | C Developer
2025 - 2026
BFM Company Limited
- Designed and developed an LLM-friendly Rust-based framework for secure back-end implementation.
- Provided oversight and peer reviews for back-end and front-end (iOS) features.
- Implemented CI/CD, monitoring, and extensive unit, integration, and UI test coverage.
Technologies: Rust, Back-end, Bitcoin, Amazon Web Services (AWS), Node.js, GoLand, C
Senior Rust Engineer
2025 - 2026
Otim
- Ensured that the Rust API interfaced with the Otim app and various SDKs.
- Contributed to Rust background services scheduling actions on-chain and indexing the results.
- Handled interfacing with on-chain contracts and various wrappers for Rust services.
Technologies: Rust, Ethereum, PostgreSQL, Amazon Web Services (AWS), JSON Web Tokens (JWT), OAuth 2, REST APIs
Rust Developer
2024 - 2024
Dekeo Inc
- Converted performance-critical image processing algorithms to Rust.
- Exposed Rust functions as Python extensions to speed up the application.
- Performed research and development to determine the libraries compatible with those available on the Python side to prevent discrepancies in resulting images.
Technologies: Rust, Python, OpenCV, APIs, C++, REST APIs
Senior Protocol Engineer (Rust/Go)
2023 - 2024
ChainSafe Systems
- Reverse-engineered the reference Go implementation to spec and implemented it in Rust.
- Designed and developed new features and maintained existing ones.
- Participated in design discussions, code reviews, and general vision.
- Contributed to infrastructure support and development: CI/CD and release process.
Technologies: Rust, Go, Terraform, REST APIs
Core Developer
2022 - 2023
Parity Technologies
- Contributed to staking system features and improvements, migrations, and testing.
- Involved in the common good parachain design, development, and release lifecycle.
- Benchmarked work on a variety of modules, including weight generation adjustment.
- Contributed to core Frame libraries, bug fixes, and macros enhancements.
Technologies: Rust, Blockchain, Cryptocurrency
Senior Rust Engineer
2021 - 2022
NOIA NETWORK aka Syntropy
- Performed research and development using a Substrate-based blockchain node.
- Set up continuous integration using GitLab and Rust caching.
- Designed a deployment solution for a network of blockchain nodes.
- Made changes to parity telemetry in order to collect statistics.
Technologies: Rust, Substrate, Blockchain, PostgreSQL, REST APIs
Go Back-end Engineer / Scala Data Engineer
2018 - 2022
Mix.com
- Maintained, designed, and implemented various ETL jobs that fuel the platform with data for both runtime and analytics.
- Implemented various back-end services and CLI tools for data monitoring, including CI/CD pipeline setup.
- Managed the infrastructure for various services, mainly via AWS CloudFormation.
Technologies: Amazon Web Services (AWS), Python, Spark, Go, Scala, Databricks, Apache Spark, Machine Learning, Identity & Access Management (IAM), JSON Web Tokens (JWT), REST APIs
Rust Developer
2020 - 2020
Liftbridge
- Performed a protocol investigation to come up with good abstractions.
- Created the integration testing set up to make sure that the driver works.
- Designed the Rust driver and oversaw development and testing (protobuf codegen).
Technologies: Rust, Architecture
Go Blockchain Developer and Architect
2018 - 2019
IOV
- Involved in core weave framework development and architecture.
- Added Kubernetes infrastructure setup for test networks, monitoring, and production.
- Pioneered Google Cloud setup via Terraform, automation, and testing.
Technologies: Go, Tendermint, Kubernetes, PostgreSQL
Data Engineer
2017 - 2018
Takt
- Designed and architected distributed data analysis jobs.
- Integrated jobs with the rest of the infrastructure.
- Set up continuous integration.
- Set up a testing framework specific to the project.
- Designed and maintained Airflow jobs.
Technologies: Apache Airflow, EMR, Python, Spark, Scala, Apache Spark
Go Software Engineer
2016 - 2017
FuboTV
- Designed and implemented various Go back-end services.
- Conducted peer reviews while enforcing best coding practices in Go.
- Developed infrastructure: Go-based queue libraries and API services.
- CI/CD setup: making sure the code is properly verified before being built and deployed.
Technologies: Go, Varnish, MySQL, Kubernetes, Redis, REST APIs
Software Engineer
2016 - 2016
Augmate
- Built a JWT authentication system and refactored out third-party authentication system Stormpath.
- Built a message bus service and refactored out a PubNub messaging platform.
- Created a metric receiver API and refactored out usage of AWS Kinesis service.
- Took care of Docker setup for new services.
- Provided peer reviews and testing.
Technologies: Amazon Web Services (AWS), Dropwizard, MySQL, Java, JSON Web Tokens (JWT), REST APIs
Go Software Engineer
2016 - 2016
Airbrake.io
- Designed and implemented improvements to a high-load activity feed, including data migrations. All of the back-end services were written in Go.
- Conducted peer code reviews on a Go and SQL codebase.
- Participated in feature discussions and development.
- Set up Ansible roles for software deployment, reusable infra-as-code.
- Designed and implemented various console applications in Go.
Technologies: PostgreSQL, Go, REST APIs
Go Software Developer
2015 - 2016
Bauxy
- Implemented and designed a single-page app REST API.
- Designed and developed a client REST API in Go, exposed via Swagger.
- Designed several common Go libraries for future use.
- Implemented Go console task processors with proper monitoring and graceful signal handling.
- Conducted peer review and ideation, enforcing Go best practices.
- Worked on a customized deployment system similar to Heroku and Cloud Foundry.
Technologies: Amazon Web Services (AWS), Cloud Foundry, Redis, Docker, PostgreSQL, Go, REST APIs
Software Engineer
2015 - 2015
5AM (Oncology Research Software)
- Designed and implemented an environment setup for development and production.
- Implemented various REST APIs using Spring Boot.
- Implemented a set of integration/unit tests.
- Implemented interfacing with external services, using RestTemplate and Spring-Retry.
- Conducted peer reviews.
Technologies: Vagrant, Node.js, Gradle, Spring, Java
Software Engineer
2014 - 2015
Winnin.com
- Designed and implemented a high-throughput voting API solution.
- Leveraged AWS Kinesis for event processing.
- Handled large dataset storage using DynamoDB.
- Implemented record expiration for rating using MongoDB TTL Indexes.
- Implemented an event consumer and processor using Scala.
Technologies: MongoDB, Amazon DynamoDB, Amazon Kinesis, Play Framework, Java, Scala
Software Developer
2013 - 2015
Booking.com
- Developed an experimentation API.
- Created various libraries and experiments to improve conversion.
- Developed tools for infrastructure and statistics.
- Used Hadoop to store, retrieve, and analyze request event data, user actions, and search bot actions.
- Implemented a crawler emulating Google behavior and making use of headless browsers to render JavaScript.
Technologies: Java, JavaScript, Hadoop, Perl
Back-end Engineer
2013 - 2014
Construction Management
- Designed and developed PostgreSQL logic to deal with transactions atomically.
- Implemented an Elasticsearch-based solution to store materialized views based on PostgreSQL data for quick and easy reads, reducing back-end logic and database load.
- Implemented a Node.js API server that would call PostgreSQL stored procedures, create/update/delete relevant records from an Elasticsearch index, and serve various data stored in Elasticsearch.
Technologies: Node.js, PostgreSQL, Elasticsearch
Software Developer
2013 - 2014
Aidata
- Created a multithreaded Java-based crawler.
- Implemented reporting and live updates.
- Created a REST API for live video feeds.
- Scaled the system to a cluster.
- Used multiple Tor connections to avoid problems with scraping.
Technologies: PostgreSQL, Java
Software Developer
2013 - 2014
Vifeed
- Implemented a real-time video tracking module.
- Implemented real-time statistics.
- Integrated with the YouTube platform.
- Created a widget to integrate embedded code to various websites.
- Managed a small group of developers working on miscellaneous modules for the application.
Technologies: MySQL, Redis, Node.js
Software Developer
2012 - 2013
DIO Software
- Implemented integration with various services and applications to grant automatic access for users.
- Implemented a multithreaded asynchronous environment for executing workflow tasks and populating caches.
- Created UI solutions using JSF and RichFaces.
- Designed web services for integration with separate modules, such as reporting.
- Implemented a rule engine using Drools.
Technologies: RichFaces, JSF, jBPM, Ehcache, Sybase, JPA, Hibernate, Spring, Seam, Java
Software Developer
2012 - 2013
Clevertech
- Designed and architected a construction management app.
- Designed and integrated cached layers to complex SQL data structures using Node.js and ElasticSearch.
- Designed and implemented several accounting apps.
- Provided support for several projects.
- Contributed to various web-based tools and libraries.
Technologies: Node.js, PHP
Team Lead
2010 - 2011
Obnovlenie
- Created Regex parsers and integrated with travel operators using PHP socket programming.
- Developed a content management system.
- Maintained and wrote modules for Redmine.
- Integrated with a Perl-based corporate CRM.
- Developed a Java console application aggregator for travel operator data.
- Reviewed code and managed tasks as the team leader.
- Integrated Varnish with Redis using C libraries.
Technologies: C, Perl, Ruby, MySQL, APC, Memcached, Varnish, Redis, PHP, Socket Programming, Java
Software Developer
2008 - 2010
Ailove.ru
- Developed the server side for multiplayer online games.
- Fixed bugs and maintained a number of websites.
- Gathered end user marketing data through an entertainment website using SOAP as a transport.
- Contributed to the company-built web framework.
- Participated in server tuning.
Technologies: Java, Memcached, PostgreSQL, MySQL, PHP, SOAP, Linux
Software Developer
2008 - 2009
SmartLab
- Implemented billing and accounting systems.
- Created an AJAX-based interactive ticket and feedback management system.
- Developed scripts for deployment and backup.
- Configured application servers.
- Set up smart caching systems to increase capacity.
Technologies: Bash Script, PHP, MacOS, Linux
Software Developer
2007 - 2008
Legion Business Systems
- Designed and developed PHP and .NET engines for the corporate website.
- Maintained a MySQL database.
- Migrated data schema from an old project to a new one.
- Changed persistent storage from MySQL to MS SQL.
- Developed GUI content management tools using .NET.
Technologies: .NET, MySQL, PHP, Microsoft SQL Server, C#
Project History
Airbrake
http://airbrake.ioAn error collection and aggregation platform that allows for better error visibility and tracking. I've been involved in the design and development of the platform's back-end components and data migration.
FuboTV
https://www.fubo.tv/Fubo (formerly FuboTV) is a live TV streaming service designed as a complete cable replacement, marketing itself with a sports-first mentality. It streams live television over the internet—meaning no contracts, cables, or bulky boxes are required.
Physics Simulation Framework
https://moonshot.space/A framework and an application, written in Rust that allows running physics simulations and visualizations. Custom synchronization primitives are optimized for performance, CUDA kernels for faster calculations, and Bevy for visualization.
Booking.com
https://www.booking.com/One of the largest eCommerce websites in the world.
I worked on improving SEO by introducing an experiment framework and an internal distributed crawler to analyse potential problems with the website.
I worked on improving SEO by introducing an experiment framework and an internal distributed crawler to analyse potential problems with the website.
Education
2005 - 2010
Master's Degree in Computer Engineering
National Research University of Information Technologies, Mechanics, and Optics - Saint-Petersburg, Russia
Skills
Libraries/APIs
Node.js, jQuery, REST APIs, Google API, Facebook API, RichFaces, OpenCV
Tools
Eclipse IDE, IntelliJ IDEA, Zoom, Varnish, Sublime Text, Gradle, Vagrant, Apache Airflow, Terraform, GoLand
Languages
Rust, Go, JavaScript, Java, PHP, Groovy, Perl, SQL, Scala, Erlang, C#, Bash Script, Ruby, Python, C, C++, Coq, TLA+
Frameworks
Play Framework, Yii, gRPC, JSON Web Tokens (JWT), Spark, AngularJS, Apache Spark, Spring, Hadoop, Android SDK, OAuth 2, Spring Boot, .NET, Seam, Hibernate, JPA, jBPM, JSF, Dropwizard, Tendermint, Substrate
Paradigms
Microservices, Agile Software Development, Microservices Architecture, Concurrent Programming, Functional Programming, Socket Programming
Storage
Redis, Cassandra, PostgreSQL, MongoDB, NoSQL, HBase, MySQL, Elasticsearch, Microsoft SQL Server, Memcached, Sybase, Amazon DynamoDB, HDFS
Platforms
MacOS, Heroku, Kubernetes, Windows, Android, Linux, Google Cloud Platform (GCP), Databricks, Apache Kafka, OS X, Docker, Amazon Web Services (AWS), Blockchain, NVIDIA CUDA, Ethereum
Other
Data Engineering, WebSockets, Performance Improvement, Scalability, Data Mining, SDKs, Telemetry, Software Development, Debugging, Distributed Systems, Cloud Foundry, Technical Leadership, Identity & Access Management (IAM), Search, Memory Leaks, System Architecture, Webex, SOAP, APC, Ehcache, Amazon Kinesis, EMR, Cryptocurrency, Architecture, APIs, Data, Performance, Optimization, Machine Learning, FastAPI, Formal Verification, Code Review, Isabelle, Software Architecture, Back-end, Bitcoin
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