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Aleksei DyrnaevAD
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Aleksei Dyrnaev

@alekseidyrnaev

Senior Full Stack Engineer & hands-on team lead | React, Java, Node.js, Python, GCP | Complex systems, mentoring & AI-assisted delivery

Poland
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I’m a Senior Full Stack Engineer with experience leading teams of up to five people. I combine hands-on development with technical ownership, mentoring and a focus on delivering software that solves real business problems.

My core stack is React/TypeScript and Java/Spring, with backend experience in Node.js and Python. I’ve worked on backend migrations, microservices, large-dataset processing and services running on Google Cloud, including GCS and Kubernetes.

I’m particularly effective at making sense of unfamiliar codebases: tracing behavior across services, understanding complex domain rules and improving existing systems while preserving the behavior people depend on. My experience spans payments, regulated online gambling, banking, travel booking and access management.

As a team lead, I stay close to the code while helping others move forward through code reviews, pair programming, troubleshooting and clearer engineering practices. My application security background also informs how I review code and assess technical decisions.

I use AI as part of my engineering workflow and build reusable Claude Code skills and agentic workflows adopted by teammates. I bring the context and judgment needed to direct that work: understanding requirements, challenging assumptions, validating generated code and taking responsibility for the result.

Experience

Work history, roles, and key accomplishments

LG
Current

Full Stack Engineer

LeoVegas Group

Nov 2024 - Present (1 year 11 months)

Supported a time-critical Brazil payments rollout across React and backend services, translating payment-provider rules and compliance requirements into product behavior. Owned frontend architecture across two React payment services and created reusable agentic Claude skills and workflows.

ES

Senior Software Engineer

Mar 2023 - Oct 2024 (1 year 7 months)

Modernized a legacy banking application with modern web technologies while preserving business behavior. Delivered features and fixed defects across a large codebase.

ES

Development Team Lead

Mar 2022 - Feb 2023 (11 months)

Developed the React frontend of a travel booking platform, learning flight, hotel and car reservation workflows. Migrated legacy class components to React Hooks and contributed to code reviews and design discussions.

SI

Full-stack Developer

SRI Infotech

Feb 2020 - Feb 2022 (2 years)

Owned a React/Java access-role management application from feature development through deployment and production support. Introduced unit tests and refactored legacy code to make changes safer.

AS

Web Developer

Aleksandra Jozefow Sculpture studio

Sep 2020 - Apr 2021 (7 months)

Designed and built the sculpture studio website from scratch, working closely with the client and designer. Developed the mobile version for a consistent experience across devices.

SI

Senior Full Stack Developer / Team Lead

SRI Infotech

Sep 2018 - Jan 2020 (1 year 4 months)

Led a distributed team, mentoring junior developers and contributing to hiring and onboarding. Refactored a legacy React/Java application and built a cloud-migration proof of concept using Kafka, Docker, Python and Kibana.

SRI Infotech logoSI

Senior Full Stack Developer / Team leader

Sep 2018 - Jan 2020 (1 year 4 months)

Led a distributed team, mentoring developers and supporting hiring and onboarding.
Wrote Python scripts to extract and process large datasets; refactored a legacy React/Java application and improved coding practices.
Built a cloud-migration proof of concept using Kafka, Docker, Python and Kibana; identified and removed a major database performance bottleneck.

NA

Senior Full Stack Developer

NATEK

May 2017 - Aug 2018 (1 year 3 months)

Helped design and implement the frontend migration from vanilla JavaScript to React with a group of senior engineers. Identified maintainability issues in the Java backend and implemented structural refactoring.

Tieto logoTI

Full Stack Developer

Sep 2016 - Mar 2017 (6 months)

Designed and implemented the backend security layer with Spring Security. Built a responsive frontend with complex draggable interactions using vanilla JavaScript and tested behavior across browsers and devices.

Luxoft logoLU

Security Analyst

Oct 2015 - Aug 2016 (10 months)

Analyzed enterprise Java and JavaScript applications for software security issues. Designed and implemented an internal tool to automate part of the security-review workflow.

IN

Project Manager, Analyst, Developer

Jan 2015 - Aug 2015 (7 months)

Established a small team's development process, covering requirements, planning, risk and configuration management. Migrated an automated testing system from Oracle APEX to an OSGi-based platform.

Informatica logoIN

Project Manager, Analyst, Full Stack Developer

Jan 2015 - Aug 2015 (7 months)

Established a small teams development process, covering requirements, planning, risk and configuration management, and delivery tracking.
Migrated an automated testing system from Oracle APEX to an OSGi-based platform to meet client requirements.
Combined hands-on development, analysis and project coordination to connect implementation with delivery needs.

SI

Java Developer

SRI Infotech

Feb 2013 - Jan 2015 (1 year 11 months)

Developed and tested server-side functionality for a banking application using Java and Oracle. Delivered functionality against tight project deadlines and worked independently within a distributed team.

FR

Java / Perl Developer

Freelance

Oct 2013 - May 2014 (7 months)

Re-engineered a Perl application with complex medical logic in Java, preserving business behavior and improving maintainability.

SI

JavaScript Developer

SRI Infotech

Oct 2012 - Feb 2013 (4 months)

Quickly learned JavaScript and Ext JS while exploring the application's Java backend and database components.

IU

Engineer-Programmer (Computer Vision)

ITMO University

Jan 2011 - Sep 2012 (1 year 8 months)

Developed red blood cell counting and white blood cell classification software used in areas with limited access to medical specialists. Published four scientific papers and obtained a patent for automated red blood cell counting.

NA

Engineer-programmer (r&d in computer vision)

National research university of information technologies, mechanics an

Jan 2011 - Sep 2012 (1 year 8 months)

Developed red blood cell counting and white blood cell classification software used in areas with limited access to medical specialists.
Published four scientific papers and obtained a patent for automated red blood cell counting.
Defended the research-based diploma with honors.

KO

Web Developer

Kortec

Nov 2010 - Apr 2011 (5 months)

Took the initiative to learn web development while working in computer support. Developed web layouts using HTML and CSS.

KO

C# Developer (Computer Vision)

Kometa

Sep 2008 - Sep 2010 (2 years)

Researched texture recognition, validated concepts in MATLAB and implemented the solution in C#. Built an interactive desktop application to demonstrate the algorithms.

RK

Computer vision R&D

Research institute “Kometa”

Sep 2008 - Sep 2010 (2 years)

Researched texture recognition, validated concepts in MATLAB and implemented the solution in C#.
Built an interactive desktop application to demonstrate the algorithms.

Education

Degrees, certifications, and relevant coursework

CU

Carnegie Mellon University

Master of Science in Information Technology, Software Engineering

2014 - 2015

Studied software engineering disciplines:
- Management
- Software design
- Software systems modeling
- UX
- Software architecture
- Quality management
- Social network analysis
- Data mining

CU

Carnegie Mellon University

Master, Software Engineering

Grade: GPA: 3.61

Completed a Master's in Software Engineering through the CMU MSIT-SE remote program.

IU

ITMO University

Master, Image Processing and Computer Vision

Completed a Master's degree in Image Processing and Computer Vision at ITMO University in St. Petersburg, Russia.

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