Aliaksandr is available for hire
Hire AliaksandrAliaksandr Kalashnikau
Verified Expert in Engineering
Full-stack Developer
Warsaw, Poland
Toptal member since July 6, 2026
Bio
Alex is a senior full-stack developer with 10+ years of experience shipping production SaaS for North American clients across automotive, fintech, and business automation. His core stack includes Python (Django, FastAPI), React, Vue.js, PostgreSQL, and Docker. He was part of the founding team that built a SaaS platform from zero and is now a multi-million dollar business. Alex actively uses AI tools as a genuine productivity boost.
Portfolio
Confidential Client
Python, Django, React, Node.js, PostgreSQL, Redis, Celery, Docker...
Confidential Client
Django, React, Node.js, MySQL, Docker, Vue, PHP, Yii 2, Laravel, PostgreSQL...
Allot
Python, GitLab CI/CD, Vue, Full-stack, GitHub, Jira, Linux, WebSockets...
Experience
- Full-stack - 8 years
- Python - 7 years
- React - 6 years
- PostgreSQL - 6 years
- Node.js - 5 years
- Vue - 5 years
- Django - 5 years
- FastAPI - 3 years
Work Experience
Senior Full-stack Developer
2023 - 2026
Confidential Client
- Designed and delivered a complete LMS end-to-end in 20 days as a final project.
- Defined system architecture, wrote technical specifications, and guided key implementation decisions across the platform serving over 500 collision repair shops.
- Designed and shipped a personalized KPI dashboard tracking revenue, jobs, and parts usage that improved client retention and product stickiness.
- Translated complex business workflows such as estimating, invoicing, parts ordering, and insurance claims into maintainable full-stack solutions.
- Served as technical liaison with 3rd-party teams: documented API defects via Postman, reported to external engineers, and drove fixes through to production.
- Bridged non-technical stakeholders and engineering by conducting client interviews, extracting requirements, and producing technical specifications and QA documentation.
Technologies: Python, Django, React, Node.js, PostgreSQL, Redis, Celery, Docker, Amazon Web Services (AWS), Claude Code, FastAPI, Full-stack, GitLab, Code review, GitHub, Jira, Linux, Agentic Coding
Full-stack Developer
2020 - 2023
Confidential Client
- Developed and maintained back-end features using PHP (Yii2) and Laravel, working across legacy and modern codebases simultaneously.
- Optimized critical database queries to reduce server load and improve response times on high-traffic reporting pages.
- Built the parts module from scratch as a full parts ordering and inventory subsystem. Designed and delivered the module end-to-end.
- Designed and implemented bidirectional API integrations with US and Canadian accounting systems.
- Wrote unit and integration tests using Jest and PHPUnit to ensure regression safety.
- Migrated legacy jQuery modules to modern Vue.js and React single-page applications backed by Django REST API.
Technologies: Django, React, Node.js, MySQL, Docker, Vue, PHP, Yii 2, Laravel, PostgreSQL, Full-stack, Code review, GitHub, Jira, Linux, WebSockets, CI/CD Pipelines
Full-stack Developer
2019 - 2020
Allot
- Developed Vue.js front-end modules for an enterprise network security management product in an international distributed team.
- Built Python automation tooling for marketing campaign infrastructure, demonstrating stack-agnostic adaptability by shipping production code outside the primary stack.
- Collaborated in an international distributed team using GitLab CI/CD, contributing to code reviews and maintaining production deployment pipelines.
Technologies: Python, GitLab CI/CD, Vue, Full-stack, GitHub, Jira, Linux, WebSockets, CI/CD Pipelines
Front-end Developer
2019 - 2019
Belitsoft
- Built the front end for a CRM system for medical clinics from scratch using React, Redux, and TypeScript, delivering UI modules end-to-end.
- Implemented client-facing interfaces based on foreign client specifications in an outsourced environment.
- Integrated front-end with back-end REST APIs, ensuring reliable data flow across core CRM workflows.
Technologies: React, TypeScript, Redux, JavaScript, HTML, CSS, RESTFul APIs, GitHub, Jira, Linux, CI/CD Pipelines
Full-stack Developer
2017 - 2019
Advisys
- Built complex financial planning features and interactive data visualizations using D3.js. Wrote Jest tests ensuring calculation accuracy.
- Ramped onto the React and Redux stack from scratch and delivered production features within the first weeks using an Agile workflow via Jira.
- Developed and maintained Laravel back-end APIs supporting financial planning workflows and insurance product calculations.
Technologies: React, Redux, Laravel, D3.js, MongoDB, Jest, Docker, Full-stack, GitHub, Jira, Linux
Full-stack Developer
2015 - 2017
BodyshopConnect
- Co-built a SaaS CRM platform for automotive body shops from scratch as an early-stage startup, contributing to architecture, implementation, and client delivery.
- Developed core platform modules using Yii2 and jQuery, working end-to-end from requirements to production deployment.
- Contributed to laying the technical foundation of a platform that grew into a multi-million dollar business serving hundreds of body shops across North America.
Technologies: PHP, Yii 2, MySQL, jQuery, JavaScript, Full-stack, Code review, GitHub, Jira, Linux
Project History
BodyshopConnect: SaaS CRM for Automotive Body Shops
http://www.bodyshopconnect.comA multi-tenant SaaS ERP/CRM platform for automotive body shops across North America, built from scratch as an early-stage startup. The platform grew into a multi-million dollar business serving 500+ body shops.
I joined as one of the first developers and contributed across the full stack over several years: designing and implementing core modules, including estimating, invoicing, parts ordering, insurance claims, and KPI dashboards. I also served as technical liaison with 3rd-party teams, documented API defects, and drove integrations with US and Canadian accounting systems.
I joined as one of the first developers and contributed across the full stack over several years: designing and implementing core modules, including estimating, invoicing, parts ordering, insurance claims, and KPI dashboards. I also served as technical liaison with 3rd-party teams, documented API defects, and drove integrations with US and Canadian accounting systems.
Internal LMS: Complete System Delivered in 20 Days
A standalone learning management system (LMS) built for an internal use case within a multi-tenant SaaS platform serving 500+ automotive body shops across North America. The entire system was designed and delivered end-to-end in just 20 days, from requirements and system design to front end, back end, and deployment. I was solely responsible for the full delivery cycle: database schema, API design, front-end SPA, async task processing, and containerized deployment on AWS.
Tech stack: React SPA (frontend), FastAPI (backend), PostgreSQL, Redis, Celery for async tasks, fully Dockerised and deployed on AWS.
Tech stack: React SPA (frontend), FastAPI (backend), PostgreSQL, Redis, Celery for async tasks, fully Dockerised and deployed on AWS.
Education
2008 - 2012
Bachelor's Degree in Software Engineering
Belarusian State University - Minsk, Belarus
Certifications
JUNE 2026 - PRESENT
React Essential Training
JUNE 2026 - PRESENT
Building a Recommendation System with Python Machine Learning and AI
JUNE 2026 - PRESENT
Advanced Python Projects: Build AI Applications
JUNE 2026 - PRESENT
Claude Code in Action by Anthropic
Skills
Libraries/APIs
React, jQuery, Node.js, D3.js, Vue
Tools
Jira, GitHub, Celery, Claude Code, GitLab CI/CD, GitLab
Languages
Python, PHP, JavaScript, TypeScript, HTML, CSS
Frameworks
Django, Laravel, Redux, Jest, Yii 2
Paradigms
Object-oriented Programming (OOP)
Storage
PostgreSQL, MySQL, Redis, MongoDB
Platforms
Docker, Linux, Amazon Web Services (AWS)
Other
Code review, Algorithms, Software Architecture, RESTFul APIs, FastAPI, Full-stack, Artificial Intelligence (AI), Front-end Development, WebSockets, CI/CD Pipelines, Agentic Coding, AI-augmented Software Engineering (AIASE), Machine Learning
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