8+ Years
Python backend engineering experienceAvailable for backend engineering roles and contracts
Aleksis Lesieur
Senior Backend Engineer with 8+ years of experience designing and scaling Python-based systems for SaaS and data-intensive platforms.
99.9% Uptime
Service reliability achieved at Tapestry-58% Cost
Infrastructure savings from Heroku migration+45% Throughput
Data ingestion improvement at Footy LabsProfessional Summary
Delivered measurable impact through backend optimization, infrastructure modernization, CI/CD acceleration, and enhanced production reliability.
Specialized in Django, FastAPI, data pipelines, scalable distributed architectures, and cloud-native deployments.
Contact Snapshot
- Vilnius, Vilniaus, Lithuania
- aleksislesieur@gmail.com
- https://t.me/WebFiveFingers
- https://x.com/webfivefingers
- https://github.com/fiv3fingers
Core Technical Skills
Main technologies and tools used for modern web product delivery.
Backend Development
Databases and ORM
Cloud and DevOps
AI, Architecture, and Testing
Professional Experience
Roles and outcomes from backend, data, and platform engineering work.
10/2025 - Present
Software Engineer (Contractor), Footy Labs — Vilniaus, Lithuania
07/2024 - 09/2025
Software Developer (Contractor), Tapestry — New York, NY (Global Remote)
01/2023 - 06/2024
Frontend Developer (Full-time), Refooro — Vilniaus, Lithuania (Remote)
03/2020 - 08/2022
Backend Developer (Full-time), Foster Marketplace — Phoenix, Arizona (Global Remote)
08/2018 - 12/2019
Web Developer (Internship), Cingant — Stockholm, Sweden (Remote)
Projects and Portfolio
Selected platforms and websites built for active business use.
Python Backend
Footy Labs
Python + FastAPI + Data Pipeline + CI/CD + Google Cloud
Architected scalable Python ETL pipelines for structured sports data ingestion, processing large datasets including players, clubs, leagues, and agencies with normalized relational mapping.
Visit projectRust Backend
Stakit
Rust + Actix Web + PostgreSQL + Docker + CI/CD + Twitter API
Developed Stakit Twitter Raid System Backend Development, a Rust-based backend service for managing Twitter raid events, integrating with the Twitter API to handle real-time data processing.
Visit projectExpress.js Backend
Vrbs DAO Platform
Typescript + Express.js + PostgreSQL + Redis + CI/CD + AWS
Delivered a Typescript Backend system integrating with Auction Smart Contract, and DAO Proposals Management System, handling high-throughput transactions and ensuring data integrity with PostgreSQL.
Visit projectPrediction Market
FactCheck.fun Prediction Market
Typescript + Express.js + REST API + PostgreSQL + Docker + CI/CD
Shipped a backend system for a predicition market on EVM, interacting with prediction market samrt contract, handling user bets, and providing real-time updates on market outcomes.
Visit projectPython Backend
topchretien.com
Python + Django + REST API + JavaScript + CI/CD + Payment Gateway Integration + Security
Built a donation platform for a non-profit organization, integrating with payment gateways and providing a seamless user experience for donors.
Visit projectRust Backend
Foster Marketplace
Rust + Rocket + PostgreSQL + Diesel + Tokio + Async
Orchestrated scalable Rust backend architecture integrating APIs and smart contracts, handling 10k+ monthly marketplace transactions with reduced latency and improved throughput.
Visit projectFrequently Asked Questions
Quick answers on process, technology, and support.
I work on API platforms, SaaS backends, data pipelines, real-time services, and system modernization projects. Most engagements focus on scale, reliability, and delivery speed.