10/14/2026 updated
100 % available
Senior Full Stack Engineer | Python & React | FinTech, AI/ML, Web3
Lisbon, Portugal
Only remote
Master of Computer ScienceAbout me
Strong Middle Python Developer specializing in FastAPI, async REST APIs, and scalable backend systems. Experienced in production AI/ML and LLM integrations, SQL/NoSQL databases, Docker, and cloud environments. Focused on performance, security, clean code, and end-to-end feature ownership.
HTMLJavaScriptCascading Style Sheets (CSS)DjangoGitHubJSONPostgreSQLMySQLRedisSeleniumSQL DatabasesSQLAlchemyOop LanguageReact.jsGit
Python Backend Development
Expertise in building scalable backend services and REST APIs using Python frameworks such as FastAPI, Django, Django REST Framework and Flask, including JWT authentication, API integration, API validation and access control.
React & Frontend Engineering
Proficiency in developing modern, responsive user interfaces with React, Next.js, React Native, TypeScript and NextAuth, with a focus on performance optimization and Core Web Vitals.
FinTech & AI/ML Integration
Strong background in digital banking, payments, transactions and financial data integrations (Plaid, Salt Edge, FX APIs), combined with hands-on AI/ML integration including predictive models, sentiment analysis, auto-categorization and AI assistants.
Cloud & DevOps
Deployment and operation of services on AWS and GCP using Docker, CI/CD pipelines, Git, Vercel and automated deployment workflows for scalable cloud infrastructure.
Database Management
Design and optimization of PostgreSQL and MongoDB schemas and queries, as well as Redis caching and data flow modeling for financial applications.
Web3 & Crypto Trading
Development of crypto exchange integrations and algorithmic trading systems supporting strategies such as Grid, DCA, Momentum and Mean Reversion, including backtesting and risk management.
Microservices Architecture
Design and implementation of microservices using FastAPI, Celery and Node.js, with secure API-key vaults and Dockerized deployments on cloud platforms.
Agile & Cross-functional Collaboration
Experience working in Agile teams with code review, automated testing, production support and cross-functional collaboration with product managers, designers and QA.
Expertise in building scalable backend services and REST APIs using Python frameworks such as FastAPI, Django, Django REST Framework and Flask, including JWT authentication, API integration, API validation and access control.
React & Frontend Engineering
Proficiency in developing modern, responsive user interfaces with React, Next.js, React Native, TypeScript and NextAuth, with a focus on performance optimization and Core Web Vitals.
FinTech & AI/ML Integration
Strong background in digital banking, payments, transactions and financial data integrations (Plaid, Salt Edge, FX APIs), combined with hands-on AI/ML integration including predictive models, sentiment analysis, auto-categorization and AI assistants.
Cloud & DevOps
Deployment and operation of services on AWS and GCP using Docker, CI/CD pipelines, Git, Vercel and automated deployment workflows for scalable cloud infrastructure.
Database Management
Design and optimization of PostgreSQL and MongoDB schemas and queries, as well as Redis caching and data flow modeling for financial applications.
Web3 & Crypto Trading
Development of crypto exchange integrations and algorithmic trading systems supporting strategies such as Grid, DCA, Momentum and Mean Reversion, including backtesting and risk management.
Microservices Architecture
Design and implementation of microservices using FastAPI, Celery and Node.js, with secure API-key vaults and Dockerized deployments on cloud platforms.
Agile & Cross-functional Collaboration
Experience working in Agile teams with code review, automated testing, production support and cross-functional collaboration with product managers, designers and QA.
Experience
Professional experience5 - 10 years
Freelancer since2020
Languages
GermanFluentEnglishNative speakerUkrainianNative speaker
Project history
Built a personal finance and budgeting platform (web + mobile) with responsive web and mobile apps, real-time analytics dashboards, budgeting tools, expense splitting and live currency conversion. Developed transaction categorization, analytics and expense-sharing APIs with Python and FastAPI, secured with NextAuth and JWT. Applied Python ML models for auto-categorization and cash-flow scoring. Integrated Plaid, Salt Edge and live FX APIs. Deployed a PostgreSQL and Redis backend in Docker with CI/CD pipelines on Vercel and AWS.
Built an automated crypto trading platform connected to major exchanges, running Grid, DCA, Momentum and Mean Reversion strategies with live and paper trading, backtesting and risk management. Developed a strategy marketplace and AI assistant with React and React Native dashboards. Built FastAPI and Celery microservices on PostgreSQL and Redis, Dockerized and deployed to AWS/GCP with CI/CD.
Python AI development at a Python software engineering company.