26.09.2026 aktualisiert
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Back-End Developer | Python & Rust | Fintech, AI Voice Agents, Trading Platforms
Bar, Montenegro
Nur Remote
Specialist Degree in Computer SecurityÜber mich
Backend developer and tech lead, 4.5 years in Python and Rust. Built fintech, trading, pharma, mining and industrial systems, AI voice agents and LLM integrations. Hexagonal architecture, FastAPI, Actix, PostgreSQL, Kafka. Based in Montenegro, remote only.
Skills
APIsDevOpsPythonMessaging Application Programming InterfaceOAuthRabbitMQRedisSwaggerOpenapiAsteriskRust (Programming Language)FlaskBackendFastAPIBackend-programmierung
Python Back-End Development
Extensive experience with Python frameworks and libraries including FastAPI, Flask, SQLAlchemy, Alembic, Pydantic, Asyncio, Pytest, Aiohttp, BeautifulSoup, Playwright, Threading, Multiprocessing, PyJWT, Psycopg2, Dishka, and Celery for building scalable and high-performance back-end systems.
Rust Microservices & Systems Programming
Proficiency in Rust using Actix-web, Tokio, SQLx, PyO3, serde_json, Rayon, WebAssembly (wasm-bindgen), and Cloudflare Workers (worker-rs) for building low-latency microservices and high-performance systems.
AI & LLM Integration
Hands-on experience with OpenAI and Anthropic APIs including OpenAI Realtime API for voice agents, headless Claude Code agents, retrieval-augmented generation (RAG), prompt engineering, LLM output validation, accuracy benchmarking, and AI-assisted development.
Databases & Messaging
Solid knowledge of PostgreSQL, Redis, RabbitMQ, Apache Kafka, and MQTT for data storage, caching, and asynchronous messaging in distributed systems.
APIs & Protocols
Experience designing and implementing REST APIs, WebSocket, gRPC, Swagger/OpenAPI, and RTP/SIP (Asterisk ARI) for diverse communication and integration requirements.
DevOps & Cloud Infrastructure
Practical knowledge of Docker, Linux, Git, Bash, AWS (EC2, S3, RDS, SQS), Kubernetes, and CI/CD pipelines using GitHub Actions and GitLab CI, as well as Nginx for deployment and infrastructure management.
Security Architecture
Competence in Keycloak, OAuth 2.0, JWT, and security architecture design, including access control models, network segmentation, traffic encryption, security event logging, backup, and vulnerability management.
Hexagonal & Microservices Architecture
Experience designing systems from scratch using hexagonal architecture to ensure scalability and domain logic isolation, as well as defining microservices interaction models.
Telephony & Voice Agent Systems
Practical experience building telephony solutions using Asterisk ARI, GSM gateways, real-time RTP audio pipelines into OpenAI Realtime API, scheduled auto-dial campaigns, and multi-gateway routing.
Extensive experience with Python frameworks and libraries including FastAPI, Flask, SQLAlchemy, Alembic, Pydantic, Asyncio, Pytest, Aiohttp, BeautifulSoup, Playwright, Threading, Multiprocessing, PyJWT, Psycopg2, Dishka, and Celery for building scalable and high-performance back-end systems.
Rust Microservices & Systems Programming
Proficiency in Rust using Actix-web, Tokio, SQLx, PyO3, serde_json, Rayon, WebAssembly (wasm-bindgen), and Cloudflare Workers (worker-rs) for building low-latency microservices and high-performance systems.
AI & LLM Integration
Hands-on experience with OpenAI and Anthropic APIs including OpenAI Realtime API for voice agents, headless Claude Code agents, retrieval-augmented generation (RAG), prompt engineering, LLM output validation, accuracy benchmarking, and AI-assisted development.
Databases & Messaging
Solid knowledge of PostgreSQL, Redis, RabbitMQ, Apache Kafka, and MQTT for data storage, caching, and asynchronous messaging in distributed systems.
APIs & Protocols
Experience designing and implementing REST APIs, WebSocket, gRPC, Swagger/OpenAPI, and RTP/SIP (Asterisk ARI) for diverse communication and integration requirements.
DevOps & Cloud Infrastructure
Practical knowledge of Docker, Linux, Git, Bash, AWS (EC2, S3, RDS, SQS), Kubernetes, and CI/CD pipelines using GitHub Actions and GitLab CI, as well as Nginx for deployment and infrastructure management.
Security Architecture
Competence in Keycloak, OAuth 2.0, JWT, and security architecture design, including access control models, network segmentation, traffic encryption, security event logging, backup, and vulnerability management.
Hexagonal & Microservices Architecture
Experience designing systems from scratch using hexagonal architecture to ensure scalability and domain logic isolation, as well as defining microservices interaction models.
Telephony & Voice Agent Systems
Practical experience building telephony solutions using Asterisk ARI, GSM gateways, real-time RTP audio pipelines into OpenAI Realtime API, scheduled auto-dial campaigns, and multi-gateway routing.
Erfahrung
Berufserfahrung0 - 5 Jahre
Freelancer seit2025
Sprachen
EnglishverhandlungssicherRussianMuttersprache
Projekthistorie
Built two Chrome extensions from scratch and the full backend for a third. Developed HS Code Finder with Rust backend on Cloudflare Workers using LLM-based customs code classification, Google authentication, crypto payments, and credit billing. Developed YT Synchroniser for synchronized YouTube playback via own WebSocket server in Rust. Built the Drawing Online backend with real-time drawing sync on a Rust server, drawing analytics collection, and an MCP server for analysis.
Led the Cryptocurrency Portfolio Management Service as team lead: planned every stage, estimated effort, coordinated a frontend/DevOps team of 3, managed client requirements, and delivered the product end to end. Designed backend using hexagonal architecture with FastAPI, Uvicorn, async SQLAlchemy, Dishka DI, aiohttp, and PyJWT.
Worked as Back-end Developer and Technical Lead on multiple projects including LogSheet (production logbook service with telephony and AI voice agents), Market Monitoring & Patent Purity Services (hexagonal architecture, FastAPI, Keycloak, Redis, JWT), Company Registry Data Pipeline (parsing 4.2M company records), Industrial Machine-Vision System (security consultant for mining company), Automated Futures Trading Platform (Rust microservices, Actix-web, Tokio, PnL tracking), Pump Equipment Control Service (IoT architecture with MQTT and Rust), Freight Control System (RabbitMQ, Kafka, driver tracking), and Currency Arbitrage Platform (Python and Rust microservices for smart currency exchange).