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Maksim Vasilenka

@maksimvasilenka

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Senior Python Engineer building production AI and digital product backends with FastAPI, Django, and LLMs.

Belarus

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What I'm looking for

I want to own backend architecture and ship production LLM features—RAG, guardrails, and async services—partnering with product teams to deliver reliable digital experiences with strong engineering discipline and observability.

I’m a Senior Python Engineer with 6+ years building production software for digital product teams, focused on AI software and digital products. I own software architecture, feature delivery, and development end-to-end—from API design through deployment.

My work ships production LLM capabilities: OpenAI + Claude integrations, ML inference in async worker tiers, and RAG-style retrieval with prompt templates, guardrails, and cost/latency controls. I lead migrations and service clarity efforts, including a Django → FastAPI migration on a live B2B product (~35% fewer prod bugs) and delivery of conversational chatbot flows (Telegram bot + API backend) with clearer service architecture and async workers.

Currently, as a Staff Engineer for a Corporate AI SaaS platform (B2B digital product), I lead multi-tenant backend architecture with REST APIs, async services, design reviews, and mentoring through code review. I collaborate cross-functionally with product and marketing stakeholders, support public landing pages and in-product messaging templates, and keep quality high using testing (pytest), CI, and observability on Kubernetes environments.

Experience

Work history, roles, and key accomplishments

Current

Staff Engineer (Backend)

Current

Corporate AI SaaS Platform

Jan 2025 - Present (1 year 5 months)

Led backend software architecture for a multi-tenant B2B AI SaaS, defining REST APIs and async worker services with design reviews and mentoring. Built production generative AI features integrating OpenAI and Claude with STT/LLM pipelines, prompt templates, and reliability controls (retries/back-pressure).

fastAPI Django OpenAI API Claude RESTful API Design Async Workers PostgreSQL Redis Kubernetes Prompt Engineering

Backend Developer

Qantev

Jan 2024 - Aug 2025 (1 year 7 months)

Delivered live B2B SaaS backend improvements by migrating Django to FastAPI with an OpenAPI-first REST API and a zero-downtime rollout. Implemented ML document inference via isolated worker tiers and built Kafka-based, idempotent event flows for ingestion and tracking.

Django fastAPI PostgreSQL Kafka OpenAPI Azure Service Bus Webhooks SQL Optimization Pytest

Backend Developer

Oscar Health

Mar 2023 - Mar 2024 (1 year)

Built and operated event-driven microservices on Kafka under seasonal peak load, focusing on high availability and service architecture. Partnered with React/Node BFF teams to support web-facing functionality and improved production debugging and observability on AWS and Kubernetes.

AWS Kafka gRPC Kubernetes PostgreSQL Event Driven Architecture service reliability Observability Debugging Pytest

Backend Developer

Kitchenhub

Feb 2021 - Mar 2023 (2 years 1 month)

Owned partner integrations for delivery networks by normalizing external APIs, implementing retries and rate limits, and reconciling high-volume sync/status data. Designed an OpenAPI REST layer to support both internal consumers and external partner adapters with Dockerized deployments.

fastAPI GCP Redis Docker OpenAPI Data Reconciliation Linux