Filip

Filip Stoika
Lead Backend Engineer | Senior Software Engineer
Spain | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | Telegram: @philipww | LinkedIn | GitHub

Experienced software engineer specializing in scalable backend architecture, cloud infrastructure, and distributed systems.
Proven experience leading and mentoring engineering teams, driving architectural decisions, and building reliable, high-
performance systems that scale with business needs.

Work Experience
Lead Backend Engineer — Harmix | Nov 2025 - Present
Joined as the first engineer, designing and building the cloud-native backend architecture and GCP infrastructure for Pam,
an AI platform backed by a $1M funding round.
Designed and maintained a distributed microservices architecture handling 2,000–3,000 RPS and supporting 100+ paying
customers across 8+ services and 3 environments.
Built the CI/CD and Infrastructure as Code foundation using GitHub Actions and Terraform, managing ~24 deployment
pipelines and enabling zero-downtime production deployments.
Grew and led an engineering team from 1 to 4 developers, owning technical planning, architecture decisions, code reviews,
delivery, and mentoring.
Designed the platform's AI memory and retrieval architecture with researchers and optimized LLM workflows to balance
quality, latency, and infrastructure costs.
Led engineering initiatives toward SOC 2 and GDPR compliance, strengthening IAM, secrets management, infrastructure
security, and audit processes.
Worked closely with CTO, CEO, researchers, and customers to translate product requirements into scalable technical
solutions and production-ready features.
Tech Stack: Python, FastAPI, PostgreSQL, GCP, Terraform, Docker, GitHub Actions, Prometheus, Grafana, LLMs, MCP

Senior Software Engineer — SBC Performance | Sep 2024 – Nov 2025
Designed and maintained a distributed backend ecosystem handling 2,000+ RPS across multiple services, including
Backend Service, automated video translation, subtitle generation and other services.
Designed and implemented integrations with OpenAI, DeepL, HeyGen, Captions, and Slack, enabling automated content
processing and internal workflows.
Designed and implemented CI/CD pipelines with GitHub Actions across multiple environments, replacing manual
deployment workflows.
Reduced deployment time from ~30 minutes with planned downtime to ~5 minutes with zero downtime, automating
application deployment and database migration workflows.
Automated deployments to GCP Cloud Run and dedicated servers, improving deployment consistency and reducing
operational overhead.
Refactored legacy backend code and introduced dependency injection, significantly improving modularity, testability, and
maintainability.
Expanded automated unit test coverage across refactored services, improving regression protection and code reliability.
Implemented monitoring and observability using Grafana and Prometheus to track service health and performance.
Developed new backend functionality, investigated production incidents, performed root-cause analysis, and resolved bugs
across distributed services.
Tech Stack: Python, FastAPI, SQLAlchemy, PostgreSQL, MongoDB, Docker, GCP (Cloud Run, Google Drive), GitHub Actions,
Grafana, Prometheus, OpenAI, DeepL, HeyGen, Slack, Jira

Python Backend Developer — OSF Digital | Aug 2023 – Aug 2024
Developed backend functionality for OPTX, a large-scale financial platform, using FastAPI and SQLAlchemy.
Designed and implemented API features and integrations with external financial APIs, including EquityTouch.
Optimized PostgreSQL queries using raw SQL, indexes, and materialized views, improving database performance.
Researched and implemented approaches to improve the performance, reliability, and maintainability of existing services.
Collaborated closely with frontend engineers to design and deliver API functionality.
Performed debugging, root-cause analysis, and production bug fixing across backend services.
Tech Stack: Python, FastAPI, SQLAlchemy, PostgreSQL, Docker, REST APIs, Raw SQL

Python Engineer — Quantum Inc | Feb 2022 – Aug 2023
Developed and maintained backend services for a platform focused on automated invoice processing and document
management.
Implemented API features, business logic, bug fixes, and backend refactoring.
Designed and implemented bookkeeping functionality for tracking invoice processing and payment statuses.
Developed a reusable OCR library based on AWS Textract for automated document data extraction.
Worked with AWS cloud infrastructure, including EC2, S3, SQS, Lambda, and CloudWatch.
Designed and fully developed a full-stack service using Django REST Framework, Nginx, and React.js for a client business
requirement.
Worked with OCR, Tesseract, NumPy, Pandas, and computer vision for document processing.
Tech Stack: Python, Django, Django REST Framework, AioHTTP, MongoDB, Docker, AWS (EC2, S3, SQS, Lambda, CloudWatch,
Textract), Tesseract, NumPy, Pandas, Computer Vision

Python Backend Developer — Ronis BT | Jul 2021 – Feb 2022
Developed backend functionality for internal CRM and pricing platforms supporting a luxury e-commerce retailer.
Implemented advanced filtering, role-based access control, and bulk pricing operations using Pyramid and MongoDB.
Designed and implemented REST API endpoints and backend business logic.
Collaborated with QA and product teams throughout feature development and delivery.
Participated in code reviews and production deployments, including zero-downtime deployment workflows.
Tech Stack: Python, Pyramid, MongoDB, REST APIs, Docker, Nginx, Git, Jira, HTML, CSS, JavaScript

Python Developer — Atomiz | Dec 2020 – Aug 2021
Developed and maintained backend features and internal tools using Django and Flask.
Built and maintained REST APIs serving 10K+ users, including authentication, file uploads, and background task
processing.
Optimized database queries and backend logic to improve application performance.
Increased automated test coverage by 30%, improving code reliability and reducing regression risks.
Participated in code reviews, technical discussions, and team planning.
Tech Stack: Python, Django, Flask, Django REST Framework, PostgreSQL, Docker, Git, Celery, Pytest

Technical Skills
Languages: Python, SQL, Bash
Backend & APIs: FastAPI, Django, Django REST Framework, Flask, Pyramid, REST APIs, WebSockets, GraphQL, asyncio
Databases & Storage: PostgreSQL, MongoDB, Redis
Cloud & Infrastructure: GCP, AWS, Cloud Run, Compute Engine, EC2, S3, SQS, Lambda, Docker, Nginx, Terraform
CI/CD & DevOps: GitHub Actions, GitLab CI, CI/CD, Infrastructure as Code, deployment automation, zero-downtime
deployments
Testing & Code Quality: Pytest, unittest, unit testing, TDD, code review, dependency injection
Messaging & Distributed Systems: RabbitMQ, Kafka, Celery, MCP
Observability & Security: Prometheus, Grafana, CloudWatch, IAM, secrets management, GDPR/SOC 2 compliance
AI & Data Processing: OpenAI, LLMs, OCR, AWS Textract, Tesseract, NumPy, Pandas, Computer Vision
Tools: Git, Linux, Jira, Bash scripting

Education
National Aerospace University Bachelor, Computer Science | Graduated 90/100 | 2020 – 2024

Mentor & Teacher at GoIteens (then self-employed) | Feb 2023 - Dec 2023

Taught Python to teenagers through an educational initiative, focusing on core programming concepts and hands-on
projects. Delivered weekly lessons on basics, data structures, and OOP, and provided individual support to help students
build confidence and problem-solving skills.