A remote Lead or Senior backend role where I own architecture and production systems: AI platforms, distributed systems, or building a product from scratch. Full-time or part-time, as a contractor (B2B) or employee. Based in Spain (CET), happy to overlap with US Eastern hours.

Filip Stoika
@filipstoika
Lead Backend Engineer at Harmix, building Pam’s cloud-native AI platform and distributed services handling 2,000–3,000 RPS.
What I'm looking for
At Harmix, I joined as the first engineer and designed the cloud-native backend architecture and GCP infrastructure for Pam, an AI platform backed by a $1M funding round. I built distributed microservices supporting 100+ paying customers and designed the platform’s AI memory and retrieval architecture with researchers.
At SBC Performance, I maintained backend services handling 2,000+ RPS and automated deployments, reducing deployment time from about 30 minutes with planned downtime to about five minutes with zero downtime. Across my other roles, I’ve developed Python backend services, APIs, and document-processing features, including a reusable OCR library based on AWS Textract.
Experience
Work history, roles, and key accomplishments
Lead Backend Engineer
Harmix
Nov 2025 - Present (11 months)
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. Grew and led an engineering team from 1 to 4 developers, owning technical planning, architecture decisions, code reviews, delivery, and mentoring.
Senior Software Engineer
SBC Performance
Sep 2024 - Nov 2025 (1 year 2 months)
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. Reduced deployment time from ~30 minutes with planned downtime to ~5 minutes with zero downtime, automating application deployment and database migration workflows.
Python Backend Developer
OSF Digital
Aug 2023 - Aug 2024 (1 year)
Developed backend functionality for OPTX, a large-scale financial platform, using FastAPI and SQLAlchemy. Optimized PostgreSQL queries using raw SQL, indexes, and materialized views, improving database performance.
Mentor & Teacher
GoIteens
Feb 2023 - Dec 2023 (10 months)
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.
Python Engineer
Quantum Inc
Feb 2022 - Aug 2023 (1 year 6 months)
Developed and maintained backend services for a platform focused on automated invoice processing and document management. Designed and fully developed a full-stack service using Django REST Framework, Nginx, and React.js for a client business requirement.
Python Backend Developer
Ronis BT
Jul 2021 - Feb 2022 (7 months)
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.
Python Developer
Atomiz
Dec 2020 - Aug 2021 (8 months)
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.
Education
Degrees, certifications, and relevant coursework
National Aerospace University
Bachelor, Computer Science
2020 - 2024
Grade: 90/100
Bachelor's degree in Computer Science from National Aerospace University, graduated with a score of 90 out of 100.
Availability
Location
Authorized to work in
Salary expectations
Social media
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