We are looking for Backend Developer (PHP + AI Automation):

Backend Development & Architecture

Design and develop the backend of the platform using PHP.
Build REST APIs for integrations with external systems (advertisers, tracking platforms, traffic sources).
Design database schemas, optimize queries, and manage database migrations.
Implement core business logic, including traffic routing, offer distribution, and payout calculations.

Process Automation

Design and build end-to-end automation workflows using n8n or similar workflow orchestration tools.
Automate operational processes, including postback processing, moderation, and reporting.
Integrate with external APIs such as tracking systems, payment providers, and CRM platforms.
Configure rate limiting, retry logic, fault tolerance, and pipeline monitoring.

AI Integration & Optimization

Integrate LLM APIs to automate routine tasks such as content generation, classification, and analytics.
Develop prompts for platform-specific use cases, including structured outputs and batch processing.
Build optimization algorithms for traffic allocation and conversion performance.

Requirements

Backend Development
Strong PHP skills with proven experience building backend systems.
Solid understanding of OOP, SOLID principles, design patterns, and software architecture.
Strong knowledge of PostgreSQL and/or MySQL, including complex queries, JSONB, transactions, and concurrent access.
Experience designing and integrating REST APIs.
Practical experience with Docker (docker-compose, networking, volumes).
Daily experience using Git and participating in code reviews.

AI & Automation

Experience with AI-assisted development ("vibe coding") using tools such as Cursor, Claude Code, GitHub Copilot, or similar.
Hands-on experience integrating LLM APIs (OpenAI, Claude, OpenRouter), including prompt engineering, structured outputs, and response processing.
Experience with n8n or similar workflow orchestration platforms (Make, Zapier) for building complex automation scenarios.
Understanding of AI model fundamentals, including tokenization, context windows, temperature settings, and Retrieval-Augmented Generation (RAG).

General

Basic understanding of DNS, SSL/TLS, and CDN technologies.
Ability to work independently: understand requirements, break down tasks, and deliver solutions without micromanagement.

Nice To Have

Experience with additional programming languages such as Python, Node.js, or Go.
Experience with Redis (caching, queues, rate limiting).
Experience with Cloudflare API and Cloudflare Workers.
Background in affiliate marketing or CPA networks, including traffic flows, conversion tracking, and postback mechanisms.
Experience with vector databases such as Qdrant or Pinecone for search and classification tasks.
Experience with Supabase and message brokers (RabbitMQ, Redis Streams).
Experience fine-tuning AI models and working with local LLMs (Ollama, vLLM).

What We Offer

Fully remote, full-time position.
Flexible working hours with overlap during the team's core collaboration hours.
Competitive compensation based on your experience and interview results.
NDA required before joining the project.
Modern technology stack and rapidly evolving products.
Small, highly technical team with minimal bureaucracy and a strong engineering culture.

Format: Full-time

Start date: As soon as possible

Location: Ukraine, Kyiv

Backend developer + AI

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