Senior Full-Stack Developer/Tech Lead

The role

The Senior Full-Stack Developer/Tech Lead will take full technical responsibility for a new product in the HOLYWATER TECH ecosystem. This includes designing architecture, developing key functionality, and leading the engineering team.

What you will do

• Take full technical responsibility for a new product in the HOLYWATER TECH ecosystem
• Design architecture, develop key functionality, and define technical priorities
• Develop canvas workflow editor and AI-agent including SSE-streaming, state saving, and connection recovery
• Build and develop AI/LLM-agents and generative pipelines
• Write fullstack-code (backend ~50%, frontend ~20%, infrastructure ~20%)
• Launch product and payment experiments end-to-end
• Lead Engineering through planning, decomposition, task distribution, code review, and release control

Required qualifications

• 5+ years of engineering experience
• At least 3 years of production development on React/TypeScript
• Proven experience designing architecture and launching an AI product in production
• Senior+/Staff level expertise in React, TypeScript, Next.js
• Strong backend skills in Python, FastAPI, PostgreSQL, API, SSE, asynchronous processes, and service architecture
• Practical experience with LLM in production (AI agents, tool calling, streaming, orchestration)
• Confident work with AWS, Kubernetes, CI/CD, Sentry, Grafana
• Technical leadership experience (architectural decisions, planning, task setting, code review, engineer coordination)
• Experience developing payment funnels, A/B tests, and product analytics integration
• Daily work with AI coding agents (Claude Code, Cursor, Codex or analogues)
• Extreme ownership and product approach

Nice to have

• Experience in AI video generation or AI filmmaking
• Experience with canvas/workflow-editors (React Flow)
• Experience with Temporal and distributed asynchronous systems
• Tech lead experience in a small AI startup or B2C SaaS

Benefits

• Fast professional growth
• Compensation for professional training and language learning (including Ukrainian)
• Work from home, office in Kyiv (Podil) or Lviv, or abroad
• Equipment and services for work
• 20 days of vacation plus official holidays
• Unlimited sick leaves
• Compensation for sports
• Medical insurance in Ukraine (after probation)
• Corporate doctor services
• Mental health support

About the company

HOLYWATER TECH is a technology company that creates entertainment products at the intersection of human creativity and artificial intelligence. Their ecosystem includes My Drama, My Passion, and My Muse.