Senior Full Stack Engineer
Appliscale
Kraków, Pl-06, Poland • 32m ago • Remote
Senior
Remote
19 - 25 PLN/yr
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Quick Facts
Role: Senior Full Stack Engineer
Domain: Sports-training platform (coach web console + athlete mobile-first experience)
Focus: End-to-end product engineering with daily AI-assisted development
Description
Build end-to-end features for a sports-training platform connecting a web console for coaches with a mobile-first experience for athletes. You’ll work in a modern TypeScript stack with Next.js, Supabase/Postgres (including security policies), and Clerk-based authentication/authorization while owning backend and UI development. This is a hands-on product engineering role where AI is part of the daily workflow.
Role Responsibilities
Build and ship full-stack features end-to-end with TypeScript, Next.js 16 (App Router, Server Components, Server Actions) and React 19
Design Postgres schemas in Supabase and secure them with Row-Level Security policies, migrations, and generated types
Implement auth and role-based access with Clerk (organizations, roles, permissions) integrated with Supabase RLS
Build mobile-first athlete screens and data-dense coach console screens using Tailwind CSS and shadcn/ui
Keep domain logic in clean, testable services; write unit tests and integration tests against a local Supabase
Deploy on Vercel and maintain infrastructure with Terraform
Monitor and triage production issues with Sentry
Use AI coding tools (e.g., Claude Code) daily to accelerate development
Collaborate with product and design and participate in code reviews
As a senior: own features from idea to production, make and document architecture decisions, and mentor others
Requirements
5+ years of commercial experience
Strong TypeScript and JavaScript fundamentals
Hands-on experience with React and Next.js (App Router), including the server/client component boundary
Solid SQL and PostgreSQL fundamentals: schema design, indexes, migrations
Experience with authentication and authorization in web apps
Understanding of Git workflows, CI/CD pipelines (GitHub Actions), and code quality tools (ESLint, Prettier)
Comfortable working with automated tests and code reviews
Regularly uses AI-assisted development tools (e.g., Claude Code)
Critically reviews AI-generated code and knows when not to trust it
Uses AI for real productivity gains
Understands the “why” behind features and cares about UX, especially on mobile
Comfortable working closely with product and design stakeholders
Good English communication skills (written and spoken)
Benefits
Daily use of AI coding tools to accelerate development
Full ownership of features from idea to production, including architecture decisions and mentorship
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