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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