About this role

Senior Fullstack Developer (Typescript) Square One Resources Daily tasks: - Design, develop, and maintain scalable full-stack applications - Build modern web applications and backend services using TypeScript - Develop and integrate REST APIs - Work with event-driven architectures and distributed systems - Contribute to technical decisions and software architecture improvements - Write clean, maintainable, and production-ready code - Collaborate with international teams in a remote environment - Use AI-assisted development tools to support everyday engineering tasks Musts: TypeScript, PostgreSQL, REST API, Kafka, Claude Code , OpenAI Codex 8+ years of professional experience as a Full-Stack Software Engineer Strong experience building scalable, production-grade software systems Excellent knowledge of TypeScript across the full stack Solid experience with PostgreSQL Strong understanding of REST API design and development Hands-on experience with Kafka or other event-streaming platforms Experience working with distributed software systems Practical experience using AI-assisted coding tools (e.g.

Claude Code, OpenAI Codex, or similar) Strong English communication skills Located in Poland or another EU country Optional Experience developing commercial SaaS or on-premise software products Background in enterprise software environments Familiarity with cloud-native architectures and modern DevOps practices You will join a distributed engineering team responsible for building and improving production-grade software solutions used by enterprise customers.

In this role, you will work on scalable backend services and modern web applications, contributing to reliable, maintainable, and high-performing systems. You will collaborate with experienced engineers and leverage modern AI-assisted development tools to improve development speed, code quality, and engineering efficiency.

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