Senior Fullstack Developer (Typescript) @ Square One Resources

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.

,[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] Requirements: TypeScript, PostgreSQL, REST API, Kafka, Claude Code , OpenAI Codex Additionally: Sport subscription, Private healthcare.