Software Engineer | Propr.xyz

SwissBorg; Poland; On-site; PLN 233,743 - 318,741; Full time

Job summary

SwissBorg is seeking an exceptional Backend Developer to design and implement backend services in the trading domain. The ideal candidate has over 5 years of production backend experience, strong TypeScript skills, and familiarity with trading systems. Responsibilities include owning features from schema to UI integration, and writing integration tests. Experience with modern Node.js frameworks and financial infrastructures is essential for success in this role. Join us in leveraging blockchain technology to enhance efficiency in prop firms.

Qualifications

• 5+ years production backend experience.
• Strong TypeScript or other strongly typed language background.
• Experience with trading systems or financial infrastructure.

Responsibilities

• Design and implement backend services across the trading domain.
• Own features end to end: schema, API, tests, UI integration.
• Write integration tests against real dependencies.

Skills

TypeScript

Node.js

SQL

Integration Testing

React

Tools

NestJS

AWS

Terraform

Job description

Propr.xyz is building a new Operating System for prop firms, helping them leverage blockchain technology to make them more efficient. We enable prop firms to leverage perpetual futures on Hyperliquid, prediction markets, and spot assets. We are actively deploying our technologies to the largest prop firms in the world. The pace is intense, but the journey is exciting. We only hire A-players. You need to be exceptional.

Responsibilities

• Design and implement backend services across the trading domain.
• Own features end to end: schema, API, tests, UI integration.
• Contribute to real time infrastructure and client facing APIs.
• Write integration tests against real dependencies.

Requirements

• 5+ years production backend experience.
• Strong TypeScript or other strongly typed language background.
• Experience with trading systems, financial infrastructure, or exchange adjacent domains.
• Distributed system and transaction knowledge.
• Modern Node.js backend framework (NestJS preferred; Spring / FastAPI / similar acceptable).
• SQL and a production ORM (preferably TypeORM).
• Arbitrary precision decimal arithmetic in financial contexts.
• Integration first testing discipline.
• Able to ship React / Next.js features to completion.

Bonus

• Event sourcing experience.
• Crypto exchange experience.
• Direct experience with major exchange APIs (REST + WebSocket).
• AWS (ECS, Aurora, ElastiCache etc.), Terraform.
• Monorepo tooling (Turborepo, Nx).
• KYC / compliance workflows.
• Crypto native.