Staff JavaScript Engineer, Web SDK — Remote-First

Oscilar; Polska; Hybrid; PLN 544,000 - 816,000; Full time

Benefits offered by this job

401k

Remote-first culture

Health insurance

Unlimited PTO

Equity

Professional development

Job summary

Oscilar is hiring a Staff JavaScript Developer to design, build, and optimize our Web SDK for device fingerprinting, authentication, and risk analytics. You will lead cross-team efforts to deliver a secure, scalable SDK focused on fraud detection and privacy.

You will work on JavaScript/TypeScript, build robust CI/CD pipelines, and mentor engineers while shaping next-gen risk solutions for banks and fintechs in a remote-first environment.

Qualifications

• Bachelor's degree in Computer Science or related field.
• 8+ years of web development experience; 3+ years building SDKs.
• Proven track record contributing to open-source projects or GitHub.

Responsibilities

• Lead design and development of a high-performance Web SDK for browser/device data.
• Design algorithms for device fingerprints and behavior insights.
• Build and maintain CI/CD with cross-browser testing and release cycles.
• Optimize SDK performance to minimize resource use and ensure a seamless UX.
• Mentor junior engineers and conduct thorough code reviews.
• Collaborate with product, design, and QA to meet high-quality standards.

Skills

JavaScript

TypeScript

REST APIs

Git

Web SDKs

Security

Cross-browser

Build tools

Education

Bachelor's degree in CS

Tools

Webpack

Babel

Rollup

CI/CD

Job description

Oscilar is hiring a Staff JavaScript Developer to design, build, and optimize our Web SDK for device fingerprinting, authentication, and risk analytics. You will lead cross-team efforts to deliver a secure, scalable SDK focused on fraud detection and privacy.

You will work on JavaScript/TypeScript, build robust CI/CD pipelines, and mentor engineers while shaping next-gen risk solutions for banks and fintechs in a remote-first environment.