# Sr./Staff JavaScript Developer - Web SDK

**Company:** [Oscilar](https://hotfix.jobs/companies/oscilar)
**Location:** Remote
**Role:** Frontend Engineering
**Experience:** 8+ years
**Skills:** JavaScript, TypeScript, REST APIs, Git, webpack, Babel, Rollup, Browser Apis, CI/CD, Data Privacy, Encryption, Hashing, Obfuscation
**Posted:** 2025-10-27

> Leads design, development, and optimization of Web SDK for device fingerprinting, behavior analytics, and fraud detection using JavaScript and TypeScript. Requires 8+ years web development experience with 3+ years in SDKs, deep browser expertise, and security knowledge.

## Job Description

## Responsibilities
- Lead the development and maintenance of a high-performance Web SDK for collecting and analyzing browser and device-related data.
- Design and implement algorithms to create unique device fingerprints and capture behavior-based insights (e.g., gestures, keyboard, and mouse interactions).
- Build and maintain a robust CI/CD pipeline with automated cross-browser testing and release cycles.
- Continuously optimize SDK performance to minimize resource usage and ensure a seamless user experience.
- Stay updated on emerging web technologies, security practices, and industry trends to enhance SDK capabilities.
- Develop clean, maintainable, and well-documented code aligned with the best coding practices.
- Conduct thorough code reviews and mentor junior engineers on best practices.
- Collaborate with cross-functional teams—including product managers, designers, and QA engineers—to meet high-quality standards and customer requirements.
- Ensure data privacy and security principles are embedded in the SDK’s design and implementation.
- Drive innovation in browser-based solutions for risk, fraud detection, and device analytics.

## Technical Skills
**Proficiency:** JavaScript (ES6+), TypeScript, REST APIs, Git, and version control tools.
**Web SDK Expertise:** Extensive experience designing and maintaining Web SDKs or libraries with a focus on data collection, tracking, or analytics.
**Browser APIs:** Deep understanding of browser environments, APIs, and efficient handling of browser-related data.
**Security Principles:** Strong knowledge of data privacy, encryption, hashing, and obfuscation techniques.
**Cross-browser Compatibility:** Experience in building solutions that work seamlessly across various browsers and devices.
**Server-side Familiarity:** Understanding of server-side technologies and RESTful APIs for data retrieval and storage.
**Build Tools:** Proficiency in modern build tools and frameworks like Webpack, Babel, or Rollup.

## Soft Skills
- Excellent problem-solving abilities, with attention to detail and a focus on delivering high-quality solutions.
- Strong communication and collaboration skills to work effectively in cross-functional teams.
- Ability to mentor and provide constructive feedback to junior developers.

## Education & Experience
- Bachelor’s degree in computer science, Software Engineering, or a related field (or equivalent experience).
- 8+ years of experience in web development, with at least 3 years focused on building and maintaining SDKs.
- Proven track record of contributing to open-source projects or showcasing relevant work on platforms like GitHub.

## Preferred Qualifications
- Experience with AI-driven analytics, risk systems, or fraud prevention technologies.
- Familiarity with JavaScript SDKs, gestures, and interaction data processing.
- Prior experience in a high-scale, distributed environment.

## Benefits
- Competitive salary and equity packages, including a 401k.
- Remote-first culture — work from anywhere.
- 100% Employer covered comprehensive health, dental, and vision insurance with a top tier plan for you and your dependents (US).
- Unlimited PTO policy.
- Family-Friendly environment; Regular team events and offsites.
- Unparalleled learning and professional development opportunities.

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**Canonical:** https://hotfix.jobs/jobs/76cb5f53-3c9b-433b-a760-8d463cd86c7d