Sr./Staff JavaScript Developer - Web SDK (Brazil/Canada/UK/Poland/India)
Oscilar, an AI risk-decisioning platform for fraud, credit, and compliance, is hiring a Staff JavaScript Developer to build its Web SDK for device fingerprinting, identity verification, and behavior analytics. Daily work centers on JavaScript/TypeScript SDK development, deep browser APIs, performance optimization, and CI/CD — not UI/app development.
- Compensation
- R$393.8K–R$574.3K / yr
- Location
- Brazil
- Work setup
- Remote
- Seniority
- Staff
- Employment
- Not specified
- Experience
- 3+ years
- Category
- Software engineering
- Posted
Skills
Must have
- Proficiency in JavaScript (ES6+), TypeScript, REST APIs, Git, and version control tools
- Extensive experience designing and maintaining Web SDKs or libraries for data collection, tracking, or analytics
- Deep understanding of browser environments, APIs, and handling browser-related data
- Strong knowledge of data privacy, encryption, hashing, and obfuscation techniques
- Experience building cross-browser compatible solutions
- Understanding of server-side technologies and RESTful APIs
- Proficiency in modern build tools like Webpack, Babel, or Rollup
- Excellent problem-solving abilities with attention to detail
- Strong communication and collaboration skills for cross-functional teams
- Ability to mentor and provide constructive feedback to junior developers
- Bachelor's degree in Computer Science, Software Engineering, or related field (or equivalent experience)
- 8+ years of web development experience, with at least 3 years focused on building and maintaining SDKs
- Track record of contributing to open-source projects or relevant work on GitHub
Nice to have
- 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
Full description
**Shape the future of trust in the age of AI
**At Oscilar, we're building the most advanced AI Risk Decisioning™ Platform. Banks, fintechs, and digitally native organizations rely on us to manage their fraud, credit, and compliance risk with the power of AI. If you're passionate about solving complex problems and making the internet safer for everyone, this is your place.
Why join us:
- Mission-driven teams: Work alongside industry veterans from Meta, Uber, Citi, and Confluent, all united by a shared goal to make the digital world safer.
- Ownership and impact: We believe in extreme ownership. You'll be empowered to take responsibility, move fast, and make decisions that drive our mission forward.
- Innovate at the cutting edge: Your work will shape how modern finance detects fraud and manages risk.
Job Description
We are seeking a highly skilled Staff JavaScript Developer to design, build, and optimize our Web SDK. This SDK will be at the core of our solutions for device fingerprinting, identity verification, and behavior analytics, enabling our customers to stay ahead in the ever-evolving fraud prevention landscape. This is not a UI or App development role, this is building SDKs for detecting fraud by analyzing device and behavioral properties. This requires deep understanding of the platform internals.
As a Staff Developer, you will lead the design, development, and performance optimization of our Web SDK, leveraging your deep expertise in JavaScript, TypeScript, and modern web technologies. You will collaborate across teams to deliver a secure, scalable, and developer-friendly SDK.
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.