[Hiring] Performance & Rendering Engineer @Kaleidos

Role Description

At Penpot we build the design tool that brings together people who design and people who code, within a free, collaborative software environment. We're constantly adding new features that the community and our users ask for, and our challenge is to make all of them as stable and efficient as possible.

• You'll be part of a small team working in Rust on Penpot's rendering engine (built with WASM, Rust, and Skia), on the text editor, and on ongoing performance improvements.
• Your work will be focused on fixing bugs, improving performance, and building new features for that engine.
• Performance is the main focus: help us make Penpot run smoothly in the browser, with response times as fast as possible.
• You'll also have some points of contact with the frontend, mainly when it comes to passing data between Clojure and the engine.
• We’re looking for someone with senior, solid, consolidated experience, to work within a horizontal team with no manager figure: autonomy and shared decision-making are part of the role.

Qualifications

• Rendering engines experience (WASM, Rust, Skia).
• Hands-on experience with frontend technologies, with a good command of JavaScript, browser APIs, HTML, and CSS.
• Regular use of LLMs (Claude, Cursor, ChatGPT, OpenCode...) as part of your way of working.
• Comfortable working in Linux environments.
• High level of spoken and written English and Spanish.

Requirements

• Experience in graphics engines or in-browser game development (using graphics APIs).
• Interest in working in graphics environments.

Earn extra points

• Familiarity with Clojure or other functional languages (Scheme, Lisp...).
• Knowledge of JavaScript testing (Jest, Cypress...) and end-to-end tests with Playwright.
• Interest in solving user problems with new languages and frameworks.
• Interest/knowledge in accessibility and responsible development.
• Interest/knowledge in design systems and their integration with product development.
• Previous experience or genuine interest in open-source projects.
• Use of agile methodologies in a professional environment.
• Background of collaboration in diverse teams (design, marketing, backend...).
• Ability to ask the right questions to help product development.
• Care for testing your own code responsibly (unit, integration, and end-to-end tests).

What do we offer?

• Salary: €60–67k (gross annual salary).
• Permanent contract.
• Flexible schedule.
• 37.5h/week as part of our plan to create a better work-life balance.
• 100% remote position.
• 23 days of paid vacation, plus December 24 and 31, and the option to request 10 extra days of unpaid leave.
• Choose the holiday calendar of where you live or of our headquarters (Madrid).
• Continuous learning through internal and external training, conferences, and events.
• Company-paid language classes (English and Spanish).
• 2 PIWEEKs a year!
• Level up your workspace.
• An environment where your opinion matters.
• An open source company.
• Self-organized teams.
• Alan health insurance through flexible compensation (coverage only in Spain).

What is the process like?

• First interview (25 min) with the People team.
• You send us your cover letter, which we review together with your CV with the selection committee.
• Cultural interview, with two colleagues from different departments.
• Technical interview.
• Conversation with Pablo.