Readdle is a pioneering force in the personal productivity space on Apple devices, having shaped the landscape since 2007. Our mission is to empower individuals and teams with innovative technology, enhancing their efficiency and creativity. We are dedicated to crafting exceptional mobile and desktop experiences for those who aspire to achieve more.
As a Senior AI Prototyping Engineer, you will work at the intersection of AI research, product engineering, and rapid experimentation. Your mission is to turn new AI capabilities into real, testable product experiences and help bring the best of them into production at Spark. You will collaborate closely with Product, Design, and our AI R&D team to explore ideas, build prototypes, evaluate them quickly, and help ship AI features to a global audience.
What you’ll do
- Prototype new AI-powered features based on emerging AI capabilities
- Translate early ideas into end-to-end working prototypes
- Design and maintain evaluation pipelines (quality, latency, cost, reliability)
- Compare models, prompts, and approaches using metrics and structured evaluation
- Work closely with R&D to turn research insights into product-ready concepts
- Collaborate with product engineers to support production integration
- Iterate quickly based on evaluation results and product feedback
- Track relevant AI advancements and assess their applicability to Spark
About you:
- 5+ years of experience building software products or prototypes
- Hands-on experience working with LLMs and modern AI APIs
- Strong prototyping skills in at least one of: Swift, Java, Kotlin, TypeScript, Go or Python
- Experience building or using evaluation frameworks for AI systems
- Ability to compare solutions using metrics and data
- Product-oriented mindset with focus on real user value
- Strong communication skills across engineering, R&D, and product teams
- Comfort working on early-stage problems and defining solutions
Would be a plus:
- Experience with on-device ML (Core ML, LiteRT Next, ONNX)
- Familiarity with mobile or desktop product architectures (iOS, Android, Electron)
- Experience with supervised fine-tuning or tuning provider-hosted models
- Experience collaborating closely with designers or building demo UIs
- Prior work on AI features used by large user bases
What you will get at Readdle:
- Customer-centric culture. We put our users at the heart of everything we do. Every team member has the opportunity to engage directly with customers, gaining insights that shape meaningful, delightful experiences for millions worldwide.
- Relentless growth. We’re committed to mastery in our craft. We take ownership of our work, decisions, and outcomes, and we see feedback as a catalyst for growth. Every challenge is an opportunity to learn, evolve, and raise the bar.
- Exceptional people, exceptional team. Our greatest strength is our people. We care deeply about each other, work transparently, and celebrate collective success. Together, we build an environment where everyone can do their best work and grow beyond their potential.
- Real impact. We design products that truly matter. Our focus is on delivering tangible value, simplifying complexity, pushing boundaries, and continuously improving how we build and deliver solutions to our users.
- Culture of innovation. We embrace curiosity and creativity in everything we do. Fresh ideas are not just welcomed, they’re expected, celebrated, and turned into real innovations that shape the future of our products and company.
