Kristopher Baker

Lead engineer for membership growth in a large-scale consumer application, owning features end-to-end from proposal through delivery and post-launch analysis.

• Led implementation of subscription funnel improvements, contributing to +29.8% incremental membership sign-ups through experimentation and iteration.
• Identified and addressed key friction points in checkout, implementing optimizations that contributed to +27,000 incremental subscribers annually.
• Served as frontend DRI for major product launches including Cart Entry Point, Express Sign-Up, and Long Distance Delivery, coordinating across iOS, Android, Web, backend, and data teams distributed across Germany, Finland, and Japan.
• Designed telemetry instrumentation and backend-driven UI systems enabling faster experimentation cycles and improved release confidence across the membership surface.
• Refactored shared UI components and standardized ViewModel patterns across checkout and discovery flows, reducing duplication and improving long-term maintainability.
• Authored technical design documents (RFCs) for cross-team architecture decisions and feature proposals.

Core iOS engineer on a consumer news application serving tens of millions of users globally, owning features across the full development lifecycle.

• Built and shipped features across feed rendering, onboarding, push notifications, navigation, and article display in a large-scale, performance-sensitive codebase.
• Owned feature delivery end-to-end: architecture design, implementation, testing, release planning, and post-launch iteration with metric-driven evaluation.
• Led Objective-C to Swift migration initiatives and established SwiftLint and SwiftFormat standards, improving code consistency and long-term maintainability across the iOS team.
• Implemented server-driven onboarding flows using SwiftUI, decoupling product iteration from release cycles and enabling rapid A/B testing of onboarding variants.
• Collaborated with product, backend, and ML teams across Tokyo and San Francisco to ship globally distributed features on tight timelines.
• Conducted 100+ technical interviews across engineering roles.

Developed native iOS applications across fitness tracking, social feed, and e-commerce products serving a large consumer user base.

• Diagnosed and resolved critical feed rendering bottlenecks using Instruments profiling and multithreaded layout computation, achieving consistent 60fps scrolling performance.
• Led early adoption of Swift and guided production applications through multiple major Swift language migrations, establishing patterns adopted across the team.
• Implemented CI/CD pipelines and release automation, improving development velocity and deployment reliability.
• Awarded Company MVP for delivering critical feed functionality during a team transition while maintaining release commitments.

Personal project · in progress

• Provider-agnostic LLM orchestration layer (Anthropic, OpenAI, OpenRouter, Ollama)
• Actor-based interview orchestration managing multi-phase conversation flow
• Real-time speech pipeline with on-device transcription (Parakeet) and low-latency TTS (Kokoro)
• RAG using vector embeddings + SQLite-backed storage to incorporate session history
• Structured evaluation engine with competency scoring and longitudinal tracking

Personal · open source · 2026

• Pause-point pipeline (Parse / Normalize / Validate / Repair / Generate / Render) with deterministic stages and LLM stages clearly separated
• External agent mode — LLM stages can hand off to an external agent that supplies the response and re-ingests
• Native PDF rendering via CoreGraphics with Hiragino Sans for proper Japanese typography