Question 1

Who is Marcin Walendowski?

Accepted Answer

Principal AI Native Product Engineer | ProductMaxxing | async culture, spec driven, high agency. Hand me a product and I'll own it end to end, from discovery and spec to architecture, build, and launch. I take responsibility, move proactively, and ship. I bring startup DNA: high agency, full ownership, and an async culture.

Question 2

What is he working on now?

Accepted Answer

Founder at Loki Messages, Beside & Predicts (May 2026 – Present). Three products built end-to-end and solo, the AI-native way — a messaging platform for agents plus two consumer apps on top of it (a live-location assistant and an onchain prediction-markets trading agent). One person from native macOS systems to the edge runtime to shipped, localized apps and a self-custody trading wallet: the generalist, full-ownership story.

Question 3

What technologies does he work with?

Accepted Answer

AI / LLM: AI-native product building (intelligence as the product), agents & agent loops, LLM orchestration, MCP (Model Context Protocol), ChatGPT / MCP Apps, tool calling, context & loop engineering, evaluation & observability (LLM-as-judge, deterministic assertions), non-deterministic/probabilistic quality, provider-agnostic model routing / failover, guardrails & human-in-the-loop, multi-provider AI fluency, RAG/pgvector, Anthropic & OpenAI APIs.. Mobile / Web / Desktop: React Native / Expo (core), native iOS (Swift/Obj-C) & Android (Kotlin), enterprise iOS App Clips, Capacitor, React / Next.js, Electron desktop apps, browser extensions, WebView / WKWebView automation, Apple Pay, EAS / TestFlight, deep linking, OTA; multi-platform SDK authoring (Swift/Kotlin/Expo/TS), TypeScript, JavaScript, Python, SQL, PHP.. MarTech / Data / Fintech: CDPs, Segment, Braze, Salesforce, Brevo, Snowflake, Starburst, Apache Airflow, Retool (internal tools), Branch.io / Google Tag Manager (attribution), product & issue analytics, SKAdNetwork/ATT, Adjust, Mixpanel, Plaid, Yodlee, Robinhood, Coinbase, Stripe, Apple Pay, onchain agents (Solana, Polymarket CLOB, Privy self-custody wallets, Polygon/USDC, gasless settlement).. Backend / Cloud: Node.js, Hono, NestJS, tRPC, GraphQL, Postgres/Drizzle, Redis, WebSockets, Cloudflare Workers / Durable Objects / D1 / R2, GCP (Cloud Run, Memorystore) & AWS (ECS/ECR), Terraform, GitHub Actions CI/CD. Leadershipfounding engineer, team lead (up to ~20), hiring (100+ interviews), CTO, technical sales, stakeholder workshops..

Question 4

What has he built?

Accepted Answer

Loki Messages (https://lokimessages.com): iMessage as a REST API and MCP server for agents. Beside (https://beside.chat): Live-location consumer agent that lives as a contact in Messages. Predicts (https://predicts.chat): Onchain prediction-markets agent trading Polymarket by text or voice.

Question 5

How do I contact him?

Accepted Answer

Email kontakt@marcinwalendowski.pl or book a 30-minute call at https://calendly.com/marcin-walendowski/30min.