{ "$schema": "https://raw.githubusercontent.com/jsonresume/resume-schema/v1.0.0/schema.json", "basics": { "name": "Marcin Walendowski", "label": "Principal AI Native Product Engineer | ProductMaxxing | async culture, spec driven, high agency", "email": "kontakt@marcinwalendowski.pl", "url": "https://marcinwalendowski.pl", "summary": "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.", "location": { "city": "Warsaw", "countryCode": "PL" }, "profiles": [ { "network": "LinkedIn", "url": "https://www.linkedin.com/in/marcinwalendowski/" }, { "network": "GitHub", "url": "https://github.com/MarcinWalendowski" } ] }, "work": [ { "name": "Loki Messages, Beside & Predicts", "position": "Founder", "location": "Warsaw, Poland (Remote)", "period": "May 2026 – Present", "summary": "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.", "highlights": [ "Loki Messages — iMessage as a REST API and MCP (messaging infrastructure for agents)", "Beside Chat — live-location consumer agent (the actor)", "Predicts — onchain prediction-markets trading agent (predicts.chat)", "Whole agent architecture (one runtime, many actors)", "Turned iMessage into a REST API and MCP server: a fleet of Mac agents exposes send/receive, reactions, typing, read receipts, native polls and live location as 30+ endpoints with sub-second webhooks, over real US/EU numbers and no third-party SMS gateways.", "Native systems programming behind a clean cloud API: AppleScript automation plus a private IMCore dylib injected into Messages (DYLD_INSERT_LIBRARIES) and a FindMy bridge for live location.", "Provisioned the Mac-agent fleet as code with Ansible — playbooks create each macOS user, install the agent, and bring its Cloudflare Tunnel + remote-VNC access online; a companion session-keeper service holds VNC sessions alive across the fleet.", "Shipped Beside Chat, a location-aware agent that lives as a contact in Messages and texts you the moment you're near something you care about; no app, no account, onboarding is one text. Sends native Messages carousels, remembers preferences, schedules its own reminders. 0 → live, localized into 50+ languages.", "Shipped Predicts, an onchain prediction-markets agent that trades Polymarket by text or voice: grounded live odds, a live trending board, generated market cards, and Auto Trade that turns a plain-language rule (\"buy YES under 30%\") into placed orders. Real markets executed through Polymarket's CLOB (@polymarket/client), settling gaslessly on Polygon in USDC.", "Self-custody trust layer: each user gets an embedded Privy MPC wallet (non-custodial — Predicts never holds the key); the agent gets only a delegated signing grant policy-locked to Polymarket's contracts, inside per-trade and daily caps, revocable in one tap. Built the onchain infra: a fiat + crypto onramp, a PII-free wallet-link web app, and a self-hosted order relay (Cloudflare Tunnel + Access) for Polymarket's geo-blocked endpoint.", "In-chat feedback loop (loop engineering): users flag issues in plain language mid-conversation; an LLM-inferred report-issue tool captures them with no keyword or command and routes each into a triage queue. An autonomous agent loop turns well-scoped reports into spec'd tasks and carries them spec → implementation → deploy with no human in the middle, often shipping the fix to production in minutes.", "Custom agent loop on Cloudflare Durable Objects — stateful per-conversation agents, MCP tool calling, model failover, proactive scheduled tasks. A transport-agnostic delivery layer lets one runtime speak any channel: started on iMessage, the same agent now plays multiple branded personas across iMessage, WhatsApp and Telegram (Beside and Predicts are two of them). Built with fleets of coding agents." ], "url": "https://lokimessages.com" }, { "name": "Passage", "position": "AI-Native Founding Engineer", "location": "New York (Remote)", "period": "Dec 2024 – May 2026", "summary": "Seed-stage fintech founded by ex-Plaid engineers; backed by Plaid's CEO, Max Altman, Mischief & Saga. Owned three products end-to-end, the AI-native way — spec-driven, with custom agent skills and custom MCP observability/loop connectors.", "highlights": [ "Passage Money — agentic personal finance inside ChatGPT & Claude", "Passage Connect — App-Clip + browser-automation account linking", "Gravy — gamified cash-back consumer app", "Shipped one of the first personal-finance agents to live entirely inside ChatGPT & Claude — 27+ MCP tools (Zod-typed, visibility-scoped) and an agent-inside-a-tool-call running its own nested inference loop. Built on the OpenAI Apps SDK weeks after launch, then ported the widgets to the MCP Apps spec for cross-host support.", "Made a non-deterministic AI product testable: a 3-layer eval harness (deterministic assertions + LLM-as-judge + lifecycle-stage seeding) in a CI benchmark pipeline, plus self-tracing observability (MCP tools that let the agent query its own logs).", "Context & memory engineering — persistent agent memory/session state on Durable Objects, RAG (pgvector + OpenAI embeddings), document/file-search tool retrieval that scaled tool selection across 1,000+ data providers (each provider's MCP tools indexed and retrieved per query instead of loaded into context), Cloudflare Code Mode for large tool catalogs (tools exposed as a typed TypeScript API the agent writes code against and runs in a sandbox, instead of loading every tool schema into context), context-window management, function calling & structured outputs for reliable, schema-constrained agent behavior, active-state prompt injection, tool-result truncation, per-agent model failover with fallback provider/timeout, and human-in-the-loop payment flows.", "Built a Plaid-style account-linking platform where credentials never leave the device: a Cloudflare Durable Objects session engine (<50ms edge relay), client-driven WKWebView automation, and multi-tenant OAuth 2.0 (ES256 JWT, PKCE) that replaced Cloudflare Access.", "Cracked account-linking on sites that actively resist automation — Walmart, Starbucks, Marriott, Google Maps, AT&T, Verizon — with per-page agentic loops that adapt to each page, delivered through an embedded / injected WebView inside an iOS App Clip and exposed across the multi-language SDK suite, validated against world-class antibot stacks (Cloudflare Turnstile, Google reCAPTCHA).", "Owned the client SDK suite solo — Swift, Kotlin, Expo & TypeScript (plus Capacitor and web) — and shipped iOS App Clips for enterprise customers.", "Consolidated the platform onto Cloudflare (NestJS + Socket.io + GCP → Next.js + Durable Objects): cut the core auth flow 2,500 → 180 lines, dashboard polling ~98%, and infrastructure cost & operational overhead ~in half.", "Shipped Gravy, a gamified cash-back React Native app, zero → App Store (Apple Pay, Coinbase integration for crypto payouts, WebView checkout, event-triggered rewards, IP-based geofencing for regulatory compliance)." ] }, { "name": "Checkatrade", "position": "Staff Software Engineer", "location": "London (Remote)", "period": "Sep 2023 – Dec 2024", "summary": "Contract · UK's #1 home-services marketplace.", "highlights": [ "MarTech platform engineering — scaled comms service architecture to 100,000+ RPS; drove cross-team CI/CD, release engineering, and observability improvements.", "Migrated 5M+ customer profiles from Salesforce into Segment & Braze — stood up the event-collection and activation layer that unified customer data across the marketing stack.", "Orchestrated lifecycle comms across multiple providers (incl. a migration to Brevo) and kept attribution accurate across Branch.io, Google Tag Manager, and the wider marketing stack.", "Built internal tools in Retool plus product & issue analytics on Snowflake and Starburst data, giving marketing and product teams self-serve insight." ] }, { "name": "Astor", "position": "Head of Engineering", "location": "New York (Remote)", "period": "Sep 2022 – Sep 2023", "summary": "Community-driven personal-finance app (astor.money, backed by NFX & TMV) — aggregates bank & brokerage accounts into a single wealth view, paired with community investing.", "highlights": [ "Built and led a top-tier team of 5 engineers; owned the engineering architecture across iOS, Android, backend & platform.", "Built financial-data integrations across Yodlee, Plaid, Robinhood — bank / brokerage / transaction sync with OAuth flows." ] }, { "name": "No Big Deal SA", "position": "Founding Product Engineer", "location": "Luxembourg (Remote)", "period": "Sep 2021 – Sep 2022", "summary": "Mobile engagement-marketing + wellbeing/fitness app (iOS + Android).", "highlights": [ "Led mobile development end-to-end; designed CI/CD for mobile tests/builds/deploys with Ansible + M1 Azure pipelines and Detox e2e tests.", "Integrated native HealthKit and Google Fit with background processing.", "Designed and led backend development of a Fitness service API integrating Fitbit, Strava, Garmin, Polar." ] }, { "name": "Taxfix", "position": "Staff Software Engineer (Frontend Platform & MarTech)", "location": "Berlin (Remote)", "period": "Mar 2021 – Sep 2021", "summary": "Contract · Germany's most popular mobile tax app.", "highlights": [ "Implemented iOS 14.5 ATT / SKAdNetwork attribution across a brownfield React Native app.", "Re-engineered mobile CI/CD — Bitrise → M1 bare-metal GitLab runners (−80% execution time, ~$20k/mo savings); created and maintained the Terraform that provisioned the bare-metal M1 Macs on MacStadium (third-party provider) with the full CI/CD toolchain, plus Ansible config; Detox e2e + CodePush.", "Built a GTM automation tool on GitLab pipelines and advanced Segment + Braze integrations (mobile + web), with Snowflake on the data side." ] }, { "name": "Flip Fit (Humans, Inc.)", "position": "Founding Senior Engineer", "location": "Los Angeles (Remote)", "period": "Apr 2019 – Mar 2021", "summary": "Social-commerce app (social media + live shopping). Flip (Humans, Inc.) went on to raise $144M at a $1B+ valuation (~7.8M downloads).", "highlights": [ "Prepared the mobile architecture and organization to scale: grew to two mobile engineering teams (~20 engineers), ran 100+ interviews, and owned the cross-platform iOS and Android architecture behind an app that reached #7 among US ecommerce apps.", "Shipped the app cross-platform for iOS and Android on React Native, authoring complex native modules on both platforms (Objective-C/Swift on iOS, Kotlin on Android): LL-HLS & HLS video player, RTMP live streaming (HaishinKit) with deep Akamai Video & Cloudflare Stream integration, reverse-proxy HLS segment caching (GCDWebServer), advanced push (Push Stories, action buttons, in-app messaging), deferred deep links, PINCache prefetch/caching.", "Designed mobile architecture for performance & stability with advanced JS + native profiling; Segment/Mixpanel/Braze analytics; Sentry, CodePush, Reanimated." ] }, { "name": "TeaCode.io", "position": "Co-Founder & CTO", "location": "Warsaw / Oslo / London (Remote)", "period": "Mar 2016 – Mar 2019", "summary": "Boutique Node.js / React / React Native consultancy.", "highlights": [ "Led and grew a team of 20 engineers; owned architecture, hiring, technical sales, and on-site business/technical workshops in Norway, Italy, and the UK. Shipped 10+ products across those clients; highlights below.", "Touchcom (Oslo) — designed and led a micro-serviced building access-control system: API, admin panel, mobile apps, an Electron app on an IoT device, plus logging and custom monitoring.", "Autopilot (US) — highly scalable marketing-automation integrations (Mailchimp, Segment, Mixpanel, Intercom)." ] }, { "name": "MU Interactive Media", "position": "Full-Stack / Front-End Developer", "location": "Warsaw", "period": "Mar 2013 – Mar 2016", "summary": "", "highlights": [ "Built a custom JS presentation player for a PepsiCo conference with Logitech R400 presenter integration.", "Built a marketing & mailing-automation system for IBM Poland, a no-code visual website builder, and a JS video player for VOD & live-streaming.", "Full-stack across JS/HTML5/CSS3/Sass/jQuery/WordPress and PHP/Node.js/MySQL/MongoDB; managed LAMP/LNMP stacks." ] } ], "skills": [ { "name": "AI / LLM", "keywords": [ "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." ] }, { "name": "Mobile / Web / Desktop", "keywords": [ "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." ] }, { "name": "MarTech / Data / Fintech", "keywords": [ "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)." ] }, { "name": "Backend / Cloud", "keywords": [ "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." ] } ], "projects": [ { "name": "Loki Messages", "description": "iMessage as a REST API and MCP server for agents.", "url": "https://lokimessages.com" }, { "name": "Beside", "description": "Live-location consumer agent that lives as a contact in Messages.", "url": "https://beside.chat" }, { "name": "Predicts", "description": "Onchain prediction-markets agent trading Polymarket by text or voice.", "url": "https://predicts.chat" } ], "education": [ "Warsaw University of Technology — Engineer's degree, Electronics & Information Technology · 2011–2015 | exchange at Universidad de Las Palmas de Gran Canaria · 2013–2014 (research: h.264 vs h.265)" ] }