Steven Obst
AI Solutions Architect | Full-Stack Systems | Automation | SaaS
About
I design and ship production systems end-to-end, using AI as a force multiplier.
My background is ecommerce and fintech project management. Years of sitting between developers and stakeholders taught me to scope systems, write specs that survive implementation, and spot problems before they reach production.
I handle system architecture, technical direction, and validation. AI handles implementation speed. Fast iteration without cutting corners on reliability. That's the tradeoff I've figured out how to make work.
What I care about is what AI can do for businesses beyond chatbots. Intelligent pipelines that replace manual workflows. Decision support that actually changes how a company operates day to day. I spend most of my time figuring out where those opportunities are and then building them.
Multiple production systems live and counting. SaaS with Stripe billing, a DeFi solver in Rust competing in live blockchain auctions, a 29-source data aggregator, trading bots, a Solidity security scanner. All live, all solo.
Based in Berlin. German and English.
Technical Skills
Core Stack
Python, JavaScript, TypeScript, Bash
Windows, Linux, macOS, Docker, VMs, Git
Frontend
Next.js 15 App Router, server/client components, middleware, SSR, React 19 Hooks, context, custom hooks, optimistic UI, real-time polling, TypeScript Strict typing, shared interfaces, type-safe API layer, Tailwind CSS v4 Utility-first, custom themes, responsive design, dark mode, Framer Motion, HTML/CSS
Backend
Python / Flask App factory, Blueprints, background workers, APScheduler, JWT auth, FastAPI Async endpoints, Pydantic validation, used in security and tax tooling, Rust / Axum Async HTTP server, Tokio runtime, used in DeFi solver, Supabase PostgreSQL RPC functions, Row-Level Security, migrations, real-time subscriptions, Stripe Integration Subscription billing, webhooks, credit-based usage accounting
AI / LLM Engineering
Multi-Model Orchestration Claude, Gemini, DeepSeek: routing by cost/capability per task, Evaluation Pipelines 5-tier funnel: SQL filter, Jaccard overlap, batch scoring, re-ranking, Content Generation 3-call cover letter pipeline: Analyst, Writer, Proofreader with PII safety, Prompt Engineering, JSON Schema Validation
E-Commerce
Shopify Store setup, theme customization, product management, integrations, WooCommerce, eBay, Amazon, Otto, Kaufland
Multichannel Feeds, Product Management, SEO Automation
Data & Infrastructure
Data Aggregation Multiple source types (APIs, ATS feeds, scrapers), 3-layer deduplication, circuit breakers, Supabase Auth JWKS verification, OAuth (Google/LinkedIn), PKCE flow, RLS policies, Docker, CRON, GitHub, Linux
Automation n8n, Zapier, REST APIs, webhook orchestration, n8n, Zapier, Webhook Pipelines
DeFi / Blockchain
DEX Integration Uniswap V2/V3, Curve, Balancer, Camelot, Trader Joe — pool math and calldata encoding, CoW Protocol Batch auction solver, GPv2Settlement encoding, UDCP/EBBO compliance, Smart Contract Security Slither static analysis + AI review, 10 vulnerability classes, multi-chain Etherscan
Polymarket EIP-712 signing, CLOB SDK, prediction market probability estimation, On-Chain Data WebSocket event feeds, The Graph subgraphs, pool indexing, multicall batching, Ethereum, Arbitrum, Solana
Project Highlights
SwiftJob: Career Intelligence Platform
Three repos, one product. A standalone aggregator scrapes 29 job sources across hundreds of companies, a Flask backend scores them through a 5-tier AI funnel, and a Next.js dashboard lets users generate cover letters, do mock interviews, run career analytics, and more.
Stripe billing with a credit system, bilingual (EN/DE). The aggregator runs on its own CRON cycle with circuit breakers per source. Deployed on Railway.
CoW Protocol Solver
Rust solver that competes in CoW Protocol batch auctions on Arbitrum. Every 8 seconds it receives a batch of trade orders and figures out the best way to route them through 1,400 liquidity pools across 7 DEXs.
Solves in 5 phases: direct pool routing, multi-hop via intermediaries, split across multiple pools, graph-based pathfinding, then falls back to external aggregators if needed.
Talon: Field Sales Execution System
Client project. A PWA that replaces the Excel sheets field reps use to track 14-day promotion campaigns across German retail chains. The reps are 50-60+, so the UX had to be dead simple and mobile-first.
Multi-tenant with Supabase RLS, 4 different quantity input modes depending on product type, real product catalog with templates, follow-up tracking, and campaign dashboards.
Smart Contract Security Scanner
Runs slither static analysis on Solidity contracts, then has Claude do a deeper review looking for 10 vulnerability types (reentrancy, access control, integer overflow, unchecked calls, and more). If it can't produce a working exploit, it doesn't report it.
Pulls verified contracts from Etherscan across 8 chains, offers 3 scan depths, generates PDF reports. Stripe billing with free/pro/enterprise tiers.
Polymarket AI Scanner
Scans 500+ Polymarket prediction markets twice a day. For each one, GPT estimates the actual probability using live web search, then compares that to what the market thinks. If there's a gap, it paper-trades with Half-Kelly sizing.
Most of the cost savings come from tiered analysis: only high-signal markets get the expensive deep research. Everything else hits cache. 90%+ cache hit after the first day. Tracks Brier scores to measure if the predictions are actually calibrated. FastAPI dashboard on Railway.
DeFi Tax Calculator
Import your EVM wallets, Solana wallets, or CEX CSV exports and it figures out what happened: swaps, LP deposits, staking rewards, bridges, airdrops, NFTs. Then calculates your cost basis three ways (FIFO, LIFO, HIFO) so you can compare.
Generates IRS Form 8949 with the short/long-term split done for you. All the money math uses Decimal, not floats, because rounding errors in tax software is a bad time. Everything stays local in SQLite. Nothing leaves your machine.
Solana Trading Bot
Real-time Solana trading engine. Monitors memecoins, catches early entries, and tracks market activity across Pump.fun, Raydium, and Axiom.
Uses LLM-based filtering to sort signal from noise in Twitter and Telegram feeds. Has a dashboard for position tracking and risk management.
JL Shopping
Did the full digital setup for a small retailer. Shopify store, domain, branding, legal pages, product catalog.
Then the operational stuff: multichannel feeds to Otto, Kaufland, Amazon, eBay. SEO automation via n8n. Internal tooling like company email, cloud storage, inventory software, and a mobile barcode scanner for warehouse intake.
Prompt Compass
Chrome extension that adds structure to long ChatGPT conversations.
You can drop markers, tag highlights, and index threads so you can actually find things later instead of scrolling forever.
Detects when you switch conversations, persists everything in chrome.storage.local, and keeps state synced across tabs. Small and fast.
Reddit Trend Engine
n8n pipeline that watches specific subreddits via RSS, pulls posts, and runs them through GPT for tagging and clustering.
The output is a list of trends, recurring pain points, and product ideas people are actually talking about. Used it for SaaS research and keyword discovery.
GPT Prompt Pack Factory
Give it a niche or trend keyword and it generates a full prompt library. n8n chains the prompts, GPT writes and enriches them, and the output is a ZIP-ready pack.
Markdown or JSON, ready to sell on Gumroad, drop in a Telegram group, or just use internally. Basically a content factory with one input.
Experience Highlights
Independent AI Automation Projects
Designing and shipping AI-powered SaaS products, data aggregation systems, and workflow automation tooling. Building DeFi protocol infrastructure including a competitive batch auction solver. Delivering client projects in field sales automation. Developing smart contract security scanners, prediction market systems, and crypto tax tooling.
Technical Project Manager – Better Payment GmbH
Led developer coordination, feature scoping, and cross-team delivery for a FinTech SaaS platform.
Translated client needs into specs and GitHub issues, managed sprint cycles, and worked directly with stakeholders on product delivery.
E-Commerce Manager – Getränke Stöhr GmbH
Ran Amazon, eBay, and custom shop operations. Managed product listings, supplier workflows, returns, and pricing across platforms.
Systems & Architecture
Patterns, technologies, and workflows I design into production systems
Let's talk.
I design and ship full-stack systems with AI acceleration. Production-ready MVPs in weeks, complex workflow automation, API integrations that actually work. If you need something built and running, not just specced, reach out.