Steven Obst

Full-Stack Developer | Technical Project Manager | AI Automation | SaaS Systems

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About

Most technical problems are not purely technical and most business problems are not purely business. I work at the intersection of both.


I started in ecommerce and fintech project management, coordinating developers, translating stakeholder requirements, and delivering features in structured environments.
Over time, I moved from coordinating systems to building them directly.

Today I design and ship AI-powered SaaS systems end to end.

Combining product awareness, operational context, and hands-on technical execution to build tools that are practical, scalable, and aligned with real business needs.

I understand how software is scoped, delivered, and maintained inside teams. I also understand how it is built at the code and system level.

From data aggregation and automation pipelines to full-stack product development, I focus on clarity, modular design, and measurable outcomes.


Based in Berlin. German and English. Security-aware and comfortable operating across both business and technical domains.

Full-Stack Developer Technical Project Management AI Automation SaaS Systems Next.js Python PostgreSQL API Integration Workflow Automation Security-aware Berlin German / 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, Supabase PostgreSQL RPC functions, Row-Level Security, migrations, real-time subscriptions, REST API Design 65+ endpoints, auth middleware, validation, structured error handling, Playwright Stealth browser automation, ATS form filling, anti-detection, human simulation

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 20+ sources, 10 ATS parsers, 3-layer deduplication, circuit breakers, Supabase Auth JWKS verification, OAuth (Google/LinkedIn), PKCE flow, RLS policies, Docker, CRON, GitHub, Linux

Web Scraping Playwright stealth, proxy rotation, rate limiting, structured extraction, Regex, CSV Wrangling, Google Sheets

Automation n8n, Zapier, Tampermonkey, REST APIs, browser scripting, n8n, Zapier, Tampermonkey, Browser Scripting

Project Highlights

SwiftJob Dashboard

SwiftJob: AI Job Search Platform

A full-stack SaaS platform that aggregates, evaluates, and automates job applications using multi-model AI pipelines.

Built with a Next.js frontend, Python/Flask backend, and Supabase PostgreSQL. Pulls from multiple job sources with deduplication and structured evaluation. Uses cost-aware model routing across Claude, Gemini, and DeepSeek to score, rank, and auto-apply to matched positions.

Next.js React TypeScript Flask PostgreSQL Supabase Multi-Model AI Playwright
Prompt Compass

Prompt Compass

A browser extension for ChatGPT that brings structure to long-form conversations.
Prompt Compass adds marker-based navigation, taggable highlights, and persistent thread indexing, turning ChatGPT into a power tool for research and memory.

Built with session-aware logic, it detects conversation changes, stores data using chrome.storage.local, and syncs UI state across tabs. Lightweight, fast, and designed for flow.

JavaScript Chrome Extensions Prompt Engineering UI Design Persistent Storage
JL Shopping

JL Shopping

A full digital presence rollout. Built and launched the entire ecommerce and operations stack from scratch.

Set up their Shopify store, domain, and website; handled branding, legal pages, and product infrastructure.
Built multichannel feeds (Otto, Kaufland, Amazon, eBay), SEO enrichment, and n8n automation pipelines.
Deployed internal tooling: company email, cloud storage, inventory software, and a mobile EAN-based intake scanner to streamline operations.

Full-Stack Ecom Shopify n8n Multichannel Feeds System Setup Mobile Tools SEO Automation
Trend Engine

[redacted] Trend Engine

Built an automated Reddit + GPT pipeline to extract trends, pain points, and product ideas from live subreddit discussions.

Scraped targeted niche-lists of subs via RSS, parsed posts, and ran GPT tagging and clustering. Outputted monetizable insights and keywords for trend mapping and SaaS research.

n8n Reddit Scraping GPT Integration Trend Analysis Prompt Engineering Market Research
Solana Trading Bot

Solana Trading Bot

A a real-time trading engine to monitor memecoins, snipe early entries, and analyze Solana market activity.

Combined multi-API trade logic (Pump.fun, Raydium, Axiom) with LLM-based narrative filtering and Twitter/Telegram sentiment tracking.
Designed modular dashboard and risk logic to support high-frequency alpha group operations.

React Web3 Solana LLM Integration Trading Bots Alpha Tools
Prompt Pack Factory

GPT Prompt Pack Factory

Automated pipeline to generate, cluster, and package reusable GPT prompt libraries based on trend or niche input.

Powered by n8n + GPT, it chains prompts, enriches them, and outputs ZIP-ready packs in Markdown or JSON, ready for Gumroad, Telegram, or internal use.

n8n Prompt Engineering Micro-SaaS LLM Automation Productization Workflow Design

Experience Highlights

2024 – Present

Founder, Full Circle UG

AI Automation & SaaS Development.
Designed and built SwiftJob, a full-stack AI job search platform covering data aggregation, AI-powered evaluation with cost-aware model routing, automated applications, and a real-time Next.js frontend.
Solo-built across the full stack: database design, API layer, auth system, frontend, and infrastructure.

Oct 2021 – Dec 2024

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.

2017 – 2019

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

Modular DesignComposable systems with clear boundaries: plug-in sources, swappable AI models, isolated repos sharing one database Pipeline ArchitectureMulti-stage evaluation funnels with progressive filtering and cost-aware model routing REST API DesignFlask Blueprints with auth middleware, validation, structured error handling Database Schema DesignPostgreSQL with RPC functions, Row-Level Security, migration system Runtime ResilienceCircuit breakers, retry logic, concurrency control, health tracking, graceful degradation Signal FilteringMulti-layer noise reduction: dedup, hash matching, relevance scoring Multi-Model OrchestrationCost-aware routing across Claude, Gemini, DeepSeek: different models for different tasks AI Evaluation PipelinesParallel batch scoring with progressive filtering, from thousands of candidates to ranked shortlists LLM Content GenerationMulti-step chains: analysis → generation → review, with structured JSON handoff and PII safety Prompt EngineeringFew-shot, Chain-of-Thought, JSON output shaping, injection hardening AI-Augmented WorkflowsLLM-powered trend mining, listing enrichment, narrative filtering, sentiment tracking Next.js / ReactApp Router, server/client components, custom hooks, context, real-time polling TypeScriptStrict types, shared interfaces, type-safe API client layer Tailwind CSSCustom themes, responsive design, dark mode, component-level styling Real-Time UILive status displays, polling, optimistic updates, loading states, error boundaries Browser ExtensionsChrome extensions with session-aware state, DOM mutation, persistent storage Flask / PythonApp factory, Blueprints, APScheduler, background workers, JWT auth Supabase PostgreSQLRPC functions, RLS policies, JWKS verification, admin vs anon clients Auth & SecurityJWT/JWKS verification, OAuth (Google/LinkedIn), PKCE flow, session refresh Background WorkersScheduled jobs: data fetching, evaluation, auto-apply, daily catch-up API IntegrationREST APIs, OAuth flows, webhooks, rate-limited clients Data AggregationMulti-source ETL: APIs, ATS drains, RSS feeds, HTML scrapers, all normalised into one schema DeduplicationMulti-layer: external ID, strict hash, fuzzy hash with description fingerprinting Web ScrapingPlaywright stealth, proxy rotation, rate limiting, structured extraction Data WranglingCSV workflows, Google Sheets automation, regex parsing, market signal extraction Browser AutomationPlaywright stealth, ATS form detection, Tampermonkey scripting, anti-detection n8n / ZapierMulti-step workflows with credentials, retries, triggers, GPT-enhanced pipelines Trading LogicMulti-API trade automation, LLM-based narrative filtering, sentiment tracking Shopify & MultichannelStore setup, Otto/Kaufland/Amazon/eBay feeds, unified pricing and inventory Product & SEO AutomationListing enrichment, AI-powered descriptions, feed pipelines, ERP integration Docker & CRONContainerized services, scheduled aggregation, health monitoring, keepalive scripts Resilience EngineeringRate limiting, circuit breakers, exponential backoff, health dashboards GitHub WorkflowsMulti-repo management, branch-per-sprint workflow, CI scripts Solo Product DevelopmentRoadmap, sprint planning, iterative delivery, all self-managed across 4 phases Stakeholder TranslationConverting vision to technical scope, feature mediation, cross-department coordination Client OperationsOnboarding flows, KYC workflows, CRM systems, support tooling GDPR / DSGVO ComplianceData export, account deletion, PII stripping, cookie consent, legal pages

Let's talk.

I'm open to roles where I can contribute across the stack, build real products, and work in a structured team environment.

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