Lead Software Developer and Full-Stack Engineer with 6+ years of experience building scalable SaaS platforms, AI systems, trading infrastructure, automation tools, and real-time data solutions. Experienced in leading projects from architecture to production while working across high-performance backend systems, distributed infrastructure, and modern web applications. My technical stack includes TypeScript, JavaScript, Python, Go, PHP, React, Next.js, Node.js, PostgreSQL, Docker, Redis, Firebase, and cloud-based architectures. I specialize in software architecture, API development, WebSocket systems, automation, DevOps, and scalable backend engineering. As the Founder & Lead Software Developer at Heitech.dk, I have designed and developed multiple production-grade platforms across AI, fintech, blockchain, SaaS, automation, and event infrastructure. My work focuses on building systems that improve performance, scalability, reliability, and operational efficiency. One of my primary projects is Murph, a B2B Sales Intelligence platform built with Next.js, TypeScript, and PostgreSQL. The platform enhanced outreach efficiency through AI-driven engagement systems, intelligent automation, and scalable SaaS architecture. I also developed a distributed event aggregation platform capable of processing large-scale ticketing and event data from multiple external vendors in real time. My experience also includes: • Full-stack SaaS development • AI automation and multi-agent systems • High-performance backend infrastructure • Real-time data ingestion pipelines • Blockchain and NFT integrations • WebSocket and distributed systems • DevOps, Docker, and containerized deployments • Security engineering and infrastructure hardening • API architecture and database optimization I enjoy solving difficult engineering problems, optimizing systems for scale, and turning complex ideas into production-ready products. I work well in fast-paced environments and value clean architecture, strong communication, ownership, and continuous learning. Currently open to remote Software Developer, Full-Stack Engineer, and Lead Developer opportunities worldwide. Feel free to connect, message me, or visit my portfolio if you're looking for someone who can architect, build, and scale modern software systems from idea to production.

William Hein

Lead Software Developer and Full-Stack Engineer with 6+ years of experience building scalable SaaS platforms, AI systems, trading infrastructure, automation tools, and real-time data solutions. Experienced in leading projects from architecture to production while working across high-performance backend systems, distributed infrastructure, and modern web applications. My technical stack includes TypeScript, JavaScript, Python, Go, PHP, React, Next.js, Node.js, PostgreSQL, Docker, Redis, Firebase, and cloud-based architectures. I specialize in software architecture, API development, WebSocket systems, automation, DevOps, and scalable backend engineering. As the Founder & Lead Software Developer at Heitech.dk, I have designed and developed multiple production-grade platforms across AI, fintech, blockchain, SaaS, automation, and event infrastructure. My work focuses on building systems that improve performance, scalability, reliability, and operational efficiency. One of my primary projects is Murph, a B2B Sales Intelligence platform built with Next.js, TypeScript, and PostgreSQL. The platform enhanced outreach efficiency through AI-driven engagement systems, intelligent automation, and scalable SaaS architecture. I also developed a distributed event aggregation platform capable of processing large-scale ticketing and event data from multiple external vendors in real time. My experience also includes: • Full-stack SaaS development • AI automation and multi-agent systems • High-performance backend infrastructure • Real-time data ingestion pipelines • Blockchain and NFT integrations • WebSocket and distributed systems • DevOps, Docker, and containerized deployments • Security engineering and infrastructure hardening • API architecture and database optimization I enjoy solving difficult engineering problems, optimizing systems for scale, and turning complex ideas into production-ready products. I work well in fast-paced environments and value clean architecture, strong communication, ownership, and continuous learning. Currently open to remote Software Developer, Full-Stack Engineer, and Lead Developer opportunities worldwide. Feel free to connect, message me, or visit my portfolio if you're looking for someone who can architect, build, and scale modern software systems from idea to production.

Available to hire

Lead Software Developer and Full-Stack Engineer with 6+ years of experience building scalable SaaS platforms, AI systems, trading infrastructure, automation tools, and real-time data solutions. Experienced in leading projects from architecture to production while working across high-performance backend systems, distributed infrastructure, and modern web applications.

My technical stack includes TypeScript, JavaScript, Python, Go, PHP, React, Next.js, Node.js, PostgreSQL, Docker, Redis, Firebase, and cloud-based architectures. I specialize in software architecture, API development, WebSocket systems, automation, DevOps, and scalable backend engineering.

As the Founder & Lead Software Developer at Heitech.dk, I have designed and developed multiple production-grade platforms across AI, fintech, blockchain, SaaS, automation, and event infrastructure. My work focuses on building systems that improve performance, scalability, reliability, and operational efficiency.

One of my primary projects is Murph, a B2B Sales Intelligence platform built with Next.js, TypeScript, and PostgreSQL. The platform enhanced outreach efficiency through AI-driven engagement systems, intelligent automation, and scalable SaaS architecture. I also developed a distributed event aggregation platform capable of processing large-scale ticketing and event data from multiple external vendors in real time.

My experience also includes:
• Full-stack SaaS development
• AI automation and multi-agent systems
• High-performance backend infrastructure
• Real-time data ingestion pipelines
• Blockchain and NFT integrations
• WebSocket and distributed systems
• DevOps, Docker, and containerized deployments
• Security engineering and infrastructure hardening
• API architecture and database optimization

I enjoy solving difficult engineering problems, optimizing systems for scale, and turning complex ideas into production-ready products. I work well in fast-paced environments and value clean architecture, strong communication, ownership, and continuous learning.

Currently open to remote Software Developer, Full-Stack Engineer, and Lead Developer opportunities worldwide.
Feel free to connect, message me, or visit my portfolio if you’re looking for someone who can architect, build, and scale modern software systems from idea to production.

See more

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
See more

Language

English
Fluent
Danish
Fluent

Work Experience

Founder & Lead Developer, at Heitech.dk
May 9, 2021 - Present
B2B Sales Intelligence Platform (Murph): Built Murph Sales Intelligence dashboard (Next.js, TypeScript, Postgres) from initial commit, enhancing LinkedIn outreach SaaS through ICP-driven commenting, third-party reply-intent detection, and a security patch for picomatch ReDoS vulnerability. AI-Powered Strategy Evolution Engine (sentient-evolve): Architected a multi-agent system that autonomously evolves trading algorithms Engineered a feedback loop where specialized AI agents analyze performance, generate code improvements, and self-correct compilation errors in isolated Docker containers. Multi-Exchange Trading Infrastructure (Go): Built iq-data-server in Go to ingest real-time WebSocket streams from 7+ major exchanges (Binance, Bybit, Coinbase) Hardened the high-frequency ingest path by eliminating race conditions and head-of-line blocking, bounding unbounded tracker growth, and removing unsafe upsert patterns. MusicFix Platform (Flutter, Next.js, Firebase): Enhanced production Flutter iOS/Android app, built companion musicfix-web (Next.js, 300+ files) from scratch, and developed Firebase backend with strict Firestore security rules, Cloud Functions, and Stripe integration. Event Aggregation & Ticketing (TypeScript / BullMQ): Engineered a distributed scraping platform with a producer-consumer architecture and worker threads handling high- concurrency ingestion from Ticketmaster and other vendors, normalizing unstructured data into PostgreSQL, plus the public event-interface (Next.js) and a Prisma-backed ticketing system. Automated Trading & Browser Security: Developed Chrome Extension (rolly-extension) for automated trading, implementing human-emulation algorithms to bypass modern bot detection systems. Implemented human-emulation algorithms (randomized event dispatching, heuristic DOM recovery) to bypass modern bot detection systems. https://heitech.dk
Technical Supporter at Remote Denmark
May 11, 2022 - September 15, 2023
Provided technical support for app-related issues, acting as a bridge between users and the engineering team to resolve bugs in the EV charging platform. https://www.linkedin.com/company/trueenergydk/  Resolved technical issues for clients, ensuring high levels of customer satisfaction.  Provided training and support to junior staff on troubleshooting techniques and best practices.  Implemented process improvements that enhanced response times for technical inquiries
Remote Developer, at XSpectar
April 11, 2022 - July 13, 2023
Built xspectar-nft-daemon, a local WebSocket server for subscribing to XRP Ledger stream, enabling real-time updates for NFT transactions.  Processed live transactions to verify NFT ownership and instantly update user roles across Discord and internal databases, enhancing user experience.  Processed live transactions to verify NFT ownership and update user roles instantly across Discord and internal databases.

Education

Higher Technical Examination at Tekniske Gymnasium
April 18, 2022 - July 16, 2024

Qualifications

Add your qualifications or awards here.

Industry Experience

Computers & Electronics, Energy & Utilities, Financial Services, Healthcare, Real Estate & Construction, Software & Internet, Wholesale & Distribution, Professional Services, Telecommunications, Education, Gaming, Media & Entertainment, Retail, Manufacturing