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I’m Steffen Haase, a senior backend engineer and software architect with 15+ years of experience building scalable backend systems, database architectures, and developer tooling. I’ve led engineering efforts across high-volume platforms and mission-critical deployments, with deep hands-on expertise in PHP (Laravel/Lumen and my Beacon framework), Node.js, and distributed systems. I also bring leadership experience from serving as CTO and co-founder, mentoring teams, strengthening engineering practices, and improving CI/CD and security. I enjoy performance tuning across MySQL/MariaDB, ClickHouse, and MongoDB, hardening server and infrastructure setups, and creating practical tooling—like open-source SDKs and integrations—to help teams ship reliably.…I’m Steffen Haase, a senior backend engineer and software architect with 15+ years of experience building scalable backend systems, database architectures, and developer tooling. I’ve led engineering efforts across high-volume platforms and mission-critical deployments, with deep hands-on expertise in PHP (Laravel/Lumen and my Beacon framework), Node.js, and distributed systems. I also bring leadership experience from serving as CTO and co-founder, mentoring teams, strengthening engineering practices, and improving CI/CD and security. I enjoy performance tuning across MySQL/MariaDB, ClickHouse, and MongoDB, hardening server and infrastructure setups, and creating practical tooling—like open-source SDKs and integrations—to help teams ship reliably.

Steffen Haase

Back-End Developer, Software Engineer, Fractional CTO

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I’m Steffen Haase, a senior backend engineer and software architect with 15+ years of experience building scalable backend systems, database architectures, and developer tooling. I’ve led engineering efforts across high-volume platforms and mission-critical deployments, with deep hands-on expertise in PHP (Laravel/Lumen and my Beacon framework), Node.js, and distributed systems. I also bring leadership experience from serving as CTO and co-founder, mentoring teams, strengthening engineering practices, and improving CI/CD and security. I enjoy performance tuning across MySQL/MariaDB, ClickHouse, and MongoDB, hardening server and infrastructure setups, and creating practical tooling—like open-source SDKs and integrations—to help teams ship reliably.…I’m Steffen Haase, a senior backend engineer and software architect with 15+ years of experience building scalable backend systems, database architectures, and developer tooling. I’ve led engineering efforts across high-volume platforms and mission-critical deployments, with deep hands-on expertise in PHP (Laravel/Lumen and my Beacon framework), Node.js, and distributed systems. I also bring leadership experience from serving as CTO and co-founder, mentoring teams, strengthening engineering practices, and improving CI/CD and security. I enjoy performance tuning across MySQL/MariaDB, ClickHouse, and MongoDB, hardening server and infrastructure setups, and creating practical tooling—like open-source SDKs and integrations—to help teams ship reliably.

Available to hire

I’m Steffen Haase, a senior backend engineer and software architect with 15+ years of experience building scalable backend systems, database architectures, and developer tooling. I’ve led engineering efforts across high-volume platforms and mission-critical deployments, with deep hands-on expertise in PHP (Laravel/Lumen and my Beacon framework), Node.js, and distributed systems.

I also bring leadership experience from serving as CTO and co-founder, mentoring teams, strengthening engineering practices, and improving CI/CD and security. I enjoy performance tuning across MySQL/MariaDB, ClickHouse, and MongoDB, hardening server and infrastructure setups, and creating practical tooling—like open-source SDKs and integrations—to help teams ship reliably.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Language

Work Experience

Senior Backend Engineer at Kasagi Labo

October 1, 2025 - January 1, 2026

Led production migration of cloud infrastructure from staging/testing to GCP production systems. Executed large-scale database migration and cleanup operations while preserving data integrity and improving platform stability. Mentored junior developers and strengthened deployment workflows and overall engineering practices.

Senior Backend Developer at Indoleads.com

November 1, 2019 - March 1, 2025

Designed and maintained backend architecture for a high-volume affiliate marketing platform, managing and optimizing large-scale MySQL, ClickHouse, and MongoDB deployments. Built an open-source custom Lazada SDK for offer and conversion tracking integrations. Developed internal automation tools including notification bots, developer utilities, and browser extensions. Performed security-focused code reviews, enforced best practices, led Agile ceremonies, and mentored developers across multiple teams.

Chief Technology Officer & Co-Founder at ADD Holdings / ADD Blockchain / ADD Foundation

August 1, 2017 - September 1, 2019

Defined technical strategy and architecture for blockchain-focused products and services. Led frontend and backend engineering across multiple business units, designed and deployed smart contracts and enterprise blockchain solutions, and delivered technical consulting, infrastructure planning, and client training. Managed Linux and Windows infrastructure environments.

System Administrator at Wirkes Dirndl & Trachtenmoden GmbH

October 1, 2015 - October 1, 2016

Managed server and client infrastructure for retail operations, administered POS systems and operational databases, and ensured high availability for business-critical systems.

Software Engineer & Infrastructure Consultant (Freelance)

March 1, 2013 - July 31, 2017

Delivered custom software solutions for clients across multiple industries. Designed infrastructure architectures and security solutions, conducted technical training and consulting engagements, and researched and implemented early blockchain technologies and smart contracts.

Software Engineer & Infrastructure Consultant at Freelance

March 1, 2013 - July 1, 2017

Delivered custom software solutions for clients across multiple industries, including infrastructure architecture and security solutions. Conducted technical training and consulting engagements, and researched early blockchain technologies and smart contracts.

System / Network Administrator at OptWare GmbH

November 1, 2008 - February 1, 2013

Managed Linux and Windows enterprise environments and designed network security solutions including intrusion prevention systems. Supported software development projects for automotive clients such as BMW, Audi, and Mercedes-Benz.