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Building your next great thing with 12+ years of Ruby on Rails experience

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With more than 10 years of experience in Ruby and Ruby on Rails, I have a track record of delivering high-quality solutions that meet both functional and design requirements. Throughout my career, I have collaborated closely with product managers and UI/UX designers to scope, design, and implement complex projects. I have also worked with both back end and front end technologies, including React with TypeScript. In addition, I have some experience with a variety of other programming languages, including Go, Elixir, C++, Haskell, Python, and Java, as well as developing my own toy programming languages and DSLs. As a passionate learner, I am always looking for opportunities to work with like-minded people and build the best software possible. During my PhD, I worked on the open-source project Bohrium, which allows for automatic parallelization of NumPy and Ruby code written in C++. Additionally, my implementation of a CSP framework for Ruby benchmarked better than the Python implementation at the time. I am comfortable working remotely and believe that effective communication is key to successful collaboration. When I am not at my computer, I enjoy geocaching, playing board games, and cooking. Jokingly, I have made stickers for my own jam brand. I am committed to becoming the best version of myself and would welcome the opportunity to bring my skills and enthusiasm to your team.

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Senior Full Stack Software Engineer

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I'm Dallas Hart, a Senior Full-Stack Software Engineer with over a decade of experience building scalable, secure, and AI-integrated applications across fintech, healthcare, and e-commerce. My career has been driven by a passion for solving real-world problems through clean architecture, intelligent automation, and collaborative product development. My journey began with a love for building things that make people's lives easier — starting from early scripting projects to leading cloud-native application rollouts used by thousands. I’ve architected HIPAA-compliant health portals, PCI-secure payment platforms, and AI-powered fraud detection engines — all while optimizing for performance, reliability, and user experience. Whether I’m modernizing legacy systems or deploying microservices on AWS Lambda, I keep my focus on delivering measurable business outcomes. One of my proudest achievements was leading the development of a patient portal that reduced admin workload by 30%, while also integrating third-party AI to personalize content and drive engagement. I also designed a fraud detection system that cut chargebacks by 26% — blending ML with real-time Kafka and GraphQL. I bring a rare combination of deep technical expertise, strong product sense, and cross-functional collaboration. I thrive in environments where I can work closely with stakeholders and turn ambiguous business needs into robust systems that scale. If you're looking for someone who can own the full stack, drive AI integration, and push for engineering excellence — I’m your guy.

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Experienced Rails developer dedicated to the craft of engineering

Most recently, I worked at Rhino, a startup in the proptech space. I joined the integrations team where I built the core infrastructure to integrate with partner systems. I also worked on various projects ranging from designing APIs and fixing bugs to implementing features. This role allowed me to contribute significantly to the company's growth and success. Prior to Rhino, I worked at the New York City Department of Information Technology and Telecommunications. There, I was involved in renovating and upgrading several city products and services. This experience honed my skills in working with legacy systems and integrating them with modern technologies, further deepening my expertise in Ruby on Rails. In addition to my professional experience, I launched loominex.io, a maintenance management system that I built from the ground up. This entrepreneurial venture allowed me to explore the full spectrum of product development, from sketching the UI and designing the database schema to choosing the right tools and structuring the Rails project. Although the venture did not ultimately succeed, it was an invaluable learning experience that enriched my skills and knowledge. I am passionate about the craft of engineering and have dedicated my career to Ruby on Rails for over six years. My unique blend of startup experience, government work, and entrepreneurial ventures positions me well to tackle complex challenges and deliver robust, user-centered solutions. I thrive in collaborative environments and am always eager to contribute to innovative projects and dynamic teams.

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Pragmatic and cooperative, enterprising autodidact, valued collaborator, organizer of Amsterdam Ruby Community events.

High response rate

History After finding a hole in the company website after 2 months of joining as a System Administrator, I had the possibility to change from my role into my passion: software development. That's 17 years ago. From that moment onward, I learnt more languages (C, PHP, and amongst others my biggest love Ruby). Working with databases (most notable: MySQL / MariaDB, PostgreSQL), containerization, ops (using Terraform on AWS, GCP mostly). 7 years ago I discovered I am best suited to help my colleagues grow, and turned into a Rails/Ruby/database/Javascript/HTML teacher at a bootcamp, became a (part time) engineering manager. I've been implementing in Ruby/Rails for 50% of my time for the last 2 years, the rest leading teams and advising C suite execs. My main addition ...to any team is improving morale, by coaching and helping to build quality software, focusing on metrics for both errors and processing time, helping engineers of any experience level grow, and - as an individual contributor, but also as a leader - to only use complex solutions if the problem domain warrants it. Most recently I've switched towards building my own company that aims to reduce energy consumption and CO2 footprint for households. Tiny (IOT) devices, software in C, C++, Rust, and clearly building the required backends in Rails or Rust. Well connected: Apart from that, I am one of the organizers of Ruby NL, for which I've been hosting EuRuKo (2019), NoRuKu (2020), and monthly community events of Amsterdam Ruby organisation amsrb.org. If you want a platform where your engineers can present how you solve problems: Contact me!

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