Author profile
Daniel Killyevo
Founder & Technical Lead
Daniel Killyevo started Design Key with a vision to empower businesses with cutting-edge technology and tailor-made solutions. After years of experience in the tech industry, Daniel recognized the gap between clients' needs and available services. This realization led to the creation of Design Key, an agency that would bridge the divide and help clients achieve their goals with better-designed products.
Daniel is an accomplished technical leader with a Master's degree in Computer Science from Poltava National Technical University (2005-2011). Born to a Ukrainian mother and Tanzanian father in Tanzania and raised in Ukraine, he brings a unique global perspective to his work.
With over a decade of experience in software development and product design, Daniel has successfully delivered more than 50 web and mobile applications. He began his career as a software developer and went on to work with prominent companies such as Ciklum, Corrigo (Terminix), and JustEat, helping build more than 40 prototypes and MVPs for startups.
His expertise includes architecting complex cloud-based software solutions, API and data integrations, and building and scaling tech teams. As a seasoned entrepreneur, Daniel has gained invaluable experience working on personal startups and establishing two software agencies.
Articles
Written by Daniel
Development
Stripe Billing for SaaS: 2026 Implementation Guide
Stripe Billing in 2026 supports tiered, per-seat, usage-based, AI-metered, and hybrid pricing in one platform. Most teams still ship integrations that break the first time a customer changes plans mid-cycle. This is the working implementation guide.
Read articleDevelopment
Agentic Code Review: What Actually Works in 2026
AI reviewers now catch 82% of bugs in benchmarks. They also greenlight code that introduces vulnerabilities 87% of the time. Here is the honest 2026 read on which tools work, which fail, and the pairing pattern teams actually ship with.
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