Engineered for absolute speed.
We build custom front-end architectures for B2B teams who refuse to compromise on performance. No templates, no page builders, just pure engineering.




Proven in production.
Every repository is optimized for Core Web Vitals. These custom marketing engines deliver flawless rendering speeds, clean codebases, and conversion-ready architectures for modern teams.
Apex Ledger Platform
Vektor Security Site
A high-performance marketing site built with custom React components, achieving a perfect 100 Lighthouse score and a 42% increase in demo sign-ups within thirty days.
A component-driven marketing engine featuring interactive architectural diagrams, built with zero bloated code and fully optimized for enterprise search and organic pipeline growth.
Speed is our baseline.
100
Lighthouse Score
0.4s
Average LCP
0ms
Blocking Time
Engineered for impact.
Subsecond rebuilt our marketing site in weeks. Our page speed went from sluggish to instant, and our conversion rate jumped by 35% overnight.
Sarah Jenkins, VP of Marketing at Vektor
The custom React component architecture they delivered is incredibly clean. Our internal team can now ship landing pages without any engineering bottlenecks.
Marcus Chen, CTO at Apex Ledger
Subsecond
Sub-second front-end for high-growth B2B.
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build@subsecond.dev
San Francisco + Remote
Sub-second load guarantee
© 2026 Subsecond-Zero templates. Zero bloated code.
PERFORMANCE-FIRST DEVELOPMENT
