Tessl

tessl.io

London, United Kingdom

11-50 employees

LinkedIn Profile

About Tessl

software development, developer tooling, ai dev tooling, ai native development, ai native, dev tools, specs for open source libraries, spec registry, specification updates, specification versioning, specs for security, long-term memory for specs, regression test suites, open source software, agent guidance, spec registry api, specs for dependency versioning, specs for ai safety, trustworthy ai, spec-driven development

Tessl's Tech Stack

11 technologies detected · 3 decision makers · Emails available

Sales Outreach Angle

Tessl is a technology company. Software vendors, dev tools, and SaaS platforms find technology companies like this highly receptive. Use StackWho to identify the right decision-maker (CTO, VP Eng, or Head of Product) and reach out with a stack-specific pitch.

Tessl's Position in the StackWho Database

• Tessl is 1 of 194,140 information technology & services companies tracked in StackWho.
• 193,618 information technology & services companies in our database have verified decision-maker emails (100% of the cohort).
• 74,148 information technology & services companies are in the 11-50 employee range (same size as Tessl).

Technology detection from public web signals. Decision-maker contacts compiled from LinkedIn public profiles, company filings, and verified outbound testing. Methodology & sources · Updated August 2026.

Frequently Asked Questions

What technology does Tessl use?

Tessl uses Cloudflare DNS, Gmail, Google Apps, MailChimp SPF, CloudFlare Hosting, ShareThis, and 5 more technologies. This data is sourced from StackWho's technology detection engine.

How do I contact the decision makers at Tessl?

StackWho has verified email addresses for 3 decision makers at Tessl. Pro members can access direct emails for the CEO, CTO, VP of Engineering, and other key contacts. Use StackWho to reach Tessl directly for sales, recruiting, or partnerships.

What industry is Tessl in?

Tessl operates in the information technology & services industry, headquartered in London, United Kingdom. StackWho tracks technology stacks and decision maker contacts for companies across all industries.

Can I export Tessl's contact data?

Yes. StackWho Pro members can export decision maker contact data for Tessl and similar companies to CSV. Use the export feature to build targeted prospect lists segmented by technology stack, industry, or location.