The founder · David Marin
The whisper between every quota miss and the deal of your life.
Sussur is built solo by one operator who has shipped at Y Combinator velocity and at enterprise scale. Two YC interviews. A published paper. Eight years of sales-tooling instinct. Three months of production code. Three named advisors. Here is the full story.
David Marin · Founder, CTO and owner of SC Basetool Labs SRL. Building Sussur full-time since 17 March 2026.
Constanța · Romania · macOS · solo until close
Serial founder. Two YC interviews.
Co-founded Avo (open-source Rails admin, Y Combinator S21 interview) and Basetool (database admin tool, Y Combinator W22 interview) with brother Adrian Marin. Avo hit #2 Product of the Day on Product Hunt. Adrian continues Avo solo today.
Sussur is the third take. This time the product is on-device real-time sales coaching for the four million individual-buyer salespeople the enterprise tools cannot reach.
Both speeds. Same operator.
Eight years across the YC ecosystem and at enterprise scale. Waydev (YC W21) as an early engineer for startup-velocity discipline. The Social Cat as lead dev on an influencer marketing platform. Amdocs on the Vodafone enterprise engagement. Deloitte Digital on the consultancy side.
BSc Computer Science, University of Twente (2019). Best Thesis Award in the Data Science track. Co-author of Effectiveness of neural language models for word prediction of textual mammography reports (Marin, Mocanu, Seifert), IEEE Xplore 2020.
Ironman finisher.
Three months. One operator. Production.
Sussur shipped v0.10.25 in three months of solo execution. Every layer: macOS audio capture, on-device speech-to-text via NVIDIA Parakeet TDT, multi-LLM orchestration via OpenRouter, RAG pipeline, six-signal rapport algorithm, persona memory, post-call dossier with emotion timeline.
The traction page → has the live numbers. The marketing site you are reading is the same operator, same cadence.
On stage · Gluon Conference
We put Sussur on stage and ran it live.
Pitched Sussur and ran a live, on-device demo at the Gluon Conference. The audio never left the Mac.
· Biometrics House · Bratislava
Watch the pitch on YouTube
Three named advisors
- Paul Burca
- Founder, Assista AI (Gluon Syndicate portfolio, Feb 2025)CEE AI fundraising, Gluon process, post-SAFE GTM
- Alex Circei
- Founder/CEO, Waydev (YC W21)Enterprise B2B GTM, YC ship cadence
- Adrian Marin
- Co-founder, Avo (avohq.io)Product and go-to-market (brother)
For investors
Talk to David.
Fifteen minutes is enough to know if Sussur fits your portfolio. Calendly is the fastest path; email is the fallback.