Where does Alfonso Subiotto Marqués work?

Alfonso Subiotto Marqués is Venture Partner at Lorimer Ventures.

What check size does Alfonso Subiotto Marqués write?

Alfonso Subiotto Marqués typically writes checks of $1K – $5K.

Where did Alfonso Subiotto Marqués go to school?

Alfonso Subiotto Marqués studied at Brown University (Bachelor of Science - BS, Computer Science).

What has Alfonso Subiotto Marqués written?

Alfonso Subiotto Marqués has 1 tracked post on asubiotto.com, including "My Journey Optimizing a CUDA Kernel with Polar Signals".

Alfonso Subiotto Marqués

Investor

Venture Partner at Lorimer Ventures

Spain

Writes $1K – $5K checks · typically $2.5K

Find your path to Alfonso

144 people in our graph share verified history with Alfonso — schools, employers, funds. One of them is your warm intro.

Mike VolpiunlockedAlfonso: together at Cockroach Labs (2016–2021)

×5Alfonso: together at Cockroach Labs

×5Alfonso: together at Brown University

Alfonso: together at Lorimer Ventures

About

Alfonso Subiotto is a Staff Software Engineer at Polar Signals, where he works on storage systems for continuous profiling data, including distributed CRDTs, diskless architectures, and deterministic simulation testing in Go and Rust. Before Polar Signals, he joined Cockroach Labs at an early stage, serving as a software engineer and tech lead on the SQL Execution team, where he built and led teams working on core execution and observability. He is also a Venture Partner at Lorimer Ventures, where he invests in developer tools and data infrastructure. He speaks at conferences about deterministic simulation testing, database systems, and Rust, and writes technical blog posts on these topics.

Experience

Polar SignalsStaff Software Engineercurrent2024 — present
Polar SignalsSenior Software Engineer2022 — 2024
Lorimer VenturesVenture Partnercurrent2022 — present
Cockroach LabsTech Lead, Distributed SQL Execution & Observability2019 — 2021
Cockroach LabsSoftware Engineer2016 — 2019New York City Metropolitan Area
GoogleSoftware Engineering Intern2014New York City
Brown UniversityTeaching Assistant (CS16: Algorithms and Data Structures)2014Providence County, Rhode Island, United States
Brown UniversityTeaching Assistant (CS15: Programming in Java)2013Providence County, Rhode Island, United States

Podcasts & interviews

featuring Alfonso Subiotto Marqués

Random Seeds and State Machines - Alfonso Subiotto | EuroRust 2025

EuroRust

Systems Distributed '25 Lightning Talks

TigerBeetle

Writing

All posts ↗

My Journey Optimizing a CUDA Kernel with Polar Signals2026-06-24

The author describes building and optimizing an FSST string decompression CUDA kernel for Vortex, using the Polar Signals GPU profiler and register buffering to achieve 3x faster decompression.', ' ', ' ', ' ', ' '.replace().And so on.']?[0]'

Colleagues at Lorimer Ventures

Alex de Ráfols

Director, PM at Affirm at Lorimer Ventures

Ishita Aloni

Engineering Manager at Loop at Lorimer Ventures

Jake Gertjan Hofwegen

VP, Revenue Ops + Enablement at Contentful at Lorimer Ventures

Joseph Zhang

Investor Relations Manager at Linear Capital

Malcolm Kerr

Director, Business Operations and Strategy at Formic at Lorimer Ventures

Nick Wijnberg

Co-Founder at Lorimer Ventures

Pete Schork

Co-Founder at Lorimer Ventures

Phil Gurbacki

VP, Product at Weights & Biases (Coreweave) at Lorimer Ventures

Frequently asked questions

Who is Alfonso Subiotto Marqués?: Alfonso Subiotto is a Staff Software Engineer at Polar Signals, where he works on storage systems for continuous profiling data, including distributed CRDTs, diskless architectures, and deterministic simulation testing in Go and Rust. Before Polar Signals, he joined Cockroach Labs at an early stage, serving as a software engineer and tech lead on the SQL Execution team, where he built and led teams working on core execution and observability. He is also a Venture Partner at Lorimer Ventures, where he invests in developer tools and data infrastructure. He speaks at conferences about deterministic simulation testing, database systems, and Rust, and writes technical blog posts on these topics.
Where does Alfonso Subiotto Marqués work?: Alfonso Subiotto Marqués is Venture Partner at Lorimer Ventures.
What check size does Alfonso Subiotto Marqués write?: Alfonso Subiotto Marqués typically writes checks of $1K – $5K.
Where did Alfonso Subiotto Marqués go to school?: Alfonso Subiotto Marqués studied at Brown University (Bachelor of Science - BS, Computer Science).
What has Alfonso Subiotto Marqués written?: Alfonso Subiotto Marqués has 1 tracked post on asubiotto.com, including "My Journey Optimizing a CUDA Kernel with Polar Signals".
What podcasts and interviews feature Alfonso Subiotto Marqués?: Tracked appearances include "Random Seeds and State Machines - Alfonso Subiotto | EuroRust 2025", "Systems Distributed '25 Lightning Talks".