We watch the contract between systems.
DevFlow Monitoring was founded in March 2021 by Marcus Holloway (ex-Datadog) and Priya Iyer (ex-PagerDuty) after they spent the prior decade watching customers find regressions in their APIs from the customer side. The product is the focused tool we wanted, and didn’t have, in those jobs.
Team
Marcus spent four years at Datadog working on Synthetics, where he kept watching customers find out their APIs had broken from their customers. He started DevFlow with Priya in 2021 to put the API contract — request, response, latency — in the same place teams already watched their infrastructure.
Datadog (Senior PM, Synthetics 2017–2020) · AWS Solutions Architect 2014–2017 · UC Berkeley CS 2012
marcus@devflow.ioPriya led the alerting platform at PagerDuty for three years and built the first version of Stripe’s API analytics. She runs DevFlow’s engineering org and writes the postmortem for every Sev-1 we’ve ever had — there have been six.
PagerDuty (Staff Engineer, alerting 2018–2021) · Stripe API team 2014–2018 · Carnegie Mellon CS 2013
priya@devflow.ioJonas joined from Cloudflare in September 2023. He owned the Workers KV team during its hyperscale years and rebuilt our edge probe network in his first six months — the 14-region quorum is his work.
Cloudflare (Engineering Manager, Workers KV 2019–2023) · Spotify Backend 2014–2019
jonas@devflow.ioSarah came to DevFlow from LaunchDarkly where she ran the Experimentation product line. She now owns the roadmap, customer interviews, and the "what should DevFlow not become" conversation.
LaunchDarkly (Director PM, Experimentation 2020–2024) · Twilio (Product 2016–2020) · UCL Computer Science 2012
sarah@devflow.ioKelly has been the first call for every Tier-2-and-up customer since April 2023. She is the reason DevFlow’s NPS is 71 and the reason we have a long memory about every account.
Mailgun (Senior CSM 2021–2023) · Twilio (CSM 2017–2021)
kelly@devflow.ioRohan owns DevFlow’s 14-edge probe fleet, the assertion engine, and the work to bring sub-10-second checks to Scale tier. He wrote the response-shape DSL.
Cloudflare (Senior Engineer, Edge Compute 2018–2022) · Akamai 2013–2018
Amaia owns the SLO product line — error-budget accounting, multi-window alerting, and the new burn-rate visualisations. She wrote our SRE workbook.
Honeycomb (PM 2021–2024) · Etsy (Engineering Effectiveness 2018–2021)
Theo built and now owns the integration plane — Slack, PagerDuty, Opsgenie, Linear, Datadog, Grafana, Splunk, and the webhook protocol with HMAC verification and the replay buffer.
Heroku (Engineering 2017–2023) · Mozilla (Mobile Web 2014–2017)
Funding
- Seed$2.8MNovember 2021Lerer Hippeau
- Series A$14.4MMay 2024Battery Ventures (Lerer participated, Tom Preston-Werner angel)
Values
We watch the contract. Not the server. Not the log. The thing your customer’s code depends on.
Boring is the highest praise. Reliability tools should not surprise you. We optimise for predictability over excitement.
We dogfood every part of the product. Our own status page is built on our status pages. Our own pagers fire on our own SLOs. If we wouldn’t use it, we don’t ship it.
We hold ourselves to public SLOs. See /status for our targets and attainment.