#2 of the day We launched LoopLab on Hacker News 4 days ago — it is live for free until Friday. Read the post →
Live now · $42k MRR ARR YLaunched on HN 4 days ago · #2 of the day 🏆 Built by Raj Bhardwaj · solo-shipping in San Francisco, CA

LoopLab is how product engineers ship pull requests in their sleep.

Building LoopLab — background agents that ship pull requests while you sleep. YC W24. We do the tests, the linting, the scaffolding so you don't have to context-switch at 11pm.

Start shipping free Watch the 90-sec demo No credit card · 50 PRs/mo free forever
Teams shipping on LoopLab →
ARR
$42k MRR
+38% month over month
Users
2.2k
+312 in the last 7 days
Uptime
99.98%
last 90 days · zero P0s
NPS
71
n = 140 · Apr 2026
AS SEEN IN
TechCrunchThe InformationLenny's Newslettera16z PodcastPragmatic EngineerHacker NewsProduct HuntThe Pragmatic Engineer TechCrunchThe InformationLenny's Newslettera16z PodcastPragmatic EngineerHacker NewsProduct HuntThe Pragmatic Engineer
01 · Numbers that matter

Everything we'd show a Series A partner.

Updated every Monday from the production dashboard. No vanity metrics, no cohort-shopping, no manipulated denominators.

ARR+38% MoM
$504K/yr
140 paying teams · $300 ACV · 4-month-old product
CAC payback2.1 months
64days
Blended paid + organic. Organic alone pays back in 31 days
Gross margin
87%
Inference costs passed through. Infra break-even at month 11
Weekly active+22% WoW
1.8k
Of 2,200 signed-up users. Median 4 PRs/user/week
Logo retention
96%
Net revenue retention sitting at 118% — we upgrade more than we lose
HN rank (launch)#2 of the day
842pts
3.8k upvotes · 412 comments · featured on Product Hunt #1 same week
02 · The founding note

How it started → how it is going.

Written by Raj Bhardwaj, 6:14am SFT, the morning after demo day.

Dec 26, 2023 · Day 0
Two founders, zero revenue, a Figma and a Postgres.

Christmas night, I pushed the first commit from a hotel room in Bangalore. Zero revenue, one Postgres, one Figma, and an overconfident bet that I could build it in six weeks.

By mid-January the demo worked. Pushed it to two ex-colleagues, they both tried to pay for it, and I realised this was the thing. YC application went in that Friday.

Apr 19, 2026 · Today
six people, $42k MRR ARR, and a real team.

Team of six. 140 paying teams, $42k MRR, 38% month-over-month. Infra has been break-even for five months. The design-partner waitlist is at 2,200 and we are gating carefully.

Raised our $4.2M seed from Accel in Feb, keeping the round small on purpose. Targeting $1.5M ARR by demo-day to justify the Series A we do not yet need.

03 · Operator resume

Operators I've been.

Ten years of being the person on call when something breaks. Four exits, two outages, one actual heart-rate monitor.

Founder & CEO
LoopLab (YC W24)Seed · YC W24SF HQ
Jan 2024 – Present
San Francisco
Solo-coded the first prototype over Christmas break, into YC three weeks later. Raised $4.2M seed from Accel, SV Angel, and 14 operator angels. Team of six, breakeven on infrastructure costs at month eleven. 2,200 design partners on the waitlist, 140 paying teams live.
zero-to-onefundraisinghiringTypeScriptagents
Impact: $4.2M raised · 2,200 waitlist · 140 paying
Engineering Manager, Platform Infra
RampSeries DNYC HQ
Mar 2021 – Dec 2023
New York, NY
Employee #17, built the platform-infra team from two to nineteen. Owned the rewrite of the ledger service (single-node Postgres to partitioned Citus) that unlocked the $8B TPV year. Reported to the CTO. Hired seven engineers, promoted four. On-call for two Black Fridays with zero customer-visible incidents.
platformpostgrescitusEMhiring
Impact: $8B TPV/yr · Team of 19 · 0 P0s · 2 BFs clean
Senior Software Engineer
StripePre-IPOSF HQ
Jul 2019 – Feb 2021
South San Francisco
Developer-productivity team. Shipped the mono-repo change-detector that dropped CI time from 42 minutes to 7. Owned the TypeScript + Ruby migration tooling for 2,000 engineers. Internal Grand Prix winner 2020 for Dev Tool of the Year.
dev-toolsmonorepotypescriptruby
Impact: -83% CI time · 2k engineers impacted
Founding Engineer
Clerky (acq.)YC S16SF HQ
Aug 2017 – Jun 2019
San Francisco
Hire #3 at a legal-tech YC company. Owned the document-generation pipeline and the state-machine that runs 400+ incorporation flows. Company acquired by Carta in 2019; I stayed through the eighteen-month earn-out.
foundingrailsstate-machineslegal-tech
Impact: Acquired by Carta · 3rd engineer · state-machine owner
Software Engineer
AtlassianPublicSydney HQ
Jun 2015 – Jul 2017
Sydney, AU
Graduate program, Jira Cloud team. Shipped the webhooks v2 API, reduced webhook delivery latency p99 from 14s to 800ms. First internal speaker at the Sydney graduate welcome day 2017.
javaapisjiragraduate
Impact: -94% p99 latency · First-year shipper award
04 · Public launches

What I've shipped.

Every project here has a public URL, a launch post, and a working demo. No slides, no hand-waving.

APR2026
LoopLab · Background Agents Live
TypeScript · Rust · Postgres · Anthropic
The core product. Give LoopLab a repo and a spec, it opens a pull request while you sleep. 140 paying teams, $42k MRR four months after launch.
842
HN points
2.1k
GH stars
1.8k
DAU
$42k MRR
Revenue
OCT2024
tsdown OSS
TypeScript · esbuild · Rolldown
Zero-config TypeScript bundler that ships in under 50KB. Started as a weekend project, now the default bundler for two YC companies. Front-page HN for 11 hours.
612
HN points
4.8k
GH stars
DAU
Revenue
MAR2024
PGWatch OSS
Go · Postgres · Grafana
Postgres slow-query watcher that emails you the regression before the user files a ticket. Used in production at three YC companies and one Fortune 500 fintech.
388
HN points
1.9k
GH stars
220
DAU
$0
Revenue
AUG2023
Ramp ledger rewrite Internal
Go · Citus · Kafka · internal
The partitioning project that let Ramp cross $8B TPV without adding hardware. Internal-only; presented at Stripe Sessions 2023 as a case study.
HN points
GH stars
40k
DAU
$8B TPV
Revenue
NOV2020
stripe-mono CI rewrite Internal
Bazel · Ruby · TypeScript
Internal change-detection rewrite at Stripe that dropped the mono-repo CI from 42 to 7 minutes. 2,000-engineer impact. Internal Grand Prix 2020.
HN points
GH stars
2k
DAU
Revenue
05 · Voices

Other founders, unprompted.

Screenshots on the wall of the SF apartment. Real people, real companies, nothing paid.

“I shipped three features last weekend while my baby slept. LoopLab is the first dev tool that paid for itself in the first week. Buy it before Raj puts the price up.”
PV
Priya Venkat
Founder at Thread (YC S23)
“Used to burn 8 hours of an intern's week on changelog PRs. LoopLab does it in 20 seconds. We moved the intern onto actual features. Also Raj ships on Sundays.”
DO
Daniel Okonkwo
CTO at Clave Health
“We tried the four competitors, LoopLab is the only one that doesn't hallucinate imports. I do not know what they did differently but it shows in every PR. Worth every cent.”
ML
Mei-Lin Zhao
Staff Engineer at Figma
06 · Concrete skills

Not "proficient in Python." Actual numbers.

Every skill here is backed by a receipt — a pitch deck, a PR, a stripe dashboard, a git blame.

Fundraising· $4.2M raised (Accel + SV Angel)Seed · Feb 2026
Shipping cadence· 3 features/week for 18 monthsPublic changelog
Hiring· 6 hires from 320 applications1.9% acceptance rate
Distributed systems· Scaled Postgres to $8B TPVRamp · Citus partition
LLM infra· Anthropic+OpenAI+GCP cost routing87% gross margin
TypeScript· 10 years · 2 open-source libstsdown · 4.8k stars
Go· Production since 2018 at Ramp1 service still the hot path
Podcast appearances· 4 shows (Lenny, TPE, a16z, Acquired)Acquired guest Q1 2026
07 · Press & appearances

The long paper trail.

Selected coverage from the last eighteen months. Full list including podcasts and local press available on request.

TechCrunch
“LoopLab raises $4.2M seed for background AI engineers”
Feb 12, 2026
The Information
“YC W24 startups to watch: LoopLab is the one operators are buying”
Mar 04, 2026
Lenny's Newsletter
“How LoopLab got to $40k MRR in ten weeks without a paid channel”
Mar 22, 2026
a16z Podcast
“"Agents that ship PRs" — Raj Bhardwaj on the future of devtools”
Apr 08, 2026
Pragmatic Engineer
“Inside LoopLab: 140 paying teams, 87% gross margin, six engineers”
Apr 15, 2026
2015
B.S. Computer Science
University of Waterloo
Dean's List · four co-ops including Google NYC
2017
YC Startup School
Y Combinator
Top 100 cohort · Clerky hire followed
— Ship together —

Cold email me. I read every one.

Pitches, feedback, introductions, bug reports, or "hey I want to join" — whatever it is, hit the inbox. Reply within one business day, usually sooner. No intros needed.