Priya Nair
Staff Engineer · Mosaic Labs
I stopped updating my LinkedIn three months after we rolled this out.
— Voluntary retention up 31% · Q3–Q4 2025
Retention, visualized
Trusted by 120+ engineering orgs · Series B to IPO
Why are your best people leaving?
It's not compensation. It's not the tech stack. It's the creeping feeling that nobody notices — not the PRs they ship at midnight, not the junior they mentored through their first incident, not the moment they almost quit but stayed anyway.
of senior engineers say they leave because they felt invisible — not underpaid.
LinkedIn Talent Trends 2025
the cost of replacing a senior engineer vs. their annual salary.
SHRM Engineering Retention Report
average tenure of a senior dev at a Series B startup before their first FAANG recruiter call.
Stack Overflow Developer Survey 2025
"The engineers who leave rarely complain on the way out. They just stop raising their hand in standup, and six weeks later their access card stops working."
— Marcus Webb, VP Engineering · Thornfield Systems (Series C, 180 engineers)
What if onboarding felt like coming home?
Belong threads belonging signals into the tools your engineers already live in — Slack, Linear, GitHub, Notion. No new app to learn. No survey to ignore. Just the quiet infrastructure of feeling seen.
Onboarding Day 1
Your team already knows you
Jordan Kim
Senior SRE · Prefers async · Celebrates quietly
Asel Nurlanovna
Staff Frontend · Thrives on public recognition
< 2 hours
Time to first meaningful connection
9.1 / 10
New hire confidence score
Case Study
A 40-person engineering team.
Two quarters. One decision.
Verified outcome
−31%
voluntary turnover
Thornfield Systems
Series C · Portland, OR
Marcus Webb
VP Engineering · Thornfield Systems
"We were losing two senior engineers a quarter. Not to competitors — to the feeling that their work was disappearing into a void. Belong made the invisible visible."
Before Belong, Thornfield's engineering org had 22% annual voluntary turnover — double the industry median. After two quarters of Belong's belonging infrastructure running across onboarding, sprint retros, and 1:1 prep flows, voluntary exits dropped to 15.2%. Three engineers who had accepted FAANG offers rescinded within the pilot period.
31%
Voluntary turnover reduction
Q3–Q4 2025
2 qtrs
Time to measurable impact
~26 weeks
$2.1M
Estimated retention savings
Based on SHRM avg replacement cost
40
Engineers on the team
Series C · $38M raised
Retention trajectory · Thornfield Systems
Q1 2025 (Pre-Belong)
78%
Q2 2025 (Pilot, 3 months)
82%
Q3 2025 (Full rollout)
91%
Q4 2025 (Sustained)
95%
Two ways in
The people behind this product
practice exactly what they ship.
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We're a 22-person team that does async-first, ships weekly, and uses Belong ourselves — every feature we build, we feel first.
Senior Full-Stack Engineer
Product · Remote · Full-time
Customer Success Lead
GTM · Hybrid · Full-time
Engineering Manager
Platform · Remote · Full-time
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