Seed Developer tools companies in New York

IDEs, runtimes, frameworks, and platforms built primarily for engineers. Filtered to Seed-stage companies headquartered in New York.

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Built from a search like: “Top Seed Developer tools companies in New York”

Ranked by current headcount across Seed Developer tools companies in New York. Refreshed monthly.

1
Verse Medical· New York, New York, United States
At Verse, we're building software that enables hospital-quality care at home. We're funded by top healthcare and technology investors, including Y Combinator, SignalFire & Sapphire Ventures.We're growing our team aggressively across every department. If you're interested in working on software that changes how healthcare is delivered, please check out our open roles here: https://jobs.ashbyhq.com/versemedical/
- Seed
- 227 employees
- Founded 2018
2
Per Diem· Brooklyn, New York, United States
Per Diem is the AI operating system for cafés, bakeries, and restaurant franchises. Built natively on Square, we help merchants launch branded ordering, loyalty, and marketing apps and automate the workflows around them. Today, 500+ brands including Oakberry, Think Coffee, and Chip City use Per Diem to own their customer relationships without third-party fees or fragmented tools.
- Seed
- 209 employees
- Founded 2021
3
Dayshape· New York, New York, United States
Dayshape delivers leading resource management software designed to help organizations achieve extraordinary results. Trusted by Big Four and many other top professional services firms globally, Dayshape is the only solution that combines advanced AI, real-time project financials, and firm-wide insights –enabling customers to elevate resource management into a strategic function. With built-in security, Dayshape is trusted by top 100 firms worldwide. We’re proud to be defining the future of AI-powered resource management.Who uses Dayshape?The entire firm including resource management teams, partners, C-suite, engagement managers and practitioners.
- Seed
- 177 employees
- Founded 2013
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4
Lemon.io· New York, New York, United States
Lemon.io is the marketplace that connects early-stage startups with vetted engineers. We provide the end-to-end product to help founders hire faster and easier.
- Seed
- 173 employees
- Founded 2015
5
Lifesight· New York, New York, United States
Lifesight is the Agentic Unified Marketing Measurement Platform that helps marketing and finance teams measure true marketing ROI, optimize budgets, and make better decisions with confidence.Unlike traditional attribution tools that rely on correlation, Lifesight combines Marketing Mix Modeling (MMM), Incrementality Testing, and Causal Attribution into a unified measurement framework to uncover the true incremental impact of every marketing investment.Powered by AI agents, Lifesight transforms measurement into action. Teams can analyze performance, forecast outcomes, optimize budgets, detect anomalies, and generate executive-ready insights from a single source of truth.Trusted by hundreds of global brands, Lifesight enables organizations to move beyond fragmented analytics and platform-reported metrics to gain a unified, causal understanding of what drives business growth.Measure. Optimize. Decide. Forecast.
- Seed
- 170 employees
- Founded 2017

6
XY Retail· New York, New York, United States
Retail didn’t get more complex - it got fragmented.Over time, POS, OMS, Clienteling, payments, reporting, and integrations evolved in isolation. Each system worked on its own. Together, they created friction, blind spots, and operational drag.XY Retail is a Retail Operating System.A Retail OS isn’t another layer on top of existing tools. It’s the system that coordinates them managing state, workflows, and decisions across every retail touchpoint, in real time.We build XY for global retailers that need their stores, digital channels, and operations to function as one system, not a collection of loosely connected products.We don’t believe in fragmented stacks, delayed visibility, or discovering problems after customers feel them.XY is built for the realities of modern retail: global rollouts, peak traffic, fiscal complexity, offline resilience, and continuous change.This isn’t retail software.This is retail infrastructure.
- Seed
- 159 employees
- Founded 2018
7
Insense· New York, New York, United States
Insense is the all-in-one solution for scaling UGC production and influencer marketing; offering both a creator marketing platform and fully managed services if short on time.The platform streamlines operations with features like creator chat, interactive briefs, automated payments and contracts, analytical reporting, and integrations with Meta, TikTok and Shopify.2,000+ brands and agencies use Insense to find their perfect niche creators and run diverse collaborations from UGC and product seeding to TikTok Shop and whitelisted ads.Their carefully vetted marketplace has 115K+ UGC creators and micro-influencers from North America and 57+ countries across EMEA, APAC, and Latin America.
- Seed
- 157 employees
- Founded 2016
8
Adapty.io· New York, New York, United States
Revenue management platform to help your app make more money. Delegate the boring infrastructure to Adapty, create native paywalls in minutes, double your subscription revenue with A/B testing, and watch your app grow in real time. We're hiring! https://adapty.io/jobs
- Seed
- 152 employees
- Founded 2020
9
Stadium· New York, New York, United States
Stadium gives companies a single, streamlined way to engage anyone—employees, clients, candidates, and partners—with swag, snack boxes, gifting, and rewards delivered in endless ways, anywhere in the world. So you can recognize and engage more, while managing less.
- Seed
- 150 employees
- Founded 2013
10
Rilla· Long Island City, New York, United States
Rilla is the leading AI coaching platform for in-person sales.Reps record their in-person sales conversations with the Rilla app, and our AI automatically transcribes, analyzes, and delivers feedback giving managers 100% visibility into what's happening in the field.Our mission is to make the offline world as searchable and easy to understand as the internet.Trusted by thousands of sales teams across home services, home building, automotive, dental, senior living, and more.We're a team of obsessive builders and world-class talent, united by one big mission and we're hiring → rilla.com/careers
- Seed
- 145 employees
- Founded 2019

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Find engineers at Seed Developer tools companies in New York

Searching for “engineers at top Seed Developer tools companies in New York” surfaces this slice of the market. The list above ranks Developer tools companies headquartered in New York whose latest disclosed round is Seed, by current headcount, drawn from public LinkedIn and Crunchbase records. With 641 matching companies in Refolk’s index, this is a tight read on where the Developer tools talent in New York is heating up.

Three filters at once narrows the field hard. The companies that survive all three - Seed, Developer tools, in New York - are usually the most targeted recruiting pool a hiring manager can ask for. Senior engineers, founding designers, and product leads here are about to become Developer tools’s next operators and angel investors.

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How this list is built

Refolk pulled Developer tools companies headquartered in New York whose latest disclosed funding round is Seed from public LinkedIn and Crunchbase records, ranked them by current employee count, and kept those with at least 3 employees. The list refreshes monthly.

Last refreshed: Tue, 27 Oct 2026 23:46:47 GMT

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The list draws on the public company graph - headcount and growth signals, funding history, and recency. The criteria chips at the top show exactly which filters produced it, and the methodology section explains the ranking.

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