StackOne is a London-based integration platform that gives B2B SaaS companies and AI agent builders a single unified API to connect to hundreds of enterprise systems - from HR and CRM to ticketing, messaging and identity. Combining a proprietary tool-calling LLM with a real-time, privacy-first engine, it offers 200+ pre-built connectors and thousands of ready-made actions so agents can reliably and securely take actions inside the software businesses already use. Founded in 2023 by Romain Sestier and Guillaume Lebedel, the company raised a $20M Series A led by GV (Google Ventures) in May 2025 and has surpassed 1 billion API calls.
Paismo is a people-first, AI-powered HR and payroll platform built for small and mid-sized businesses in emerging markets. Founded in 2022 by University of Pennsylvania alumni Rebecka Zavaleta and Usama Mahmud, it combines core HR, time and attendance, leave, performance management and automated payroll into one cloud system - with localized features designed from the ground up for markets that legacy HR software has long ignored. Backed by a $1.5M seed haul led by Indus Valley Capital, Paismo now spans the US, UAE, Pakistan, Mexico and Ethiopia, and has layered on Employer of Record services and a one-click payroll partnership with easypaisa.
Leapsome is an AI-powered people enablement platform that unifies the HR stack - performance reviews, goals and OKRs, engagement surveys, learning, compensation, and a core HRIS - in one place. Founded in Berlin in 2016 by Jenny von Podewils and Kajetan von Armansperg, it helps managers and HR teams run feedback, development, and alignment processes without juggling spreadsheets and disconnected tools. The company bootstrapped to profitability before raising a $60M Series A in 2022, and today serves more than 1,500 organizations including Spotify, Unity, and monday.com.
Lattice is a San Francisco-based people-management software company that helps organizations run performance reviews, set goals, gather employee feedback, manage compensation, and track engagement in one connected platform. Founded in 2015 by Jack Altman and Eric Koslow, it now serves several thousand companies and has leaned hard into AI under CEO Sarah Franklin, who joined from Salesforce in 2024.
Deel is a global HR and payroll platform that lets companies hire, pay, and manage workers in 150+ countries, handling contracts, compliance, taxes, benefits, and IT - all in one place.
Merge builds the connective infrastructure for modern SaaS and AI: one unified API that lets a product offer hundreds of HRIS, ATS, CRM, ticketing, and accounting integrations - and a newer Agent Handler that gives AI agents secure, observable access to thousands of third-party tools.
Gil Feig is the Co-Founder and CTO of Merge, the unified API platform that lets B2B software companies add hundreds of integrations to their products in days instead of months. He started coding at 12, got a cease-and-desist from Facebook at 16, and launched Merge in the middle of COVID after interviewing 100 companies before writing a single line of code. The company has raised $74.5M, serves 4,000+ customers, and named Feig and co-founder Shensi Ding to the 2023 Forbes 30 Under 30 list.
Nathan Stewart is a founding engineer at Merge (merge.dev), the unified API platform that lets B2B SaaS companies connect to hundreds of HRIS, ATS, CRM, accounting, and ticketing systems through a single integration. Based in New York and educated at The Ohio State University, Stewart is a backend developer who joined Merge in its early days and has helped scale the company to over 140 employees and $74.5M in funding. He describes himself as a 'Software Engineer & Puzzle Aficionado,' an apt description for someone building the connective infrastructure that keeps the modern SaaS stack wired together.