Solstice | 25,625 followers on LinkedIn. Solstice has retired its brand to become 'Kin + Carta.' Follow our new LinkedIn page and visit our site to learn more. | Solstice, part of Kin + Carta, is a modern software engineering firm that helps Fortune 500 companies seize new opportunities through world-changing digital solutions. As strategists and consultants, we help organizations evolve their digital strategy to solve mission-critical problems. As designers and developers, we build incredible hardware and software solutions that transcend a standalone product and transform an organization’s relationship with its customers.