About Abacum

Abacum is the leading business planning solution for finance teams, founded in 2020 by former CFOs. Our global team of 100+ people spans 30+ nationalities across New York, Toronto, and Barcelona. We help finance teams shift from number crunching to strategic decision‑making through automated reporting, collaboration, and simplified planning. Our clients include Dish Networks, Strava, BetterUp, and many others.

What You’ll Do as a Senior Backend Engineer (Integrations Team)

• Move fluently across multiple programming languages and ecosystems beyond our core stack to read, adapt, and extend integration‑specific code such as ERP scripting frameworks, native app extensions for accounting and finance platforms, and third‑party vendor SDKs.
• Work confidently with a wide range of authentication and identity flows, including OAuth 2.0 / OIDC, SSO providers, SAML, and service‑to‑service authentication.
• Lead the design and dev...