Senior Back End Engineer (Integrations) at Abacum

Abacum is the leading Business Planning solution for finance teams to drive performance. By automating reporting, enabling collaboration, and simplifying planning and forecasting, we help finance teams shift from number crunching to driving strategic decisions.

Founded in 2020 by two former CFOs, we’ve grown into a global team of 100+ people across 30+ nationalities. Headquartered in New York, we have offices in Toronto and Barcelona. We’re trusted by industry leaders such as Dish Networks, Strava, BetterUp, Kajabi, JG Wentworth, Abridge, Cortex, and hundreds more.

We have raised over $100m, closing in June 2025 our $60M Series B, led by Scale Venture Partners, with the strong participation of Cathay Innovation, Y Combinator, Atomico, Creandum, and angel operators from Adyen, Zapier, and Twitch.

Our mission is ambitious and we can’t do it alone—join Abacum as we build the future of Business Planning!

Being a Software Engineer at Abacum means...

- Collaborate closely with engineers, product designers, and product teams to perform experiments and test new ideas.

- Build performant, design-centric, reusable, and usable interfaces that solve complex needs, such as customization possibilities for users, complex data visualizations (graphs, charts, etc.), and delightful components that provide the best platform experience.

- Drive user-defined data modeling and performance, providing users with customization possibilities through reusable building blocks: models, variables, formulas, etc.

- Take operational responsibility for the components you write.

- Work in an environment that supports your individual growth by providing challenging tasks and projects to solve, along with the freedom to acquire new skills during hack time.

- Work with product and operations teams to incorporate customer feedback and constantly improve our product.

- Scale our complex data and calculations platform for a fast-growing number, size, and complexity of clients.

What You’ll Do as a Senior Back End Engineer in the Integrations Team:

• Move fluently across multiple programming languages and ecosystems beyond our core stack (not limited to Python or Django) to read, adapt, and extend integration-specific code such as ERP scripting frameworks (e.g., SuiteScript), 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 (Microsoft Entra ID, Okta, Google Workspace), SAML, and service-to-service authentication. Comfortable managing different token types (access, refresh, JWT, API keys), handling token lifecycles, and applying secure communication protocols (TLS/HTTPS, signed requests, secret management) across all integrations.

• Lead the design and development of Abacum's integrations platform for ingesting, normalizing, and annotating business data.

• Build and scale bidirectional integrations with billing, accounting, ERP, commerce, and HRIS platforms.

• Architect low-code/no-code tools (e.g., connector builder, declarative DSLs, LLM-assisted workflows), and choose between integration strategies (unified API, in-house, contractors) to accelerate integration development and maintenance.

• Ensure integrations are secure, resilient, and performant at scale, supporting high-volume financial and transactional data.

• Collaborate closely with product, design, financial experts, and customers to translate complex, ambiguous workflows into intuitive software experiences.

• Establish technical standards and guide architecture for integrations and data-heavy systems.

Your Experience

• 7+ years of experience, at least 2+ years of which are in integrations roles.

• Strong background in building integrations for data-heavy use cases.

• Hands-on depth in Python and modern backend systems.

• Experience architecting or working on integrations platforms, data platforms, or similar large-scale API ecosystems.

• Curiosity and persistence in tackling ambiguous, high-stakes technical problems like low-code builder design, LLM-assisted workflows, and data enrichment.

• Pragmatic judgment: know when to ship quickly vs. when to invest in foundational architecture.

Benefits

• Competitive compensation including equity package

• Competitive vacation policy

• Medical Insurance

• Learning and Development (L&D) budget

• Access to Meditopia (wellbeing platform)

• Language courses (English / Spanish)

Our Values

Customer Obsession: We share the understanding that Abacum's sole purpose is to create value for customers and relentlessly deploy all creativity and energy to that end.

Audacious Ambition: We dream big and embrace discomfort. We assume risks, make on-time mistakes, and learn how to methodically accomplish our goals.

Good People: We are self-reflective and praise diversity of thought. We don't justify the end with the means and know where to draw the line. We have fun every day.

Tough Love: We truly care for everyone in the team and embrace honest feedback and radical candor as ways to genuinely help each other.