Software Engineer - API & Integration (Langflow)

IBM

Software Engineering

Markham, ON, Canada

Posted on Jul 19, 2025

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Introduction

Langflow is a Python-based visual editor for building AI and agentic applications. Our open-source platform makes it easy for developers to compose, orchestrate, and debug complex LLM-powered systems. We’re looking for an engineer who’s excited to design and scale the APIs that power Langflow — and extend its reach through integrations, plugins, and external tooling.

Your role and responsibilities

What you'll do:

* Design, implement, and evolve the Langflow API to support creation, execution, and introspection of AI workflows.

* Build the foundations for third-party integrations, including plugin APIs, webhooks, and external tool interfaces.

* Collaborate with frontend and platform engineers to ensure clean, well-documented interfaces across the product.

* Own the developer experience for Langflow’s API consumers — internal and external — with a focus on consistency, discoverability, and security.

* Contribute to our open-source SDKs, CLI tools, and infrastructure to make it easy to embed Langflow in other systems.

Required education

Bachelor's Degree

Preferred education

Master's Degree

Required technical and professional expertise

* 1-3 years of relevant experience

* Strong backend development skills with Python, including experience designing clean, well-structured RESTful APIs.

* Familiarity with FastAPI (or similar Python frameworks), OpenAPI, and API versioning strategies.

* Experience building integrations or extension systems (e.g. plugin architectures, webhooks, OAuth flows, etc.).

* Understanding of async programming, task queues, and long-running background jobs.

* Thoughtful approach to API design: you consider developer ergonomics, edge cases, and backward compatibility.

* Comfortable writing tests, profiling performance, and working with observability tooling.

Preferred technical and professional experience

Bonus: experience working on dev platforms, low-code systems, or orchestration frameworks.

ABOUT BUSINESS UNIT

IBM Software infuses core business operations with intelligence—from machine learning to generative AI—to help make organizations more responsive, productive, and resilient. IBM Software helps clients put AI into action now to create real value with trust, speed, and confidence across digital labor, IT automation, application modernization, security, and sustainability. Critical to this is the ability to make use of all data, because AI is only as good as the data that fuels it. In most organizations data is spread across multiple clouds, on premises, in private datacenters, and at the edge. IBM’s AI and data platform scales and accelerates the impact of AI with trusted data, and provides leading capabilities to train, tune and deploy AI across business. IBM’s hybrid cloud platform is one of the most comprehensive and consistent approach to development, security, and operations across hybrid environments—a flexible foundation for leveraging data, wherever it resides, to extend AI deep into a business.

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ABOUT IBM

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At IBM, we pride ourselves on being an early adopter of artificial intelligence, quantum computing and blockchain. Now it’s time for you to join us on our journey to being a responsible technology innovator and a force for good in the world.

IBM is proud to be an equal-opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, gender, gender identity or expression, sexual orientation, national origin, caste, genetics, pregnancy, disability, neurodivergence, age, veteran status, or other characteristics. IBM is also committed to compliance with all fair employment practices regarding citizenship and immigration status.

OTHER RELEVANT JOB DETAILS

Must have the ability to work in Canada without sponsorship.

This role will involve working with technology that is covered by Export Regulations sanctions. If you are a Foreign National from any of the following US sanctioned countries (Cuba, Iran, North Korea, Syria, and the Crimea, Luhansk, Donetsk, Kherson, and Zaporizhia regions of Ukraine) on a work permit, you are not eligible for employment in this position.