Software Engineer Intern - Crossbeam Ventures (M/F/X)

Neara; Paris; On-site; EUR 12,276 - 17,856; Part time

Job summary

Crossbeam invites a Software Engineer Intern to join the founding team of Pace or Trace in Paris and own real features end to end—from design to production. You’ll build AI agents, integrations, and product features shipped to users within days.

You’ll work with Python, FastAPI, Langgraph, PostgreSQL, Temporal, Pinecone, and Claude-powered agents, gaining rare insight into building a zero-to-one product with a scaling company behind you. Start date Sept 7, 2026 (flexible) for 6 months.

Qualifications

• Strong programming fundamentals, especially in Python.
• Interest in LLMs and AI agents.
• Final-year student or gap year
• Fluent English; based in Paris and able to work from our Paris office.

Responsibilities

• Design and ship features across the stack (Python, FastAPI, Langgraph, PostgreSQL, Temporal, Pinecone).
• Build and improve AI agents powered by Claude and LangGraph.
• Develop integrations with Salesforce, HubSpot, Gmail, Slack, Gong and other tools.
• Use AI tools daily to accelerate delivery.
• Participate in product discussions and have a real voice in what we build and why.

Skills

Python

TypeScript

English

Education

Final-year student

Job description

Software Engineer Intern – Crossbeam Ventures (M/F/X)

Job type: Internship · Department: Engineering · Work type: On‑Site

Paris, Île-de-France, France

About Crossbeam

The highest‑performing go‑to‑market teams have figured out how to turn their partner ecosystem into a revenue engine, and Crossbeam is the platform that makes that possible. Companies use Crossbeam to securely compare CRM data with partners, revealing shared customers, overlapping prospects, and warm paths into deals.

That second‑party data becomes Ecosystem Intelligence – a layer of unique signals and recommendations that helps revenue teams uncover new opportunities, target the right accounts, and win faster. We pioneered the category of ecosystem‑led growth, and now we’re defining what comes next: go‑to‑market powered by AI‑native ecosystem intelligence.

About Crossbeam Ventures

Beyond our core platform, Crossbeam incubates new products built from scratch by small, autonomous teams operating like early‑stage startups inside the company. These ventures move fast, ship daily, and are built AI‑native from day one. Two products are currently in active development:

• Pace – an AI sales performance platform that connects to CRMs, email, Slack, and call‑recording tools to give sales teams AI agents that assess deal health, evaluate forecasts, draft personalized emails, and automate daily workflows – turning scattered go‑to‑market data into decisions and actions.
• Trace – a company intelligence platform that maps what any company runs (tech stack), who they partner with, and who they’re hiring – built natively for AI agents and modern go‑to‑market teams, accessible via API, MCP, and a web app.

You’ll join the Ventures team and contribute to one of these products – Pace or Trace – depending on where your skills and our needs align best.

About the Role

As a Software Engineer Intern, you’ll work directly with the founding team of Pace and Trace and own real features end to end – from design to production. You’ll build AI agents, integrations, and product features that ship to real users within days. You’ll get a rare inside view of what building a product from zero looks like, with the resources and ambition of a scaling company behind you.

Start date: September 7th, 2026 (flexible) – 6 months internship

What you’ll do:

• Design and ship product features across the stack (Python, FastAPI, Langgraph, PostgreSQL, Temporal, Pinecone)
• Build and improve AI agents powered by Claude and LangGraph – reasoning over messy real‑world data to produce useful, reliable output
• Develop integrations with tools sales teams use: Salesforce, HubSpot, Gmail, Slack, and call‑recording platforms like Gong
• Use AI tools (Claude Code and others) every day to amplify what you can build and how fast you can ship
• Take part in product discussions – you’ll have a real voice in what we build and why

What you’ll need:

• Solid programming fundamentals, ideally in Python (TypeScript or another language is fine if you learn fast)
• Genuine curiosity about LLMs and AI agents – you’ve built something with them, even a side project
• Final‑year student or second half of a gap year
• Fluency in English (French is a plus); based in Paris and able to work from our Paris office

You’ll do great if you:

• Take ownership without waiting for permission.
• Ask “what’s actually needed?” instead of defaulting to precedent.
• Use AI as leverage to clarify thinking, improve communication, synthesize information, and accelerate execution.
• Actively seek out and act on feedback to raise your own bar.
• Dig until you understand the real problem, not just the surface request.
• Make those around you more effective.

Hiring process:

• The journey starts with a first interview with the HR Generalist (30 min)
• Then a conversation with Antoine, your future manager, to dive into the role, the team, and your experience (30 min)
• This will be followed by a take‑home case study to assess your practical skills
• Finally, a debrief of your case study with the team (1 hour)

Crossbeam’s core value of Equity sits at the heart of our hiring process, and we’re proud to be building a culture where difference is valued. Applicants from diverse and non‑traditional backgrounds are strongly encouraged to apply. We recruit, employ, train, compensate and promote regardless of race, religion, color, national origin, sex, sexual orientation, gender, disability, age, or veteran status.