---
title: 'Billing Engineer at E2B'
canonical: 'https://feeny.ai/job/billing-engineer-e2b-prague-zj9t3htcfd7f'
type: 'job'
last_seen: '2026-09-21'
---

# Billing Engineer at E2B

- **Company:** E2B
- **Location:** Prague, Czech Republic
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-09-21
- **Last confirmed live:** 2026-09-21
- **Apply:** https://jobs.ashbyhq.com/e2b/efc5fc81-83b7-40f6-8c00-a5a8bf508fe5

## Job description

## About E2B

E2B is a fast-growing Series A startup with over $37M in funding and 8-figure revenue. We are building the Agent Cloud and power the infrastructure behind AI labs and some of the most widely used consumer and enterprise agents, including Manus, Genspark, Lindy, Groq, and Artificial Analysis. Our team includes original authors of Firecracker, the AWS microVM technology powering Lambda, along with alumni of Cognition, JetBrains, Zapier, and Wish.

## About the role

Your job is to own billing at E2B — everything that touches how we charge customers, collect revenue, and capture the data behind it. The metering pipeline, the Stripe integration, invoicing, collections, and the billing surfaces developers see in the dashboard. Your code will be responsible for collecting data metrics, creating and sending invoices and reconciliation of payments for our customers across the globe. We have a billing system. Your job is to take it over end to end and redesign it. Engineering, finance, and customers all depend on the system and the data it produces, and you'll work across all three. When a customer asks why their invoice looks the way it does, you're the person who can answer. Responsibilities include:

- Owning the services behind billing end-to-end — usage metering, charge calculation, invoicing, payments, and the data models underneath them
- Owning the Stripe integration end-to-end: subscriptions, Billing Meters, and enterprise invoicing edge cases
- Building billing automation: failed-payment recovery, collections, proration and plan changes, credits, refunds, and disputes
- Working with engineers across Core, Platform, and Dashboard to get the data billing depends on, and defining the contracts for it
- Partnering with finance on reconciliation, revenue reporting, and audit-readiness
- Making architectural decisions around observability, testing, and security

## What we're looking for

- Understanding of metric collection, metered usage, Pay-as-you-go, billing cycles - being able to understand finance requirements and translate them into well tested code
- Backend engineer with 5+ years billing systems experience, with deep expertise in Go
- Strong API design — REST/RPC, contracts and versioning
- Solid with PostgreSQL: schema design, query optimization, migrations, and reasoning about data at scale
- Backend fundamentals: authentication/authorization, server-side performance, and building real-time data flows (WebSockets, SSE)
- Experienced with charging logic, collections, billing automation, and billing-related data flows
- Comfortable with complex invoicing, SKUs, usage-/contract-based billing, and third-party payment platforms
- Strong cross-functional communication skills, especially with finance
- Comfortable owning a system end-to-end with high autonomy
- Able to work through ambiguity and figure things out independently

What it’s like to work at E2B We’re a fast-growing startup with in-person (4 days on-site, 1 day WFH) offices in San Francisco and Prague, Czech Republic. We already generate 8-figure revenue and work directly with top-tier AI companies like Manus, Genspark, Lindy, Groq, Artificial Analysis and other exciting teams pushing the frontier of AI. We offer healthcare, vision, and dental insurance, unlimited PTO, 401k, and a variety of perks for in-office employees.

## About E2B

## Company Overview
- **One-liner**: E2B provides open-source, secure sandboxed cloud infrastructure for AI agents to execute code, access tools, and run autonomously.
- **Entity Type**: Private (Series A)
- **Headquarters**: San Francisco, California, United States (also office in Prague, Czechia)
- **Founded**: 2023
- **Founders**: Vasek Mlejnsky (Co-Founder & CEO), Tomas Valenta (Co-Founder & CTO)

## Core Business
- **Primary Industry**: Cloud infrastructure for AI agents, secure code execution, developer tools
- **Target Customers**: B2B – Enterprise (Fortune 100), AI startups, LLM providers, and developers building agentic workflows
- **Mission / Purpose**: “Build and run AI agents with confidence.” – providing enterprise-grade, open-source environments for agents.

## Products & Services
- **E2B Sandboxes** (Cloud): Isolated microVM environments (powered by Firecracker) that start in under 200 ms, support any LLM, and run for up to 24 hours. Used for code execution, data analysis, deep research, reinforcement learning, and computer use agents. Available via BYOC, on-prem, or self-hosted on AWS, GCP, Azure.
- **Code Interpreter SDK** (SaaS/API): JavaScript and Python SDKs to run AI-generated code inside sandboxes (`@e2b/code-interpreter`).
- **Secure MCPs** (API): Infrastructure for Model Context Protocols with full isolation.
- **Desktop Sandbox** (Feature): Provides virtual desktop environments for LLMs (computer use agents).

## Market Standing
- **Valuation / Market Cap**: Not publicly available (private company)
- **Key Metric**: Total Funding – $35 M (Series A $21 M, Seed $11.5 M, Pre-seed $2.5 M)
- **Notable Investors / Partners**:  
  - **Lead Investors**: Insight Partners (Series A), Decibel Partners (Seed), KAYA (Pre-seed)  
  - **Partners**: Hugging Face, Manus (case studies); works with OpenAI, Anthropic, Meta Llama, Mistral, and custom models.
- **Growth Signals**:  
  - Headcount grew 169 % YoY to 20 employees (LinkedIn)  
  - 7 M+ monthly downloads, 1 B+ sandboxes started  
  - 94 % of Fortune 100 companies use E2B (self-reported)  
  - Open-source GitHub repo has 12,720 stars, 527 releases, active contributor community  
  - Traffic: 196,886 monthly visits (+42 % YoY)

## Competitive Advantages
- **Open‑source & LLM‑agnostic**: Works with any model (OpenAI, Llama, Anthropic, Mistral, custom).
- **Speed & Isolation**: Sandboxes start in <200 ms; microVM isolation (Firecracker) for untrusted code.
- **Enterprise‑grade**: BYOC, on‑prem, VPC deployment, SAML/Okta SSO, GDPR/enterprise security features.
- **Deep Integrations**: Supports Python, JavaScript, TypeScript, Go, Ruby, C++, and most Linux packages.
- **Large Community**: 12.7 K GitHub stars, active Discord, cookbook with example workflows.

## Strategic Focus
- **Scale Enterprise Adoption**: Already serving Fortune 100 clients, aims to become the default cloud for AI agents.
- **Product Expansion**: Adding reinforcement learning, deep research agents, and longer sessions (up to 24 h).
- **Talent Growth**: Actively hiring 16+ roles (Product Engineer, SRE, Distributed Systems, DevRel, etc.) to accelerate product development.

## Why Work Here
- **High‑impact mission**: Build the foundational infrastructure for the next wave of AI – used by the largest tech companies and open‑source community.
- **Strong engineering culture**: Cross‑disciplinary team (distributed systems, security, AI) with an open‑source ethos; tech stack includes Python, TypeScript, Go, Kubernetes, Docker, Terraform, Firecracker, and major cloud providers.
- **Growth trajectory**: 169 % headcount growth, $35 M in funding, and a clear enterprise traction story.
- **Location & flexibility**: Offices in San Francisco (HQ) and Prague, Czechia. Remote/hybrid not explicitly stated but team operates across 5 countries.
- **Visible open‑source work**: GitHub repository with 12.7 K stars allows engineers to contribute publicly and build reputation.

## Sources
1. [e2b.dev](https://e2b.dev/)
2. [e2b.dev/careers](https://www.e2b.dev/careers)
3. [linkedin.com/company/e2b-dev](https://www.linkedin.com/company/e2b-dev)
4. [github.com/e2b-dev/e2b](https://github.com/e2b-dev/e2b)
5. [tracxn.com](https://tracxn.com/d/companies/e2b/__U7C82j6Wk3VH-rgW0n4LFnUqqq-LuBw6rnIcnLGz2yU)

## Other roles at E2B

- [Technical Copywriter](https://feeny.ai/job/technical-copywriter-e2b-san-francisco-ssw0phegqcyz) — San Francisco, CA
- [Community Growth Manager](https://feeny.ai/job/community-growth-manager-e2b-san-francisco-mn9gr036axce) — San Francisco, CA
- [Content Marketing Lead](https://feeny.ai/job/content-marketing-lead-e2b-san-francisco-6hefb4wh2csd) — San Francisco, CA
- [Engineering Team Lead, Platform](https://feeny.ai/job/engineering-team-lead-platform-e2b-prague-306jybs5caqr) — Prague, Czech Republic
- [Product Engineer - Backend Developer](https://feeny.ai/job/product-engineer-backend-developer-e2b-prague-6a4j1bpy60wh) — Prague, Czech Republic
- [Product Engineer - Backend Developer](https://feeny.ai/job/product-engineer-backend-developer-e2b-san-francisco-zks5f2vz66tr) — San Francisco, CA
- [Platform Engineer](https://feeny.ai/job/platform-engineer-e2b-prague-394epn2ng4xj) — Prague, Czech Republic
- [Technical Recruiter](https://feeny.ai/job/technical-recruiter-e2b-san-francisco-jbj831szarvq) — San Francisco, CA
- [Business Operations](https://feeny.ai/job/business-operations-e2b-san-francisco-x91a6jab142t) — San Francisco, CA
- [Platform Engineer](https://feeny.ai/job/platform-engineer-e2b-san-francisco-qvdmdpg4510q) — San Francisco, CA