> hello, world

Itai Katz

Senior Software Engineer · 15+ years · Berlin

I build the systems that move money. My billing platforms at WeWork invoiced billions of dollars across 40+ countries, and today I'm replacing accountants with tech at Finaloop. Teams call me in when a project is stuck, urgent or uncharted. There's always a way; it usually takes the right compromise.

Get in touch See experience

01 Experience

  1. 2024 – Present

    Senior Software Engineer · Finaloop

    Berlin · Remote

    • Building a data-intensive, AI-powered bookkeeping platform for e-commerce businesses.
    • Led a team of engineers through technical direction, planning and delivery. Ran the codebase's modernization to GraphQL and Postgres, including a complex data migration and verification process.
    • Own invoicing end to end. Built an invoicing system with Stripe-powered online checkout. Over $1M has gone through it, saving e-commerce sellers at least 0.5% of every dollar.

    Node.jsGraphQLPostgreSQLReactStripeClaude Code agents

  2. 2021 – 2024

    Principal Software Engineer · Swimm

    Berlin · Remote

    • The company's "paratrooper": the go-to engineer whenever a project needed a boost, deep research, or was completely new ground. Built a team, ramped up a whole product area, and led research projects on AI integrations, GitHub Apps and billing.
    • Built the Atlassian Compass integration in 2 weeks after a one-month heads-up. Swimm was one of 6 integrations on Atlassian's launch slide, alongside GitHub.
    • Led the adoption of Stigg's pricing platform from the sales calls through the full integration, and was featured in Stigg's customer testimonial.

    Vue.jsNode.jsGCP

  3. 2016 – 2023

    WeWork

    Full Stack Developer → Senior → Staff Software Engineer (New York, then Berlin), then Technology Consultant

    • Built internal platforms for inventory (office occupancy), pricing, rental contracts, billing and invoicing. These systems billed billions of dollars across 40+ countries, every market WeWork operated in at its peak.
    • Led the team behind WeWork's Configure-Price-Quote products. Re-architected the commitment-term logic, which let WeWork increase average commitment terms by 1000%.
    • Re-architected the contracts system, cutting errors and manual support work by 90% while scaling to hundreds of thousands of agreements.
    • Built an inventory search that pulled data from many systems into a single source of truth, shortening the sales cycle.
    • Returned as a consultant to write the spec and design for a year-long, multi-million-dollar Salesforce CPQ migration with full feature parity. When cost cuts cancelled the project, the original system kept running.

    Ruby on RailsJavaReactPostgreSQLKubernetesElasticsearch

  4. 2015 – 2016

    Full Stack Engineer · Any.do

    Tel Aviv

    • Led the team behind the Web, Mac and Chrome apps and the Chrome extension of a to-do app with over 1M monthly active users.
    • Ran an A/B test of pricing plans that increased revenue by 33%.

    JavaScriptBackbone.jsPythonNode.js

  5. 2010 – 2016

    Teaching

    • Junior Faculty, Operating Systems · Tel Aviv University · reviewed hundreds of code exercises a week · Teaching Assistant Honor, 2013
    • Graduate Teaching Assistant, Programming Workshop (C / Unix) · IDC Herzliya
  6. 2008 – 2009

    Full Stack Engineer · Clementina / Teewe

    Built an online game show with a live host. It was demoed and piloted with major US and Israeli TV production companies.

02 How I work

Goals over orders

I do my best work toward a clear target: more sign-ups, less churn, more upsell. Not rebuilding things for their own sake.

No "impossible"

People come to me for the most efficient, minimal way to get something done. There's always a path, plus an honest view of the trade-off.

Experience over stack

Code is code. What matters is designing systems that last, and remembering what failed before and why.

Today: Node.js, GraphQL, PostgreSQL, React, Claude Code. Before: Ruby on Rails, Java, Python, Vue.js, Kafka, Kubernetes, Elasticsearch, GCP, C.

03 Education & beyond

04 Contact

Open to conversations about engineering leadership, founding-team and senior IC roles, and working with investors. The best way to reach me is on LinkedIn.

LinkedIn