Engineering leader who delivers results-focused products to millions, inventing systems and growing the ownership-driven people that ship and sustain them.

19 years in software. 9+ as an EM. Cash App, Amazon, Vistaprint, Microsoft. Exploring Senior EM and Director roles.

Nate Mielnik

Senior EM at Cash App

Tax Server / Engine team

Since Apr 2025

Tenure

19y

software, 9+ as EM

Led teams of

5-30

engineers, managers, product managers, and solutions architects

Mentored

150+

engineers, managers, and product managers

Senior EM

Director of Engineering

Consumer tech, marketplaces, or developer platforms. Remote-first preferred.

Lead with empathy.

Passion over experience.

Extreme candor and transparency.

Measurable, TIME-bound goals.

Fail fast, evolve faster.

  1. Since 2025

    1+ year

    Senior Engineering Manager · Cash App / Block

    Leading the Taxes Product and 8-engineer Tax Engine team. Launched 3 AI products, transformed operational excellence (80% reduction in pages and tech debt), and lifted team output ~60% through AI-tool adoption and innovation.

  2. 2020-2025

    5+ years

    Software Development Manager · Amazon (AWS · Prime Video)

    Led teams of 5 to 14 across three orgs. Launched new RPKI route security system across all AWS routers globally. 0 to 1 creation of Content Experience team, launching new notification platform and A/B testing to 5M+ customers across Mobile, FireTV, and Prime Video devices.

  3. 2013-2020

    7 years

    Senior Manager / Principal Lead Engineer · Vistaprint

    Lead 30-person Design Tech org, and launched greenfield DIY website builder across 20+ engineers, reversing a 3% signup decline into 5% growth. Founded a 4-year mentorship guild that reached 100+ engineers and growing 8 ICs into managers.

  4. 2007-2013

    6+ years

    Senior Software Engineer · Microsoft

    Designed Microsoft Account's two-factor authentication system (500M+ users). Built the enterprise authentication client presented at Microsoft PDC 2008, and authored JS UI framework used across Windows, Xbox, and all Microsoft accounts.

View full résumé →

06 systems

Original systems I invented while leading engineering teams. Several outlived me at the companies that adopted them.

Essays on leadership, coaching, and team building.

Open-Source Development

  • The #1 WYSIWYG Editor on Github

    Digital Tech Days

  • medium-editor: An Open Source Story

    DevCon 2018

  • Semantic Versioning

    Lunch & Learn

  • medium-editor: An Introduction

    Lunch & Learn

Front-End Development

  • How We React

    Digital Tech Days

  • I Read The UI Events Spec

    Lunch & Learn

Authentication

  • Digital SSO-my-god?!

    Digital Tech Days

  • Digital Authentication

    Lunch & Learn

Career Coaching

  • Coaching 101: Why Coaching Is Worth Trying

    Vistaprint Coaching Program

  • Coaching 101: Getting Started

    Vistaprint Coaching Program

  • Coaching 101: Creating Goals

    Vistaprint Coaching Program

Blockchain

  • D is for Dogecoin: An Intro to Blockchain & Consensus

    DevCon 2019

  • From Bitcoin to DogeCoin

    Lunch & Learn

  • An Intro to Bitcoin & Blockchain

    Lunch & Learn

My creative outlets. Some are art, some are music, some are product, all of them keep me sharp.

proofofthought

Proof of Thought LLC. Umbrella for my side ventures.

Reach me on LinkedIn. That's the best place to start a conversation. I'm especially open to Senior EM and Director conversations right now.