---
title: 'Foundry Interface Engineer at Block'
canonical: 'https://feeny.ai/job/foundry-interface-engineer-block-singapore-51a0hcb7papq'
type: 'job'
last_seen: '2026-10-12'
---

# Foundry Interface Engineer at Block

- **Company:** Block
- **Location:** Singapore
- **Posted:** 2026-10-08
- **Last confirmed live:** 2026-10-12
- **Apply:** http://block.xyz/careers/jobs/5445289008?gh_jid=5445289008

## Job description

Proto is accelerating the world's transition to an open economy with products that increase access and independence for everyone. We're building Bitkey, a simple and safe self-custody bitcoin wallet that will put customers in control, as well as hardware and software that will help decentralize bitcoin mining and enable new and innovative use cases for bitcoin mining. We're developing these products in the open - you can read more about them at bitkey.build and mining.build. Within Proto, our Bitcoin Products team delivers the product and go-to-market strategy, software, firmware, and custom silicon needed to make Bitkey and our ambitious mining initiatives a reality. Come build the future of money with us!

## The Role

The Foundry Interface Engineer will engage with Foundry partners/third-party vendors as well as internal teams to continuously improve the design of our ASICs. This work will include partnering with OSAT to continuously monitor and review production wafer test data, and work with standard cell level circuit designers to analyze the results. Based on the analysis the engineer will make requests to the foundry for process fine tuning.

You Will

- Review and assess Foundry silicon data against SPICE/design goals and compile SPICE to Silicon gap analysis. Drive foundry partners on CIPs to improve foundry process to meet technology entitlement and product goals.
- Work with foundry to identify potential device parameter changes to enable efficient low-voltage operation
- Work closely with circuit designers to determine what device improvements could improve circuit performance and energy efficiency
- Engage with Foundry partners/third-party vendors to manage foundry PDK/DK and design library collaterals
- Guide internal IP/design teams on appropriate usage of technology attributes/offerings in accordance with product requirements (e.g., performance, power, area, and cost).
- Collaborate with internal third-party infrastructure, customization, test-chip, methodology, and packaging and product test engineering teams for seamless execution of product bring-up and productization.
- Work with test engineers to analyze and validate production wafer data
- Contribute to binning strategy to maximize parametric yield

You Have

- 10 + years of post-education experience in FAB/Fabless environments, technology definition and bring-up, device/process architecture, and NPI
- Experience with foundry design kit, SPICE, DR/DRC evaluation, SPICE to Si assessment
- Experience with advanced node device physics (e.g. FinFET/GAA), backside power, product design phases
- Experience with product KPIs, DTCO, and parametric, DLY/PLY analysis/gap closure
- Understanding of low power design techniques (e.g., Vmin reduction, power gating, multi-voltage design, chip power, clock network and optimization)
- Understanding of layout effects and impact to circuit design

Preferred:

- Master's degree or PhD in Electrical Engineering, Physics, or other related Engineering field with emphasis on semiconductor materials/devices and device physics (not a substitute for professional experience)
- Production test development experience
- Familiar with advanced FinFET technology nodes (3nm and 2nm)
- Familiar with PDK and device models
- Previous work experience at semiconductor foundries
- Familiar with standard cell design and layout

We’re working to build a more inclusive economy where our customers have equal access to opportunity, and we strive to live by these same values in building our workplace. Block is a proud equal opportunity employer. We work hard to evaluate all employees and job applicants consistently, based solely on the core competencies required of the role at hand, and without regard to any legally protected class.

We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations to disabled applicants throughout the recruitment process. We encourage applicants to share any needed accommodations with their recruiter, who will treat these requests as confidentially as possible. Want to learn more about what we’re doing to build an inclusive workplace? Check out our [Inclusion & Diversity page](https://block.xyz/news/inclusion)

Application Guidelines

Candidates may submit up to 9 active applications within a 60-day period. Reapplications to the same role are accepted 90 days after a previous application has been reviewed.

Use of AI in Our Hiring Process

We may use automated AI tools to evaluate job applications for efficiency and consistency. These tools comply with local regulations, including bias audits, and we handle all personal data in accordance with state and local privacy laws.

Contact us [here](https://privacy.block.xyz/privacyportal/form) with hiring practice or data usage questions.

Every benefit we offer is designed with one goal: empowering you to do the best work of your career while building the life you want. Remote work, medical insurance, flexible time off, retirement savings plans, and modern family planning are just some of our offering. [Check out our other benefits at Block.](https://block.xyz/employee-benefits)

Block, Inc. (NYSE: XYZ) builds technology to increase access to the global economy. Each of our brands unlocks different aspects of the economy for more people. Square makes commerce and financial services accessible to sellers. Cash App is the easy way to spend, send, and store money. Afterpay is transforming the way customers manage their spending over time. TIDAL is a music platform that empowers artists to thrive as entrepreneurs. Bitkey is a simple self-custody wallet built for bitcoin. Proto is a suite of bitcoin mining products and services. Together, we’re helping build a financial system that is open to everyone.

[Privacy Policy](https://block.xyz/en/legal/applicant-privacy-notice)

## About Block

## Company Overview
- **One-liner**: Block, Inc. builds technology for economic empowerment, providing financial services and tools for merchants and consumers through brands like Square, Cash App, Afterpay, Tidal, Bitkey, and Proto.
- **Entity Type**: Public (NYSE: SQ)
- **Headquarters**: Oakland, California, United States
- **Founded**: 2009
- **Founders**: Jack Dorsey, Jim McKelvey, Tristan O’Tierney

## Core Business
- **Primary industry**: Financial services, payments, and financial technology (fintech)
- **Target customers**: B2B (merchants, sellers of all sizes) and B2C (consumers, music listeners, bitcoin users)
- **Mission**: To build simple, powerful tools that make progress toward an economy that’s truly open to all — helping create a financial system that is open to everyone. [block.xyz](https://block.xyz/)

## Products & Services
- **Square**: Point-of-sale system and commerce platform that enables sellers to accept card payments, manage operations (bookings, e-commerce, inventory, payroll, banking), and access business loans. [linkedin.com/company/joinblock](https://www.linkedin.com/company/joinblock)
- **Cash App**: Digital wallet for consumers to send, receive, save, or borrow money; access a debit card; invest in stocks and bitcoin; and file taxes. [linkedin.com/company/joinblock](https://www.linkedin.com/company/joinblock)
- **Afterpay**: Buy now, pay later service that lets customers manage spending over time. [block.xyz](https://block.xyz/)
- **Tidal**: Music streaming platform that empowers artists to thrive as entrepreneurs. [block.xyz](https://block.xyz/)
- **Bitkey**: Simple self-custody bitcoin wallet. [block.xyz](https://block.xyz/)
- **Proto**: Suite of bitcoin mining products and services. [block.xyz](https://block.xyz/)

## Market Standing
- **Valuation/Market Cap**: $96.3 billion (as of 2025/2026, per LinkedIn). [linkedin.com/company/joinblock](https://www.linkedin.com/company/joinblock)
- **Key Metric (Public)**: Annual revenue of $24.2 billion (latest fiscal year). [linkedin.com/company/joinblock](https://www.linkedin.com/company/joinblock)
- **Notable Investors/Partners**: Jack Dorsey (founder, chair, CEO) owns ~10% of the company; other major institutional investors. Key partners include Amazon, Meta, Google (as talent sources). [linkedin.com/company/joinblock](https://www.linkedin.com/company/joinblock)
- **Growth Signals**: Serves 57 million users and 4 million sellers, processing $241 billion in payments annually. Operates in 34 countries. Headcount of 3,223 (though down 25.4% YoY). Active job postings increased 614% quarter-over-quarter (50 open roles). [linkedin.com/company/joinblock](https://www.linkedin.com/company/joinblock)

## Competitive Advantages
- **Ecosystem moat**: Multiple interconnected brands (Square, Cash App, Afterpay, Tidal, Bitkey, Proto) that cross-sell and deepen user engagement across payments, banking, music, and bitcoin.
- **Market leadership**: Dominant U.S. point-of-sale market share and strong consumer adoption of Cash App.
- **Bitcoin & crypto focus**: Early and deep integration of bitcoin (Bitkey wallet, Proto mining, Cash App crypto trading) differentiates Block from traditional fintechs.
- **Distributed work culture**: Allows global talent acquisition and flexible work arrangements that reduce real estate costs and increase employee satisfaction. [block.xyz/employee-benefits](https://block.xyz/employee-benefits)

## Strategic Focus
- Expanding the bitcoin ecosystem through self-custody (Bitkey) and mining infrastructure (Proto).
- Deepening financial inclusion with Cash App (banking, lending, investing) and Afterpay (credit alternatives).
- Growing the Square merchant platform internationally and into larger enterprise accounts.
- Leveraging AI in hiring and operations to improve efficiency and reduce bias. [block.xyz/careers/our-ai-hiring-principles](https://block.xyz/careers/our-ai-hiring-principles)

## Why Work Here
- **Culture**: Block emphasizes a “distributed work” model — employees choose where they work (home, office, hybrid) unless a role requires specific geography. Up to 45 days of international work flexibility across 150+ countries. [block.xyz/employee-benefits](https://block.xyz/employee-benefits)
- **Benefits**: Competitive pay, equity (Employee Stock Purchase Plan at 15% discount), matching 401(k), flexible PTO, comprehensive health/wellness (medical, dental, vision, mental health support), family leave, and family planning support. [block.xyz/employee-benefits](https://block.xyz/employee-benefits)
- **Engineering culture**: AI is used to augment hiring (not replace judgment). Strong emphasis on open source, bitcoin, and building for economic empowerment. Teams work across Square, Cash App, Afterpay, Tidal, Bitkey, and Proto — offering broad career mobility. [block.xyz/careers/our-ai-hiring-principles](https://block.xyz/careers/our-ai-hiring-principles)
- **Remote/Hybrid**: Fully distributed; offices available in Oakland, San Francisco, New York, Melbourne, London, Toronto, and more. [linkedin.com/company/joinblock](https://www.linkedin.com/company/joinblock)
- **Perks**: Employee stock ownership, wellness stipends, career growth programs across the ecosystem.

## Sources
1. [block.xyz](https://block.xyz/)
2. [block.xyz - Careers](https://block.xyz/careers/jobs)
3. [block.xyz - Employee Benefits](https://block.xyz/employee-benefits)
4. [block.xyz - AI Hiring Principles](https://block.xyz/careers/our-ai-hiring-principles)
5. [LinkedIn - Block](https://www.linkedin.com/company/joinblock)

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