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

We are looking for an ASIC Validation Engineer to help bridge the gap between custom mining silicon design and real-world operation. In this highly hands-on, lab-focused role, you'll work closely with ASIC designers and system engineers to debug issues, build test infrastructure, and generate the data needed to enable rapid design iteration and system-level development.

You Will:

• Bring up new silicon on bench platforms, evaluation boards, and system hardware
• Debug issues across ASIC, board, firmware, and system interactions
• Develop bench tests, scripts, and tools to exercise silicon features and collect data
• Build and maintain test setups (lab automation, instrumentation, fixtures, scripts)
• Partner with ASIC designers to validate functionality and root-cause failures
• Work with system engineers to ensure silicon performs correctly in target system environments, including mining systems
• Generate and analyze data to support design decisions, characterization, and bring-up
• Create lightweight, reusable test workflows and documentation for the broader team
• Support early manufacturing efforts with practical validation and debug, as needed
• Travel up to 20% to the labs in Oakland, CA or Toronto, Canada

You Have:

• Bachelor's degree in Electrical Engineering or related field
• 4+ years of experience in silicon validation, hardware test, or related roles
• Strong hands-on experience in a lab environment (bench bring-up, debugging, instrumentation)
• Solid understanding of digital systems and basic analog concepts
• Experience writing scripts or tools (Python preferred) for test and data analysis
• Comfortable debugging issues that span multiple layers (ASIC ↔ board ↔ system)
• Clear communication skills and ability to work closely with cross-functional teams

Preferred:

• Experience with ASIC or FPGA bring-up and validation
• Familiarity with common interfaces (SPI, I2C, JTAG, UART, etc.)
• Experience using lab equipment (oscilloscopes, logic analyzers, power supplies, etc.)
• Exposure to high-performance, power-dense systems (e.g., mining ASICs, accelerators, or similar)
• Experience building test automation or internal tooling
• Familiarity with data analysis and visualization

Nice to Have

• Experience working with early silicon / first bring-up environments
• Exposure to manufacturing test or ATE
• Experience working on systems with tight power, thermal, and performance constraints

It all started with an idea at Block in 2013. Initially built to take the pain out of peer-to-peer payments, Cash App has gone from a simple product with a single purpose to a dynamic ecosystem, developing unique financial products, including Afterpay/Clearpay, to provide a better way to send, spend, invest, borrow and save to our 50+ million monthly active customers. We want to redefine the world's relationship with money to make it more relatable, instantly available, and universally accessible.

Today, Cash App has thousands of employees working globally across office and remote locations, with a culture geared toward innovation, collaboration and impact. We've been a distributed team since day one, and many of our roles can be done remotely from the countries where Cash App operates. No matter the location, we tailor our experience to ensure our employees are creative, productive, and happy.

The Role

At Cash App, we strive to build the best consumer financial products in the world. The Cash App Banking team aspires to make Cash App the primary place for our customers to store, manage, and move money across all their banking needs. We achieve this by providing various offerings including a range of deposit and transfer options, savings and automation tools, and a suite of benefits for Banking customers, all while ensuring a fast and reliable experience.

As a software engineer on the Cash App Banking server engineering team, you will design, develop, and deliver new banking experiences, through close collaboration across teams and disciplines. The things that you build will create significant impact at scale and will fundamentally change the consumer banking landscape as we know it today.

You Will

• Partner closely with your team to design, develop, test, ship, and maintain customer-facing features
• Participate in critical technical discussions and play an active role as a reviewer of design documents and code changes
• Design and implement systems to work within our microservice and event-driven architectures
• Hold your teammates and yourself to high engineering standards
• Apply an AI-first mindset using tools to improve development speed and quality, continuously experimenting with emerging approaches

You Have

• 5+ years of software development or equivalent experience
• Drive to find flaws in a system with many moving parts and take whatever steps are necessary to fix them
• A growth mindset and an appetite in solving open-ended and ambiguous problems
• Strong communication and collaboration skills
• Bachelor's Degree or Diploma in Computer Science, Computer Engineering, Software Engineering, or equivalent experience

Technologies We Use and Teach

• Java, Kotlin
• AWS
• HTTP, JSON, gRPC, Protocol Buffers
• OkHttp, Jetty, JUnit, Guice
• Hibernate, MySQL, DynamoDB
• Kafka, events, microservices
• DataDog, Prometheus, SignalFx

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 an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We also consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis.We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations throughout the recruitment process. If you require an accommodation, let your recruiter know.  Want to learn more about what we’re doing to build an inclusive workplace? Check out our Inclusion & Diversity page.

It all started with an idea at Block in 2013. Initially built to take the pain out of peer-to-peer payments, Cash App has gone from a simple product with a single purpose to a dynamic ecosystem, developing unique financial products, including Afterpay/Clearpay, to provide a better way to send, spend, invest, borrow and save to our 50+ million monthly active customers. We want to redefine the world's relationship with money to make it more relatable, instantly available, and universally accessible.

Today, Cash App has thousands of employees working globally across office and remote locations, with a culture geared toward innovation, collaboration and impact. We've been a distributed team since day one, and many of our roles can be done remotely from the countries where Cash App operates. No matter the location, we tailor our experience to ensure our employees are creative, productive, and happy.

The Role

At Cash App, we strive to build the best consumer financial products in the world. The Cash App Banking team aspires to make Cash App the primary place for our customers to store, manage, and move money across all their banking needs. We achieve this by providing various offerings including a range of deposit and transfer options, savings and automation tools, and a suite of benefits for Banking customers, all while ensuring a fast and reliable experience.

As a staff software engineer on the Cash App Banking server engineering team, you will help lead the overall technical strategy of the team, through close collaboration across teams and disciplines. In addition, you'll drive cross-cutting architectural decisions and infrastructure improvements to make our systems more robust and scalable. You will also foster the growth of aspiring engineers to expand their scope of influence beyond their immediate teams. The things that you build will create significant impact at scale and will fundamentally change the consumer banking landscape as we know it today.

You Will

• Partner closely with product managers, designers, engineers, and business leads to develop, communicate and execute technical strategies that benefit the Banking organization
• Play a critical role in influencing leaders across the organization and company to drive consistent, sound and efficient technical decisions
• Stay close to the details of systems that power our products by directly contributing to technical designs and staying hands on with code contributions
• Hold your teammates and yourself to high engineering standards
• Leverage your experience and knowledge to grow your teammates' technical breadth and depth through direct coaching and mentoring
• Apply an AI-first mindset in your everyday work, raising the bar of AI application across the team by staying connected to efforts across the organization

You Have

• 12+ years of software development or equivalent experience
• 3+ years of experience leading large scale features, which includes planning, managing and executing on the delivery projects in a timely manner while maintaining a high quality bar
• Drive and experience in identifying, aligning and landing globally optimal solutions in a system with many moving parts
• The ability to design and build creative solutions to complex problems
• A strong track record in helping other engineers grow
• Bachelor's Degree or Diploma in Computer Science, Computer Engineering, Software Engineering, or equivalent experience

Technologies We Use and Teach

• Java, Kotlin
• AWS
• HTTP, JSON, gRPC, Protocol Buffers
• OkHttp, Jetty, JUnit, Guice
• Hibernate, Aurora, MySQL, DynamoDB, Redis
• Kafka, event-driven architecture, microservices
• DataDog
• Buildkite, Gradle

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 an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We also consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis.We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations throughout the recruitment process. If you require an accommodation, let your recruiter know.  Want to learn more about what we’re doing to build an inclusive workplace? Check out our Inclusion & Diversity page.

It all started with an idea at Block in 2013. Initially built to take the pain out of peer-to-peer payments, Cash App has gone from a simple product with a single purpose to a dynamic ecosystem, developing unique financial products, including Afterpay/Clearpay, to provide a better way to send, spend, invest, borrow and save to our 50+ million monthly active customers. We want to redefine the world's relationship with money to make it more relatable, instantly available, and universally accessible.

Today, Cash App has thousands of employees working globally across office and remote locations, with a culture geared toward innovation, collaboration and impact. We've been a distributed team since day one, and many of our roles can be done remotely from the countries where Cash App operates. No matter the location, we tailor our experience to ensure our employees are creative, productive, and happy.

The Role

At Cash App, we strive to build the best consumer financial products in the world. The Cash App Banking team aspires to make Cash App the primary place for our customers to store, manage, and move money across all their banking needs. We achieve this by providing various offerings including a range of deposit and transfer options, savings and automation tools, and a suite of benefits for Banking customers, all while ensuring a fast and reliable experience.

As a senior software engineer on the Cash App Banking server engineering team, you will lead the technical design, execution, and delivery of new banking experiences through close collaboration across teams and disciplines. In addition, you'll drive architectural decisions and infrastructure improvements to make our systems more robust and scalable. The things that you build will create significant impact at scale and will fundamentally change the consumer banking landscape as we know it today.

You Will

• Partner closely with product managers, designers, engineers, and business leads to scope, plan, design, and build new features as well as maintain existing functionality of banking features
• Lead and participate in critical technical, design, and product discussions within the team and with leaders across the organization
• Design systems to work within our microservice and event-driven architectures
• Hold your teammates and yourself to high engineering standards
• Leverage your experience and knowledge to grow your teammates' technical breadth and depth through direct coaching and mentoring
• Apply an AI-first mindset in your everyday work, raising the bar of AI application on our team

You Have

• 8+ years of software development or equivalent experience
• 1+ years of experience leading large scale features, which includes planning, managing and executing on the delivery projects in a timely manner while maintaining a high quality bar
• Drive to find flaws in a system with many moving parts and take whatever steps are necessary to fix them
• The ability to design and build creative solutions to complex problems
• A strong desire to perform and grow as an engineer
• Bachelor's Degree or Diploma in Computer Science, Computer Engineering, Software Engineering, or equivalent experience

Technologies We Use and Teach

• Java, Kotlin
• AWS
• HTTP, JSON, gRPC, Protocol Buffers
• OkHttp, Jetty, JUnit, Guice
• Hibernate, MySQL, DynamoDB
• Kafka, events, microservices
• DataDog, Prometheus, SignalFx

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 an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We also consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis.We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations throughout the recruitment process. If you require an accommodation, let your recruiter know.  Want to learn more about what we’re doing to build an inclusive workplace? Check out our Inclusion & Diversity page.

It all started with an idea at Block in 2013. Initially built to take the pain out of peer-to-peer payments, Cash App has gone from a simple product with a single purpose to a dynamic ecosystem, developing unique financial products, including Afterpay/Clearpay, to provide a better way to send, spend, invest, borrow and save to our 50+ million monthly active customers. We want to redefine the world's relationship with money to make it more relatable, instantly available, and universally accessible.

Today, Cash App has thousands of employees working globally across office and remote locations, with a culture geared toward innovation, collaboration and impact. We've been a distributed team since day one, and many of our roles can be done remotely from the countries where Cash App operates. No matter the location, we tailor our experience to ensure our employees are creative, productive, and happy.

The Role

Cash App's mission is to make money instantly available and universally accessible - all the products and features we've released in the app are based on those principles. Lending is one of the newest Cash App products and we're looking for a Software Engineer to join this team and help deliver on our vision of economic empowerment.

Lending offers Cash App and Afterpay users low-friction access to credit without prohibitive repayment terms, and the Lending Engineering team is focused on building the complex systems and tooling to support access and availability.The Lending Engineering team focuses on building the products and platforms that help deliver this access and credit to our customers at scale. We're looking for people who are as excited about our mission as they are about the technical challenges we have.

You Will

• Partner closely with credit risk, legal & compliance, product managers and other engineers to take the Lending capability to the next level.
• Lead or contribute to projects from hypothesis to production capability, ensuring ownership of the output quality.
• Build financial primitives by acting as an IC or lead on atomic, composable, API-level building blocks that serve the Block's intelligence layer.
• Take a developer-centric approach to designing and building clean APIs, optimizing strictly for uptime, latency, regulatory compliance, and cost-per-transaction.
• Experiment with emerging approaches and support team capability by sharing learnings and providing feedback.
• Operate and manage existing Cash services.
• Make recommendations to improve the team and wider Engineering practices.
• Help interview candidates, organize external recruiting/networking activities, and contribute to the broader tech and open-source communities.

You Have

• Embrace an AI-first mentality. Leverage AI to augment your knowledge and capability in navigating development in complex systems with confidence.
• Familiar with agentic engineering.
• 5+ years working on complex systems and delivering quality software, with clear expertise developed in one or more technical areas.
• Curiosity that pushes you to find flaws in complex systems and take whatever steps are necessary to fix them.
• Resilience to persevere in complex situations across multiple axes: e.g., scale, uncertainty, and interconnectedness.
• Self-directed and comfortable with ambiguity, with a willingness to publish your reasoning and be wrong publicly—which is essential for thriving in our transparent DRI/IC model.

Technologies We Use and Teach

• Java, Kotlin
• AWS
• HTTP, JSON, gRPC, Protocol Buffers
• OkHttp, Jetty, JUnit, Guice
• Hibernate, jOOQ, Aurora, MySQL, DynamoDB, Redis, Vitess
• Kafka, event-driven architecture, microservices
• DataDog
• Buildkite, Gradle

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 an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We also consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis.We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations throughout the recruitment process. If you require an accommodation, let your recruiter know.  Want to learn more about what we’re doing to build an inclusive workplace? Check out our Inclusion & Diversity page.

Blue Moon Metals is seeking an experienced and dynamic Senior Project Engineer to join our corporate office, supporting all projects across our organization. This pivotal role is responsible for providing technical expertise, project oversight, and strategic guidance to ensure successful delivery of engineering projects company-wide.  The Senior Project Engineer's immediate assignment will be to our Nussir Project in Northern Norway, requiring long-term stays or relocation to the project region.

Key Responsibilities

• Manage and coordinate engineering efforts for multiple projects, ensuring adherence to technical standards, budgets, and schedules.
• Support project managers and site teams with technical expertise, problem-solving, and risk assessment throughout the project lifecycle.
• Develop and review project scopes, specifications, drawings, and deliverables for accuracy and compliance with company and regulatory requirements.
• Collaborate with cross-functional teams—including design, procurement, construction, and quality assurance—to drive project objectives and resolve technical challenges.
• Facilitate technical meetings, workshops, and design reviews; present recommendations to senior leadership and stakeholders.
• Monitor project progress, identify deviations, and implement corrective actions as required.
• Lead initiatives to improve engineering processes, standardization, and best practices across all projects.
• Mentor and support the professional development of junior engineers and project staff.
• Stay current on industry trends, emerging technologies, and regulatory changes relevant to the metals and construction sectors.

Qualifications and Experience

• Bachelor’s degree in Engineering (Mechanical, Civil, Structural, or related discipline); Master’s degree or P.Eng designation is an asset.
• Minimum 8 years of progressive engineering experience, with at least 3 years in a senior or lead project role in metals, mining, construction, or heavy industry.
• Demonstrated success managing complex, multi-disciplinary projects from conception to completion.
• Strong understanding of project management methodologies, engineering standards, and regulatory requirements in Canada and internationally.
• Exceptional communication, leadership, and interpersonal skills.
• Proficiency with engineering and project management software (e.g., Deswik or other CAD software, MS Project, Primavera).
• Ability to travel domestically and internationally as needed.

Pay range and compensation package

Compensation details will be discussed during the interview process.

Equal Opportunity Statement

We are committed to diversity and inclusivity in our hiring practices and encourage applications from all qualified individuals.

It all started with an idea at Block in 2013. Initially built to take the pain out of peer-to-peer payments, Cash App has gone from a simple product with a single purpose to a dynamic ecosystem, developing unique financial products, including Afterpay/Clearpay, to provide a better way to send, spend, invest, borrow and save to our 50+ million monthly active customers. We want to redefine the world's relationship with money to make it more relatable, instantly available, and universally accessible.

Today, Cash App has thousands of employees working globally across office and remote locations, with a culture geared toward innovation, collaboration and impact. We've been a distributed team since day one, and many of our roles can be done remotely from the countries where Cash App operates. No matter the location, we tailor our experience to ensure our employees are creative, productive, and happy.

The Role

On Cash App's Controls team, we build essential platform infrastructure that protects millions of Cash App customers while ensuring fair and equitable access to financial services. We partner across engineering, product, and risk teams to build highly-available infrastructure that powers critical trust and safety decisions throughout Cash App's ecosystem. We are an AI-driven engineering team — we use agentic coding tools across our entire development lifecycle, from design exploration through implementation and review, and we expect every engineer to do the same. In this role, you'll implement scalable solutions that enable billions of safe customer interactions that create a holistic experience that fosters the trust, safety, security, and support of our customers and their assets, directly contributing to Block's mission of economic empowerment through accessible and secure financial services.

You Will

• Partner closely with product managers, designers, engineers, and business leads to scope, plan, design, build, and launch new features as well as maintain existing functionality of our product controls ecosystem
• Lead technical discussions within your team and contribute to design and product discussions with partners across the organization
• Leverage your experience and knowledge to grow your teammates' technical breadth and depth through mentoring
• Direct AI agents across the full development lifecycle — from prototyping and implementation to debugging and code review — operating as the architect and decision-maker while AI handles the building
• Expand what's possible with AI tooling — identify opportunities to automate repetitive work, improve code quality through AI-driven review, and share effective patterns with your team

You Have

• 6+ years experience building and operating highly available services
• Experience contributing to cross-functional technical efforts and coordinating across teams
• Strong collaboration skills and customer empathy
• A growth mindset and comfort navigating open-ended problems
• Well-developed curiosity and initiative to build creative solutions to complex problems
• Contributed to the growth of fellow engineers through technical leadership and mentoring
• Demonstrated fluency with AI-assisted development tools (e.g., Claude Code, Cursor, GitHub Copilot, or similar agentic coding tools) in real production work — not just familiarity, but regular, effective use
• You stay current on the rapidly evolving landscape of AI tooling and actively experiment with new capabilities as they emerge

Technologies We Use and Teach

• AI-Driven Development: Claude Code, Goose (Block's open-source AI agent), Cursor, GitHub Copilot, Anthropic's Model Context Protocol (MCP)
• Kotlin, Java
• HTTP, JSON, gRPC, Protocol Buffers
• DynamoDB, MySQL
• Event-driven architecture (Kafka)
• DataDog, Prometheus
• AWS, Kubernetes

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 an equal opportunity employer evaluating all employees and job applicants without regard to identity or any legally protected class. We also consider qualified applicants with criminal histories for employment on our team, and always assess candidates on an individualized basis. We believe in being fair, and are committed to an inclusive interview experience, including providing reasonable accommodations throughout the recruitment process. If you require an accommodation, let your recruiter know.  Want to learn more about what we’re doing to build an inclusive workplace? Check out our Inclusion & Diversity page.