Protocol Security Engineer

Who We Are → About Matter LabsAt Matter Labs, we are driven by the belief that freedom is the catalyst for progress and prosperity. Our mission is to promote freedom for everyone through the widespread adoption of cryptocurrency.To realize this vision, we are developing ZKsync, a verifiable blockchain network secured by zero-knowledge proofs. With over $250 …

About Polygon LabsPolygon Labs is a pioneering global blockchain payments firm dedicated to developing and maintaining cutting-edge infrastructure designed to facilitate instantaneous, reliable money transfers at internet scale. Our mission is to transition all financial transactions on-chain, empowering users with the Polygon Open Money Stack—a cohesive array of services and technologies that ensures the seamless movement of funds globally. Our robust infrastructure has already enabled trillions in on-chain value transfers, supporting millions of daily transactions for many of the world's leading banks, fintech companies, large enterprises, and consumer applications.Your RoleAs a Staff Engineer on the Polygon Proof of Stake (PoS) engineering team, you will play a pivotal role in enhancing one of the most widely utilized networks within the Web3 ecosystem. Reporting to the Senior Vice President of Engineering, you will spearhead initiatives to tackle complex protocol-level challenges concerning scalability, state growth, and latency, ultimately shaping the architectural framework for the future of Polygon PoS. This is an exceptional opportunity to contribute to Ethereum-aligned infrastructure designed for massive scalability, collaborating with some of the most skilled protocol engineers in the industry.Joining a compact, high-caliber team of 7 engineers, you will be expected to lead by example, promoting a culture of excellence in design, implementation, and teamwork. This position is ideal for individuals with extensive expertise in protocol design and Golang development who are eager to build high-performance, resilient systems in a rapidly changing technological landscape.Your ResponsibilitiesLead the design and prototyping of innovative, long-term solutions to address scalability, latency, and state growth challenges on the Polygon PoS network.Drive architectural decisions across the PoS codebase, contributing to systems such as Geth, Cosmos SDK, or CometBFT as required.Identify and resolve intricate technical challenges relating to protocol behavior, consensus, and state synchronization.Promote code quality, comprehensive documentation, testing procedures, and developer best practices throughout the team.Mentor and assist engineers across the stack, elevating the overall technical standards.Collaborate cross-functionally with protocol researchers, DevOps, security, and ecosystem teams to deploy robust upgrades to the live network.What You'll Need7+ years of backend or protocol engineering experience, with at least 2 years in senior or staff-level positions.Extensive experience with Golang, ideally within decentralized or distributed systems.

Job Summary The Senior Software Development Engineer is a vital member of our agile development team, focusing on creating and enhancing payment domain services. This role involves designing, developing, and implementing scalable software solutions tailored for high-transaction environments. Key Responsibilities: Collaborate with the agile development team to design, develop, and maintain robust services. Create technical design specifications to guide the development process. Advise on architectural and detailed designs that facilitate team collaboration. Mentor team members on software best practices including design, coding standards, troubleshooting, and automated testing. Engage with cross-functional teams to enhance system architecture and improve project efficiency. Work closely with the Product Owner to prioritize tasks and plan development activities. Uphold high software quality standards by establishing effective practices and methodologies. Assist in gathering and documenting user requirements, crafting user stories, and developing work plans. Participate in peer code reviews, offering constructive feedback to enhance code quality. Diagnose and resolve technical issues effectively. Engage in regular Continuous Integration/Continuous Deployment (CI/CD) practices. Support, maintain, and document software functionalities. Conduct research and evaluate software products, creating Proof of Concepts (PoCs) to showcase innovative ideas and technologies. Please note that the responsibilities listed above are not exhaustive and additional duties may be assigned as necessary.

Join Our Team as a Protocol SpecialistAt Unit 410, we are passionate about connecting with exceptional talent. Our philosophy is to build a strong team by fostering relationships before the need arises to hire. If you are intrigued by the innovative work we are doing, we would love to hear from you, regardless of whether the timing is right today or in the future.Our team consists of individuals who have contributed to some of the most impactful technologies in the industry, with backgrounds from renowned organizations such as NASA, Google, Coinbase, and Twitter. Frequently, we are at the forefront of the next big breakthrough in cryptocurrency. We actively support early major holders on networks and collaborate directly with founders and CTOs, earning a reputation as industry leaders.At Unit 410, you will experience autonomy and be encouraged to pursue your intellectual curiosity. Your contributions can influence not only our company but also the broader cryptocurrency landscape.We want to know what drives you—what challenges you are eager to tackle and the impact you wish to create. If your ambitions align with ours, we will find a way to collaborate effectively.Role OverviewAs a Protocol Specialist, you will identify emerging trends before they become evident and help transform them into tangible realities. You will explore new networks, uncover opportunities, coordinate with leading crypto institutions and protocol teams, and work closely with protocol leadership and our highly technical team to support new initiatives rapidly and effectively.The projects we undertake are characterized by their novelty, combined with our technical prowess that allows us to operate at a scale and speed that few can match. This positions you right at the forefront of the future of cryptocurrency.If you have a knack for analyzing complex systems, diving into validator code, or extracting insights from specification documents, this is your chance to channel that curiosity into meaningful impact.Your ResponsibilitiesClient Support: Collaborate directly with institutions and sophisticated clients engaging with new networks to alleviate challenges, assess risks, and ensure seamless, scalable experiences.Engineering Collaboration: Work alongside Unit 410’s engineering teams to design and implement infrastructure that facilitates participation in emerging protocols.Opportunity Discovery: Identify innovative ways to enhance client support, add value, and drive impactful initiatives across protocols.

Role Overview ispottv is looking for a Senior Software Development Engineer to help build and improve software products for the company’s entertainment technology platform. This is a remote role with full flexibility on location. What You Will Do Design, develop, and maintain software solutions that support ispottv’s business goals Collaborate with engineers and other team members to deliver features and resolve technical challenges Contribute to code reviews and provide technical guidance to peers About the Team Work alongside a group of professionals who share a strong interest in technology and entertainment. The team values open communication and creative problem-solving.

About Protocol Behavioral HealthProtocol Behavioral Health is dedicated to providing specialized behavioral health treatment for cancer patients in collaboration with oncology clinics and cancer centers. Recognizing that oncology patients are at an increased risk for mental health issues and suicidal thoughts, our mission is to enhance patient outcomes and treatment adherence while also managing overall care costs. We tailor our services to meet patients' emotional, logistical, and financial needs, delivering top-notch mental health support through a collaborative care model integrated directly into oncology practices.Our team consists of seasoned healthcare professionals and executives skilled in forging and scaling partnerships within the realms of behavioral health, oncology, and value-based care. As a rapidly growing, early-stage enterprise, we are committed to broadening access to care via robust alliances with leading oncology providers.About the RoleThe Business Development & Operations Support Manager is pivotal in facilitating Protocol's growth by identifying, evaluating, and advancing new partnership opportunities. This role is central to our business development initiatives, collaborating closely with leadership to manage pipeline activities, uphold CRM accuracy, assess new opportunities through financial and operational modeling, and ensure the seamless execution of the deal process.Reporting directly to the Chief Commercial Officer, this individual will be instrumental in propelling the operational framework behind Protocol's business development, ensuring leads are effectively monitored, opportunities prioritized, materials prepared, and procedures executed efficiently. This position is ideal for a detail-oriented and analytical professional eager to evolve into a more outward-facing business development leadership role over time.Key Responsibilities:Manage and maintain Protocol’s CRM, ensuring precise tracking of all leads, opportunities, and pipeline activities.Identify, prioritize, and monitor high-value partnership opportunities utilizing defined criteria, data analysis, and pipeline reports.Develop financial and operational models to assess new opportunities, factoring in patient volume estimates, provider coverage, and revenue forecasts.Assist in crafting pro formas, business cases, and internal documents to guide partnership decisions.Coordinate outreach and meeting logistics with both prospective and current partners, ensuring consistent follow-up and pipeline progression.

Renesas Electronics Corporation seeks a Senior Software Development Engineer based in Los Angeles. This position centers on creating software that enables new electronic devices used in automotive, industrial, and consumer applications. Key responsibilities Design and build software solutions for next-generation electronics Collaborate with multidisciplinary engineering teams Apply technical expertise to projects that influence products across several industries This role offers the chance to work on technology that reaches a broad range of markets and end users.

Join CoreWeave as a Senior Software Engineer focused on enhancing developer experience. You will be instrumental in creating robust software solutions that empower developers to maximize their productivity and creativity. This role will allow you to engage in challenging projects while collaborating with a talented team dedicated to innovation and excellence in a fast-paced environment.

Join our team at greenlight as a Senior Software Engineer focusing on Developer Experience. In this role, you will play a crucial part in enhancing the development workflows and tools that empower our engineering teams. Your expertise will help us build robust and efficient systems that streamline processes and improve overall developer productivity.We are looking for someone who is passionate about technology and has a knack for simplifying complex systems. You'll work closely with cross-functional teams to gather requirements, implement solutions, and drive continuous improvement in our development practices.

Join our dynamic team at Lightning Labs as an Assets Protocol Engineer! We are seeking a talented systems software engineer with extensive experience in applied cryptography, peer-to-peer networking, distributed systems, open source software, and cryptocurrency protocols, particularly Bitcoin. This pivotal role focuses on the design, implementation, and continuous evolution of the Taproot Assets Protocol (TAP).As an ideal candidate, you should possess a robust understanding of the core Bitcoin protocol and be familiar with proposed updates aimed at enhancing smart contracting capabilities, as well as established standards like Partially Signed Bitcoin Transactions (PSBTs). A genuine passion for Bitcoin and a commitment to simplifying its use for everyone is essential.

Are you ready to revolutionize connectivity from space, making it universally accessible, secure, and actionable? Look no further!E-Space is at the forefront of connecting Earth and space, enabling large-scale deployments of Internet of Things (IoT) solutions and services. Our innovative low Earth orbit (LEO) space system aims to transform the design, economics, manufacturing, and service delivery associated with traditional satellite and terrestrial IoT systems.We pride ourselves on our intentionality, curiosity, and unwavering commitment to innovating space-based communications. Our mission is to deliver actionable intelligence that expands global economies, protects our planet, and enhances overall quality of life.We are looking for a seasoned Wireless Communication Protocols and Networking Engineer to lead the design, implementation, and optimization of MAC and network layer protocols for cutting-edge wireless networking systems. This role is crucial for ensuring reliable, high-performance communication across our wireless infrastructure. A robust background in wireless networking is essential, and extensive experience with 5G protocols is highly desirable.In this role, you will architect and implement resilient MAC and network layer protocols while ensuring seamless integration with lower physical layers and upper application services. Collaboration with cross-functional teams will be key in developing, testing, and validating protocol solutions that support advanced wireless communication systems, including emerging 5G technologies.This position reports directly to the Senior Director of Product and System Integration and is located in our Saratoga, CA office.

About the TeamJoin the Statsig team at OpenAI, where we are at the forefront of experimentation, rollout, and analytics infrastructure that drives innovation in our product development processes. Our robust systems empower teams to safely launch features, conduct experiments, and assess the performance of product and model changes in real-time.Located in OpenAI’s Bellevue office, we foster a collaborative environment that prioritizes in-person teamwork, rapid execution, and the creation of tools that enable our fellow engineers to thrive.About the RoleAs a Senior Product Engineer on the Statsig team, you will play a pivotal role in designing and implementing the experimentation and rollout platform utilized by our diverse product and research teams at OpenAI. Your work will focus on developing the core infrastructure that ensures engineers can launch new features securely, conduct user testing, and gauge the impact of changes on a global scale.This position sits at the crossroads of product engineering and platform infrastructure, requiring close collaboration with teams across ChatGPT, the API, Growth, and Research to maintain rapid development cycles while upholding strong experimentation and rollout practices.Key Responsibilities:Design and build the core experimentation and rollout infrastructure that enables teams to safely launch and evaluate product and model changes.Develop systems for feature management, progressive rollouts, and canary deployments, allowing engineers to ship features quickly while minimizing risks to users.Collaborate closely with Data Science to facilitate the widespread adoption of advanced statistical methodologies.Work in partnership with product, infrastructure, and research teams to seamlessly integrate experimentation and rollout systems into the product development lifecycle.Lead significant technical initiatives, influencing the architecture and future evolution of OpenAI’s experimentation and launch infrastructure.Ideal Candidate:Possesses substantial experience in building internal tooling infrastructure, such as data platforms, experimentation frameworks, feature flagging systems, and developer platforms.Enjoys enhancing systems that empower other engineers to accelerate their work, with a strong focus on developer experience and platform usability.

Join our dynamic team at StemXpert as an Integration Engineer specializing in FIX Protocol. In this role, you will be responsible for designing, implementing, and maintaining integration solutions that enhance our trading platforms. Your expertise in FIX Protocol will be pivotal in ensuring seamless communication and data exchange between various financial systems.

Role Overview AECOM is hiring a Senior Software Engineer focused on Artificial Intelligence in Dallas. This position plays a key role in building AI solutions that support project delivery and improve efficiency across the organization. What You Will Do Develop and implement AI technologies for infrastructure and engineering projects Collaborate with teams to integrate AI tools into existing workflows Contribute technical expertise to advance AECOM’s technology initiatives Location This role is based in Dallas.

Role overview Renesas Electronics Corporation seeks a Senior Software Development Engineer based in Los Angeles. This position centers on creating and delivering new software solutions that support the company’s next-generation products. Responsibilities include designing and developing software, as well as implementing features that enhance existing systems. The role requires close collaboration with colleagues from various departments to move technology forward and address complex challenges. Key responsibilities Design and develop new software for advanced product lines Enhance and maintain existing software systems Work cross-functionally with other teams to support technology initiatives Location This role is based in Los Angeles.

Join Nintendo of America Inc. as a Senior Software Engineer!At Nintendo, we have been dedicated to creating smiles through unique entertainment experiences for over 30 years. Our mission is to bring joy through our beloved franchises such as Mario™, Donkey Kong™, and The Legend of Zelda™ across the Americas. Based in Redmond, Washington, we are proud to serve as the headquarters for Nintendo’s operations in the Americas. We foster a welcoming and inclusive environment, and we are committed to providing outstanding products and experiences to our diverse consumers and communities. For more information about our innovative products, visit our website.Team Overview: This position is within the IT: Consumer Online & Publishing department, part of the Consumer Online Modernization team. You will play a critical role in supporting various web-based technical applications that drive key business initiatives, including the external My Support Dashboard and other internal development tools. Your expertise will be essential in both application and test development.Key Responsibilities:Implement, test, and deploy complex systems while ensuring exceptional quality, security, and performance.Lead and participate in design reviews to determine the best technical solutions using available technologies.Mentor junior team members, providing constructive feedback and ensuring adherence to best practices.Take ownership of resolving product or system issues that affect critical business functions.Design, develop, and maintain comprehensive automated test frameworks and strategies across unit, integration, and end-to-end testing.Create and present clear, actionable test reports and metrics to promote transparency and aid in quality decisions.

Job Summary: As a Senior Software Developer at Medrio, you will play a pivotal role in the design, development, and documentation of our SaaS platform, focusing on enhancing functionality and improving the quality of our offerings. Essential Duties and Responsibilities: Develop and implement new features on the Medrio platform, adhering to established standards and operating procedures. Assist in quality assurance through functional and unit testing, defect triage, and regular code reviews. Generate and maintain comprehensive internal and external documentation, including design specifications, test plans, API documentation, and process manuals. Engage collaboratively in team activities such as meetings and planning discussions to foster inclusivity. Provide operational support for components of the Medrio platform within regulated and validated environments.

Role Overview Discord is looking for a Senior Software Engineer to focus on Developer Success in the San Francisco Bay Area. This role centers on improving the developer ecosystem so that creators can build outstanding experiences on the Discord platform. What You Will Do Design and implement solutions that make it easier for developers to use Discord’s tools and services. Work closely with teams across the company to solve challenging technical problems. Help shape the direction of developer-facing products and features. Drive initiatives that boost developer engagement and satisfaction. Who We’re Looking For Strong background in building high-quality software. Experience collaborating with multiple teams to deliver impactful solutions. Interest in supporting and improving the developer experience. Passion for technology and developer communities.

Galaxy Digital Services stands at the intersection of digital asset innovation and advanced data center infrastructure. The company’s platform spans trading, investment banking, asset management, staking, self-custody, and tokenization, while also investing in infrastructure that supports AI and high-performance computing. With a presence across North America, Europe, the Middle East, and Asia, Galaxy supports institutions, startups, and developers as they navigate the digital economy. Guided by a team with deep cryptocurrency and institutional experience, Galaxy pursues a vision where blockchain technology transforms the global flow of value. The company operates under a mission-driven culture that values excellence, selectivity, open disagreement, and independent decision-making. Teams work collaboratively while maintaining high alignment and flexibility. Role overview The Vice President of Protocol Engineering (Validators) leads the Blockchain Engineering Team focused on deploying, securing, and optimizing validator infrastructure across multiple blockchain networks. This group specializes in launching and maintaining validators, ensuring high availability, strong security, and consistent performance to support decentralized networks. What you will do Design, deploy, and manage validator nodes across various blockchain protocols Enhance automation workflows for validator operations Monitor network performance and optimize for reliability and efficiency Implement security measures to protect validator infrastructure Collaborate with blockchain protocols, foundations, staking platforms, and other stakeholders to drive operational excellence and innovation Our values Pursue Excellence Be Selective to Achieve Effectiveness Maintain High Alignment with Flexible Collaboration Disagree Openly Foster Independent Decision-Making Create Dream Teams Galaxy Digital Services is headquartered in New York City with remote opportunities available across the US. More about the company and its products can be found at www.galaxy.com.

At Develop Health, we are dedicated to transforming healthcare accessibility through artificial intelligence. Our innovative approach to automating intricate healthcare processes—such as benefit verification and prior authorization—has led us to achieve remarkable revenue milestones, growing from $0 to over $10 million in annual recurring revenue in less than two years. Currently, we support over 400,000 new patients each month.We collaborate with leading pharmacy benefit managers and payers across the nation, redefining healthcare interactions by removing human delays and enhancing efficiency. Our team consists of seasoned founders and engineers, many of whom have successfully launched and exited healthcare startups, including Rupa Health and Canvas Medical. Following a significant funding round, we are poised for rapid expansion.About The Role:We are looking for a talented Software Engineer to design and develop the systems and interfaces that drive our AI-powered healthcare platform. In this role, you will work across the entire stack—creating robust backend APIs, designing seamless integrations with our AI models, and crafting intuitive frontend experiences that simplify complex healthcare processes.As part of our elite team, you will engage directly with our AI and Product teams to integrate cutting-edge LLM capabilities into practical workflows, ensuring optimal performance and user experience. This is a unique opportunity to advance your career within a supportive and skilled engineering team.This position requires you to work on-site in Menlo Park at least three days a week, contributing to major product initiatives and helping to establish the framework for our next phase of growth.