### **Who We Are:**

Our mission is to scale decentralized networks by significantly reducing the costs of zero-knowledge proofs. Founded in 2019, Horizen Labs is dedicated to building a more secure and equitable digital world at the heart of the decentralization revolution. Dedicated to elevating blockchain technology to unprecedented efficiency, we significantly reduce costs for proof verification without compromising security. Focusing on building next-gen, modular architecture, enhanced with composable zero-knowledge proofs, we are not just advancing the field - we are setting new benchmarks for performance, security and cost-effectiveness. At Horizen Labs, our people are our greatest asset, and we are creating a culture of empowered individuals who are eager to bring their ideas to life. We are looking for creative individuals to join our team of the best and brightest minds in the blockchain space. You will experience the exhilaration of joining a fast-growing and innovation-focused company. We believe diversity drives the innovation and engagement necessary to build a truly remarkable product. We operate on a hybrid model with a distributed global workforce who works in partnership with our satellite offices in New York City, NY and Milan, Italy. This allows us the flexibility to go to where the talent is. Are you ready to help us change the future with the next cutting-edge blockchain technology? Join us!

We are looking for a talented and motivated engineer who will contribute to building the cryptographic infrastructure of our Web 3.0-enabled blockchain ecosystem. You will be involved in the design and implementation of blockchain scaling solutions, primarily based on zero-knowledge cryptography, with the aim of dramatically reducing the costs that blockchain operators incur when deploying their products. Our international team works in a stimulating and innovative environment, where technical expertise and experience contribute to the development of cutting-edge blockchain technology. You will be joining a small, deeply driven team of highly technical minds in a culture of openness, pragmatism, and ownership of challenging problems that span software engineering, systems design, cryptography, and computing.

### **What You’ll Own**

- Design and implementation of blockchain-based cryptographic solutions leveraging modern cryptography (ZK, MPC, FHE).
- Assume technical responsibility of novel systems while identifying areas for innovative research and development.
- Writing reusable, testable, and efficient code with a focus on best practices and security.
- Help shape the future of the company where you will be intimately involved in the strategic decision making process and immediately see the impact of your contributions.
- Attend conferences and find opportunities in the on-chain ecosystem.

### **Skills and Qualifications**

- 5+ years of experience in software engineering.
- Be passionate about secure, reliable, well-documented and fast software.
- Flexible to work within an agile environment.
- Experience in implementing cryptographic constructions (down to the low-level mathematics) and familiarity with various common attacks.
- Deep understanding of applied cryptography and passion for creating effective and pragmatic cryptographic solutions to be integrated in complex systems and/or to conceive innovative products solving real world problems.
- Propose new meaningful approaches based on novel cryptography research available in academia.
- Experience in technical writing and documentation.
- Clear communication and articulation of abstract ideas.
- Enjoy guiding more junior developers and sharing your expertise.
- Work gracefully with cross-functional teams within engineering, marketing, and other support teams to provide the best-in-class solutions.
- Autonomous, self motivated, and low ego.

### **Preferred Qualifications**

- Experience with system languages (C, C++, Go) and/or strongly typed programming (OCaml, Haskell, Rust).
- Theoretical and practical experience in state-of-the-art zero knowledge solutions such as Plonk (Plonky2, Plonky3, Halo2), STARKs, zk(E)VMs, recursive proof composition.
- Theoretical and practical experience in blockchain-based systems, with a particular focus on Ethereum and/or other EVM-based solutions.
- Experience with optimization of low-level mathematical operations, down to assembly level.
- Any experience with GPU/FPGA programming is welcomed.

Senior Cryptographic Engineer

### **Who We Are:**

Our mission is to scale decentralized networks by significantly reducing the costs of zero-knowledge proofs. Founded in 2019, Horizen Labs is dedicated to building a more secure and equitable digital world at the heart of the decentralization revolution. Dedicated to elevating blockchain technology to unprecedented efficiency, we significantly reduce costs for proof verification without compromising security. Focusing on building next-gen, modular architecture, enhanced with composable zero-knowledge proofs, we are not just advancing the field - we are setting new benchmarks for performance, security and cost-effectiveness. At Horizen Labs, our people are our greatest asset, and we are creating a culture of empowered individuals who are eager to bring their ideas to life. We are looking for creative individuals to join our team of the best and brightest minds in the blockchain space. You will experience the exhilaration of joining a fast-growing and innovation-focused company. We believe diversity drives the innovation and engagement necessary to build a truly remarkable product. We operate on a hybrid model with a distributed global workforce who works in partnership with our satellite offices in New York City, NY and Milan, Italy. This allows us the flexibility to go to where the talent is. Are you ready to help us change the future with the next cutting-edge blockchain technology? Join us!

We’re looking for an experienced and highly enthusiastic Senior DevOps Engineer to join the team. At Horizen Labs, our DevOps Engineers are responsible for building and maintaining automation, orchestration, installation, and configuration procedures, tailored for several Public Cloud platforms, as well as for dedicated servers. Moreover, they work hand-in-hand with our Software Engineers to architect and construct streamlined software development pipelines and environments.

### **Key Responsibilities**

- Design and implement scalable automation and orchestration pipelines to ensure systems are robust and maintainable.
- Design and maintain internal tools for the team.
- Build and update installation and configuration procedures for all our Providers.
- Manage and deploy Infrastructure through Terraform, Ansible, shell scripts, Github Actions and Travis-CI.
- Secure and protect production environments and secrets against attacks in the challenging Blockchain space.
- Create and maintain documentation for infrastructure, configurations, and processes.
- Collaborate with Software Engineers to design and construct efficient software development pipelines and environments.
- Conduct research, test and apply new techniques and tools that improve the DevOps process and performance.
- Cost monitoring and infrastructure optimization.

### **Qualifications and Experience**

- 3+ years of practical experience as DevOps, ideally combined with previous experience as Backend Developer.
- Familiarity with Infrastructure as Code concepts and tools like Terraform and Ansible for orchestration/configuration management.
- Experience working with:
    - Linux/Unix System Administration (e.g. Debian, Ubuntu, Alpine).
    - Intermediate knowledge of a scripting language like Bash or Python.
    - Software Version Control tools like GIT, GitHub, Subversion (SVN).
    - Creating customized Dockerfiles following Docker best practices.
    - Cloud providers, preferably AWS.
- Familiarity with DevOps Methodologies with a focus on CI (Continuous Integration), CD (Continuous Delivery) and IaC (Infrastructure as Code).
- Working proficiency and communication skills in verbal and written English.
- You are passionate about the promise of blockchain technology.
- You aren’t afraid of working in a fast-paced environment, understanding when to ask for help or when to pull up your sleeves to get stuff done.
- Self-motivated and results-oriented.

### **Nice to have**

- Experience bringing large-scale projects to production and maintaining high-quality of service.
- Experience working in Agile teams.
- Knowledge of blockchain architecture and internals.

Senior DevOps Engineer - Engineering Operations

### **Who We Are:**

Our mission is to scale decentralized networks by significantly reducing the costs of zero-knowledge proofs. Founded in 2019, Horizen Labs is dedicated to building a more secure and equitable digital world at the heart of the decentralization revolution. Dedicated to elevating blockchain technology to unprecedented efficiency, we significantly reduce costs for proof verification without compromising security. Focusing on building next-gen, modular architecture, enhanced with composable zero-knowledge proofs, we are not just advancing the field - we are setting new benchmarks for performance, security and cost-effectiveness. At Horizen Labs, our people are our greatest asset, and we are creating a culture of empowered individuals who are eager to bring their ideas to life. We are looking for creative individuals to join our team of the best and brightest minds in the blockchain space. You will experience the exhilaration of joining a fast-growing and innovation-focused company. We believe diversity drives the innovation and engagement necessary to build a truly remarkable product. We operate on a hybrid model with a distributed global workforce who works in partnership with our satellite offices in New York City, NY and Milan, Italy. This allows us the flexibility to go to where the talent is. Are you ready to help us change the future with the next cutting-edge blockchain technology? Join us!

We are looking for an experienced and seasoned **Principal Engineer** who will play a critical role in designing, building, and optimizing our Web 3.0-enabled blockchain ecosystem. As a senior technical leader, the scope of your impact is significant & far-reaching, where you set technical direction, craft the company’s technical roadmap, and bring true innovation to the wider blockchain / crypto / software communities. You are still extremely in tune with day-to-day execution activities, where you will ship mission-critical products across various product teams, all while adhering to best-in-class coding standards and best practices. Our international team works in a stimulating and innovative environment, where technical expertise and experience contribute to the development of cutting-edge blockchain technology. You will be joining a small, deeply driven team of highly technical minds in a culture of openness and pragmatism, where you’ll work on challenging problems that span software engineering, systems design, cryptography, and computing.

# **What You’ll Own**

- Lead the architecture, design, and implementation of various components of our blockchain ecosystem, including core L1 protocol components, L2 scaling frameworks, cryptographic toolkits, off-chain and multi-chain interactions, APIs, node infrastructure, and usability.
- Be a major voice in setting the direction and goals for the entire engineering organization, especially in terms of project impact, quality, and engineering efficiency.
- Continually craft and refine our high-level technical roadmap to scale across multiple dimensions of blockchain integrations, applications, and engineering operations as we grow.
- Deliver innovative blockchain products from concept to reality, by working hands-on with senior engineers, cryptographers, and product managers to effectively resolve ambiguity, navigate through trade-offs, and ensure drama-free and on-time software launches.
- Constantly influence engineering culture by raising the technical bar, increasing velocity, and advocating for higher code quality and engineering efficiency.
- Proactively identify areas of technical strategic opportunity, where you take intelligent risks that are fully aligned with the company mission and product goals.
- Teach, mentor, grow, and provide advice to engineering managers, senior and junior engineers, product managers, project managers, and senior leadership.

**Skills and Qualifications**

- 10+ years of software development experience, especially with designing, building, and scaling multiple production services, components, and infrastructure.
- 5+ years of experience in a technical leadership role (such as Senior/Staff Engineer) setting technical direction, seeing mission-critical projects into Mainnet/Production, and supporting multiple production services over multiple years as they evolved to scale with user demand and challenges.
- Strong experience owning multiple, months-long projects, including communication of progress, project dependencies, and risk mitigation directly with cross-functional stakeholders and partners.
- Deep hands-on experience with at least one major blockchain protocol (Ethereum, Bitcoin, Polkadot, Cosmos), which may include applied cryptography, consensus algorithms, UTXO/Account-based models, rollups, zero-knowledge proofs, zkEVM/zkVMs, peer-to-peer network topologies, and bridging mechanisms.
- Bachelor's, Master's, or Ph.D. degree in Computer Science, Mathematics, or related field.
- Deep knowledge of programming languages (especially Rust and/or C++), tools, and frameworks required to successfully build and deploy production blockchain services, with prior experience selecting these tools and frameworks.
- Infinitely curious and passionate about programmable blockchains and their role in the future of finance, privacy, and digital identity.
- Excellent communicator (both verbal and written) who can effortlessly articulate the architecture of an entire system, influence others in relation to a large range of technical and business decisions, and create technical specifications that guide the implementation for other engineers.
- A natural inclination to dive into understanding, debugging, and improving any layer of the stack.

**Preferred Qualifications**

- Expert knowledge in Rust and/or C++, where you have designed, developed, and delivered several projects successfully into Mainnet.
- Collaboration with cryptographers to translate cryptographic primitives and protocols into ****efficient and secure Production-level code.
- Solid understanding of cryptographic primitives, protocols, and algorithms, including zero-knowledge proving systems, homomorphic encryption, and secure multiparty computation.
- Deeply immersed in the latest advancements in cryptography, zero-knowledge proofs, and blockchain protocols, along with demonstrated ability to incorporate relevant findings into real-world products for the company.

Principal Engineer

Horizon Labs

Horizen Labs was founded in 2019 to secure the world’s transition to web3 by building enterprise-grade blockchains and web3 products for the real-world. A globally distributed team with offices in Milan and New York City, Horizen Labs offers expertise in zero-knowledge cryptography and bespoke web3 engineering capabilities while producing essential products to scale programmable, scalable blockchains and protocols.

Horizen Labs prides itself in being a center of collaboration in the Web3 space, working closely with Animoca Brands, Yuga Labs, LayerZero, and others.

Horizon Labs

Open roles