Quantstamp is the leading blockchain security company in an emerging industry. Whether your expertise is in security research or NFTs, we are looking for team members motivated to take initiative and solve challenging problems. 

Quantstamp is looking for an applied cryptographer. Quantstamp often deals with a wide range of cryptographic problems, including reviewing implementations and tackling new theoretical problems using cryptography. For example, Quantstamp regularly receives requests to review code bases which either invoke or implement (custom) cryptography, as part of an audit.

Zero knowledge applications are becoming more common across all ecosystems, and this kind of math will also soon be the basis of several scaling solutions - in particular, zero knowledge rollups. These applications often use a zero-knowledge Succinct Non-interactive Argument of Knowledge (zk-SNARK) proof system, or a zero-knowledge Succinct Transparent Argument of Knowledge (zk-STARK) proof system.

Your day-to-day work will involve doing research about various cryptographic protocols. Some protocols of interest will be those found in the code of our audit clients, others will be protocols of interest for future audits. In particular, in anticipation of audits of, or for, zero-knowledge rollup systems, you’ll be asked to understand various zero-knowledge proof systems. There are a lot of those - we don’t expect mastery in all of them, but mastery of at least one would be ideal.

You may be asked to compare and understand systems you’re not familiar with, and you should be comfortable doing this. Ideally you have a strong theoretical background but can also read and write code (the specific language is not too important). You will talk to other researchers within the company and may be asked to talk to clients directly, in a technical capacity.

**Required**

- Mastery of at least one zk-SNARK/zk-STARK proof system, or a strong enough technical background to understand one (and this should have some direct connection to cryptography)
- Ability to code and develop software. You should have experience with at least one major language, like Python, Java, or C; the exact language is not too important. You should be familiar with versioning software (specifically, GitHub), testing, and a familiarity with algorithms and data structures. 
- Ability to read and interpret academic papers
- Ability to communicate ideas
- Partial availability (2-6h) during EST work hours to allow for communication with the team.

**Nice to Have**

- Familiarity with existing ZK Rollup designs
- Familiarity with multiple ZK proof systems
- Strong coding ability
- Knowledge of software development in Solidity, including testing and various development frameworks like Hardhat.
- Familiarity with blockchain ecosystems, particularly Ethereum
- Familiarity with Circom for writing zero knowledge circuits

**Compensation & Perks**

- Competitive compensation package (commensurate to experience) + performance and referral bonuses.
- 100% remote and flexible working hours.
- Work from anywhere in the world.
- Generous paid time off, including maternity/paternity leave.
- Retirement/pension plan.
- Equity.
- Rent your own desk in a co-working space or work from anywhere at any time.
- Free gym membership or any virtual alternative of your choice.
- Learn about the hottest and newest products and trends in the crypto space before they appear on any news outlets.
- Join quarterly all-expenses-paid retreats in exotic/exclusive locations with the team.

Applied Cryptographer

**Summary**

As a software engineer, you will be responsible for implementing and maintaining the  product. You will be working in an agile team of experienced software engineers. You will be part of designing and defining the product you are building. You will be helping with smooth operation of systems, helping to identify causes, and fix them afterwards. You will be participating in sprint planning, creating tickets, implementing features, testing your code, finding bugs, conducting code reviews, and generally doing everything necessary for producing robust and reliable software products. 

**Candidate Profile**

- Background in Computer Science or related field
- 2-3 years of development experience in Rust
- Hands on experience with tooling related to Rust (build systems, package managers, unit testing, CI pipelines)
- Ability to develop software, implement mission-critical features, and navigate through a large codebase
- Experience with code review process and ability to conduct them
- Strong ability work in a team environment
- Fluency in Git and Github
- Ability to follow agile development process
- Attention to detail and ability to producing production-level code
- Active approach to work, taking initiative to define and complete tasks
- Critical thinking and problem solving skills, ability to work independently
- Habit of implementing thorough unit tests
- Highly detail-oriented mindset and willingness to learn
- Fluent English communication, both written and spoken

**Nice to Have**

- Experience with cryptography or security
- Understanding compilers and virtual machines
- Previous work with go-ethereum (geth) or rust-ethereum (reth)
- Basic understanding of blockchains and Ethereum

**Responsibilities**

- Development and maintenance of blockchain-related software, infrastructure, and products
- Operating blockchain networks and troubleshooting outages
- Participation in an on-call rotation schedule

**Compensation & Perks**

- Competitive compensation package (commensurate to experience) + performance and referral bonuses.
- 100% remote and flexible working hours. Work from anywhere in the world.
- Generous paid time off, including maternity/paternity leave.
- Retirement/pension plan.
- Option for Equity
- Rent your own desk in a co-working space or work from anywhere at any time.
- Free gym membership or any virtual alternative of your choice.
- Learn about the hottest and newest products and trends in the crypto space before they appear on any news outlets.
- Join quarterly all-expenses-paid retreats in exotic/exclusive locations with the whole team.

Senior Rust Engineer

As a smart contract auditor, you will be at the forefront of Web3, using a hacker mindset to identify vulnerabilities in target contracts of mainstream projects, including bridges, DeFi protocols, wallets, oracles, virtual machines, and much more. Come and join us in our mission of securing the blockchain!

This position is for candidates with an in-depth understanding of blockchain and smart contracts. To succeed in our testing for Auditing Engineer III, you must be well-versed in Ethereum, with a solid understanding of economic attacks, smart contract design patterns, issues with protocol integration, and the inner workings of the Ethereum Virtual Machine. You can identify complex bugs and vulnerabilities in large code bases. As a senior auditor, knowledge of the existing DeFi landscape is a must.

This job is fully remote - you can work from anywhere in the world!

**Candidate Profile**

- Background in Computer Science or any related field such as Mathematics & Physics.
- Loves to find bugs in software systems and has a great eye for detail.
- Fluent English communication, both written and spoken.
- Fluent in reading and writing medium (1 KLOC) to complex (> 10 KLOC) Solidity smart contracts.
- Knows the DeFi ecosystem landscape.
- Knows the main EIP standards and smart contract design patterns.
- Knows the major Ethereum smart contract security issues and economic attacks.
- Knowledge of how the EVM works.
- Hands-on experience with auditing supporting tools, including static analyzers and fuzzers.
- Understanding of different consensus mechanisms.
- Knows at least another ecosystem outside the EVM realm.
- Knows the major security issues in Web2.
- Partial availability (2-6h) during EST work hours to allow for communication with the team.

**Nice to Have**

- Extensive knowledge of computer and network security.
- Hands-on experience with blockchain projects.
- Reading proficiency in Rust.
- Pentesting skills and knowledge of traditional Web2 security.
- Hands-on experience with L2 scaling solutions, including optimistic and zero-knowledge-based roll-ups.

**Responsibilities**

- Perform code reviews/audits of blockchain projects in small teams of engineers.
- Help in the development and research efforts within Quantstamp.
- Interact with other team members to discuss the likelihood and impact of findings.
- Write and review audit reports before they are shared with the customer.
- Mentor junior team members.
- Interact with customers to clarify technical requirements and answer technical questions.

**Optional Opportunities**

- Perform research on a new topic in the crypto space and provide internal “Lunch and Learn” (LnL) sessions. There is an option to also record and publish LnLs on YouTube or other social media platforms.
- Participate and/or speak at international conferences and workshops about smart contracts and blockchain security.
- Work on internal research projects, building PoCs, forking and changing open-source tools, running experiments, etc.
- Write (academic) papers and collaborate with top-tier universities on the topic of smart contracts and blockchain security.
- Write patents related to smart contracts and/or blockchain.

Auditing Engineer III

Quantstamp is looking for a Senior Accountant to join our team who will specialize in digital asset tracking, accounting, and analysis. In this pivotal role, you will oversee and be responsible for the accounting and reporting of all digital asset activities within the organization. The Senior Accountant (Digital Assets) should be able to properly classify crypto activities across various blockchains and various activities such as DeFi, staking, swaps, and other types of transactions via crypto sub-ledger software.

**Your day-to-day work will involve:**

- Account and reconcile cryptocurrency transactions, wallets, exchanges, and De-Fi protocols for financial and tax reporting
- Verify digital asset balances to blockchain data and/or centralized exchange statements
- Perform monthly crypto close tasks in Bitwave (accounting sub-ledger software)
- Prepare crypto journal entries and digestible reconciliation schedules monthly
- Evaluate workflow processes and procedures to develop, recommend, and implement procedural and system changes to increase accuracy and efficiency
- Coordinate month-end and year-end closing activities to ensure timely reporting
- Provide support for other ad hoc analyses and projects as needed
- Other duties as assigned 

**Need to haves**

- Bachelor’s Degree and/or equivalent combination of education
- 3-5 years accounting/relevant work experience
- Understanding of crypto technology and accounting principles
- Able to produce work independently and also work in a collaborative environment
- Excellent communication and interpersonal skills
- Detail-oriented, highly organized, and able to work under pressure

**Nice to haves**

- CPA certification preferred, but not required
- Big 4 Auditing experience is a plus 

**Compensation & Perks**

- Competitive compensation package (commensurate to experience) + performance and referral bonuses
- 100% remote and flexible working hours
- Generous paid time off, including maternity/paternity leave
- Retirement/pension plan
- Equity
- Rent your own desk in a co-working space or work from anywhere at any time
- Free gym membership or any virtual alternative of your choice
- Learn about the hottest and newest products and trends in the crypto space before they appear on any news outlets
- Join our all-expenses-paid retreats in exotic locations with the whole team

Senior Accountant, Digital Assets

**Summary**

As a software engineer, you will be responsible for implementing and maintaining the  product. You will be working in an agile team of experienced software engineers. You will be part of designing and defining the product you are building. You will be helping with smooth operation of systems, helping to identify causes, and fix them afterwards. You will be participating in sprint planning, creating tickets, implementing features, testing your code, finding bugs, conducting code reviews, and generally doing everything necessary for producing robust and reliable software products. 

**Candidate Profile**

- Background in Computer Science or related field
- 1-2 years of development experience in Rust
- Hands on experience with tooling related to Rust (build systems, package managers, unit testing, CI pipelines)
- Ability to develop software, implement mission-critical features, and navigate through a large codebase
- Experience with code review process and ability to conduct them
- Strong ability work in a team environment
- Fluency in Git and Github
- Ability to follow agile development process
- Attention to detail and ability to producing production-level code
- Active approach to work, taking initiative to define and complete tasks
- Critical thinking and problem solving skills, ability to work independently
- Habit of implementing thorough unit tests
- Highly detail-oriented mindset and willingness to learn
- Fluent English communication, both written and spoken

**Nice to Have**

- Experience with cryptography or security
- Understanding compilers and virtual machines
- Previous work with go-ethereum (geth) or rust-ethereum (reth)
- Basic understanding of blockchains and Ethereum

**Responsibilities**

- Development and maintenance of blockchain-related software, infrastructure, and products
- Operating blockchain networks and troubleshooting outages
- Participation in an on-call rotation schedule

**Compensation & Perks**

- Competitive compensation package (commensurate to experience) + performance and referral bonuses.
- 100% remote and flexible working hours. Work from anywhere in the world.
- Generous paid time off, including maternity/paternity leave.
- Retirement/pension plan.
- Option for Equity
- Rent your own desk in a co-working space or work from anywhere at any time.
- Free gym membership or any virtual alternative of your choice.
- Learn about the hottest and newest products and trends in the crypto space before they appear on any news outlets.
- Join quarterly all-expenses-paid retreats in exotic/exclusive locations with the whole team.



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