Smart Contract Engineer Job at Childhood Cancer Society

Sr. Protocol Engineer, Product

We’re looking for an experienced protocol engineer to join our Trade team, build...

Location

United States

Salary:

200000.00 - 300000.00 USD / Year

Zora

Expiration Date

Until further notice

Requirements

4+ years of experience shipping production-level contracts or protocol features
Experience with DeFi protocols
Deep understanding of EVM
Familiarity with Git, Foundry, Hardhat and modern solidity toolchains
Experience with formal/invariant thinking, MEV considerations, upgrade safety, and incident response
Comfort moving across the stack when needed (TypeScript / React / Next / Python)
High degree of ownership and autonomy
Strong communication and collaboration skills, across both technical and non-technical teams

Job Responsibility

Contribute to the Zora protocol by designing and implementing smart contracts
Handle maintenance, security review, and full protocol lifecycle
Write adversarial tests (fuzzing, invariant/property-based testing) and maintain a security-first mindset in development and review
Partner with auditors and respond to findings
drive fixes through deployment
Participate in RFC and code review process with a security and reusability mindset
Collaborate across engineering teams to integrate smart contracts across the stack
Communicate status, updates, blockers, etc., to cross-functional stakeholders

What we offer

Remote-First Culture: Work from anywhere in the world!
Competitive Compensation: Including salary, pre-IPO stock options, token compensation, and additional financial incentives
Comprehensive Benefits: Robust healthcare options, including fully covered medical, dental, and vision for employees
Retirement Contributions: Up to 4% employer match on your 401(k) contributions
Health & Wellness: Free memberships to One Medical, Teladoc, and Health Advocate
Unlimited Time Off: Flexible vacation policies, company holidays, and recharge weeks to prioritize wellness
Home Office Reimbursement: To cover home office items, monthly home internet, and monthly cell phone (if applicable)
Ease of Life Reimbursement: To cover everything from an Uber home in the rain, childcare, or meal delivery
Career Development: Access to mentorship, training, and opportunities to grow your career
Inclusive Environment: A culture dedicated to diversity, equity, inclusion, and belonging

Fulltime

Smart Contract Engineer

DoubleZero is looking for a highly talented Smart Contract Engineer to join our ...

Location

Salary:

Not provided

DoubleZero

Expiration Date

Until further notice

Requirements

2+ years of smart contract experience, ideally with additional software development experience supporting large scale products
Substantial knowledge of Rust
experience with one or more of Typescript, Shell Scripting, Solidity, Move, and Go
Experience working on teams building businesses on one or more crypto protocols
Experience in working in scrum and sprint-based development environments, with high attention to detail in completing tasks on time
Experience building open source software systems, including consideration of the impact of changes to open source repos

Job Responsibility

Solana and beyond. Flex your engineering talents to write smart contracts on Solana/SVM and other chains as well as identify improvements needed to grow DoubleZero as we support multi-tenancy
Building Securely. Understand known vulnerabilities in smart contracts to build secure and stable code with supporting unit and integration tests
actively participate in auditing and testing of your code
Technical Knowledge. Understand smart contracts concepts including Solana, Ethereum and other blockchain technologies. Know when to build something new vs. to depend on an existing open-source library
Going beyond smart contracts. Build robust software that complements and interacts with the smart contract components of the DoubleZero protocol
Communication. Actively participate in the ongoing curation of the DoubleZero code base including facilitating discussions within issues and pull requests

Fulltime

Staff Smart Contract Engineer

I am currently partnered with a highly regarded blockchain protocol team who are...

Location

Salary:

200000.00 - 250000.00 USD / Year

Lawrence Harvey

Expiration Date

Until further notice

Requirements

Strong hands-on experience designing and deploying production-grade Solidity smart contracts on EVM chains
Deep understanding of EVM internals, security considerations, and upgradeability patterns
Experience contributing at a senior or staff level within a blockchain or protocol-focused engineering team
Prior exposure to Cosmos SDK or similar modular blockchain frameworks is highly desirable
Genuine passion for decentralised systems and building resilient, long-term blockchain infrastructure

Job Responsibility

Act as a core contributor in the design and development of modular, upgradeable Solidity smart contracts deployed on EVM-based chains
Translate existing protocol logic from a Cosmos SDK–based architecture into efficient, secure, EVM-native implementations
Collaborate closely with core engineering, DevOps, and product teams on protocol architecture, tokenomics, and on-chain/off-chain integrations
Drive best practices around security, upgradability, and scalability across the smart contract stack

What we offer

Tokens
Equity

Fulltime

Rail Systems Coordinator

At EKFB we’re shaping Infrastructure for a better tomorrow. We're looking for a ...

Location

United Kingdom , Milton Keynes

Salary:

Not provided

EKFB

Expiration Date

Until further notice

Requirements

Degree or equivalent experience in Engineering, Project Management or a related field
Experience in design coordination/management
Experience in infrastructure or civil engineering projects, ideally in a major project environment
Familiarity with Rail Systems and NTSN Disciplines
Understanding of NEC contract mechanism (Early Warnings, Technical queries etc.)
Strong stakeholder management and communication skills
Ability to produce high-quality documentation and technical records
Proficient in Microsoft Office and project collaboration tools (e.g. SharePoint, Smart Connect)
Experience with assurance processes and document control

Job Responsibility

Lead stakeholder interfaces for Rail Systems and National Technical Specification Notices (NTSN) including chairing key meetings such as integration and design reviews
Produce comprehensive meeting minutes capturing decisions and agreements in contractual and technical terms
Maintain and manage action trackers and issue logs, ensuring timely resolution and evidence-based closeout
Collaborate effectively with the client team while advocating for best-for-project outcomes
Liaise with design, construction, and assurance teams to address Rail Systems and NTSN concerns
Draft and manage technical queries and contractual communications, with a working knowledge of early warnings, general communications, and change events
Support the Rail Systems Discipline Lead in production and maintenance of interface management plans, ensuring assurance processes are followed and client comments are resolved
Review short-notice construction changes, assess Rail Systems and NTSN impacts, and coordinate resolutions with stakeholders
Oversee the development of interface control documents during design stage close out, ensuring client buy-in and tracking items for construction-stage development
Coordinate and support approval body reviews for NTSN

What we offer

competitive salary & benefits

Fulltime

Web3 Backend Engineer

UltaHost is launching decentralized infrastructure services by combining IPFS an...

Location

Salary:

Not provided

UltaHost

Expiration Date

Until further notice

Requirements

4+ years experience in backend development (Node.js, Go, or Python preferred)
Strong experience with IPFS, including pinning, gateways, and CID management
Proficiency in integrating Ethereum smart contracts via web3.js or ethers.js
Familiarity with Solidity smart contracts and on-chain data structures
Deep understanding of RESTful APIs and backend security practices
Experience with MongoDB, Redis, or PostgreSQL
Working knowledge of JWT, OAuth, and wallet-based authentication flows
Comfortable with Docker, CI/CD tools, and scalable backend architecture
Solid understanding of blockchain fundamentals, dApps, and decentralized identity

Job Responsibility

Build and maintain APIs and microservices that interact with IPFS and smart contracts
Develop secure upload, retrieval, and pinning systems for IPFS storage
Design backend logic to connect decentralized storage with blockchain-based access control
Write smart contract interaction modules for NFTs, subscriptions, or tokenized services
Handle user authentication via wallet (MetaMask, WalletConnect) and integrate on-chain identity
Optimize performance for high-volume IPFS-based content access
Maintain secure communication between backend systems and blockchain nodes (e.g., Infura, Alchemy, self-hosted)
Collaborate on architecture design with distributed systems and product teams
Write clear documentation and contribute to internal standards for secure Web3 APIs

What we offer

Competitive salary with performance-based bonuses
Access to top-tier infrastructure and mentorship in decentralized hosting
Opportunity to shape real Web3 products used by developers and creators globally
Remote Flexibility
Career Growth
Inclusive Culture
Skill Growth

Fulltime

Principal - Software Engineering - Blockchain & Smart Contracts

As Ethereum Blockchain Smart Contract you will be part of the Asset Management T...

Location

India , Bangalore

Salary:

Not provided

Fidelity Investments

Expiration Date

Until further notice

Requirements

Designing, implementing, and supporting distributed blockchain-based enterprise solutions for the financial/banking/asset management domain
Designing, writing and building secure and gas-efficient smart contracts for Ethereum based applications/token standard like ERC20, ERC721, and ERC1400 using Solidity along with third party interfaces and various design patterns like Upgradeable Proxy Pattern
Deep expertise in solidity smart contracts, EVM internals and gas-efficient design patterns
Evaluate and integrate with multiple blockchain protocols, including both EVM and non-EVM ecosystems(Polygon, Solana, Stellar)
Building Defi protocols by implementing token standards, staking protocols, yield farming liquidity pools and cross-chain protocols (LayerZero, Wormhole etc.,)
Hand-on experience with tools/frameworks like OpenZepplin, Hardhat, Ganache, Truffles
Write comprehensive and automated tests (unit, integration and fuzz) using frameworks like Foundry, Hardhat, Truffle or Brownie
Hands-on with security audit process, threat modelling and formal verification processes. Integrate audit feedback into production code. Familiarity with security tools Slither, MythX, Echidna
Continuously improve code quality through profiling and gas cost optimization techniques
Integrating, interoperability, bridging between blockchain/distributed ledgers with external components. Expertise in Oracles integration with Blockchain using Chainlink oracles

Job Responsibility

Design and develop enterprise blockchain solutions for use across Asset Management BU
Advocating for and developing new enterprise business use cases across Fidelity

Fulltime

Training and Policy Manager

The Training Manager is responsible for leading Sureserve Energy Services Meters...

Location

United Kingdom , Newmarket

Salary:

40000.00 - 50000.00 GBP / Year

Sureserve

Expiration Date

Until further notice

Requirements

Minimum 5+ years operational experience in smart metering
Experience mentoring or supervising engineers, authoring technical SOPs and work instructions, supporting compliance audits
Strong understanding of incident investigation processes and knowledge of client governance expectations
Proven experience in Training, ideally within utilities, energy, or smart metering environments
Excellent stakeholder management, communication, and problem-solving capabilities
Demonstrated leadership skills, with the ability to engage effectively across operational teams and senior management
Current Gas Safe Registration
CCN1
MET1 (or CMA1)
Relevant domestic gas competencies

Job Responsibility

Deliver classroom and field-based training in Smart Metering, domestic gas installation, safe isolation, and contract standards
Provide inductions for new engineers and Install Partners
Conduct competence assessments, post-incident retraining, return-to-work validations, mentoring, and toolbox talks aligned to incident and audit trends
Maintain and govern the competence matrix (Gas Safe, Smart qualifications, contract accreditation's)
Ensure all engineers remain compliant and in-date
Manage progression pathways and act as technical authority for competence sign-off
Own and maintain SOPs, Work Instructions, Risk Assessments, Method Statements, and TOPS documentation
Translate regulatory and client requirements into practical procedures
Ensure version control, audit traceability, and consistent standards across contracts
Drive root cause analysis, policy updates, and targeted retraining following incidents

What we offer

Contributory Pension scheme
Life assurance
29 days annual leave inclusive of bank holidays
Enhanced maternity, paternity, adoption leave, and other family friendly policies such as carer’s leave, neonatal leave, IVF, and assisted conception leave
Sureserve Benefits Hub, accessing over 1000’s retail discounts
Virtual GP service, 24/7, 365 days, available for employees and your immediate family
Employee assistance programme (EAP), available 24/7. 365 days, for employees and your immediate family
Bike2Work scheme

Vice President, DeFi Product Manager

The DeFi Product Manager is responsible for designing, evaluating, and scaling i...

Location

United States , Boston, MA; Jersey City, NJ; Chicago, IL

Salary:

130000.00 - 264000.00 USD / Year

Fidelity Investments

Expiration Date

Until further notice

Requirements

7–12+ years of experience across asset management, trading, structured products, derivatives, or capital markets
Demonstrated experience with portfolio construction, risk management, and investment decision-making
Strong understanding of fixed income, derivatives, financing markets, and liquidity dynamics
Deep understanding of blockchain architecture (Ethereum, L2s, Solana, and emerging ecosystems)
Strong working knowledge of smart contracts, DeFi primitives (AMMs, lending, derivatives, staking, restaking), and on-chain governance
Experience evaluating smart-contract risk and interpreting audit reports
Familiarity with MEV, oracle design, cross-chain bridges, and protocol upgrade patterns
Proven ability to design investment products from concept through launch and ongoing management
Extensive network across the DeFi ecosystem with a track record of trusted relationships
Strong written and verbal communication skills

Job Responsibility

Lead comprehensive due diligence of DeFi protocols
Assess protocol risk across market, liquidity, counterparty, technical, and governance dimensions
Maintain a living protocol risk taxonomy and scoring framework
Design and launch on-chain vaults and structured DeFi strategies
Curate vault parameters including asset eligibility, allocation limits, rebalancing logic, and risk constraints
Oversee ongoing vault monitoring, performance attribution, and risk reporting
Work closely with engineering teams to translate investment logic into smart-contract-enforced rules
Apply traditional portfolio construction, risk budgeting, and capital markets frameworks to on-chain strategies
Define stress testing, scenario analysis, and drawdown management approaches
Partner with legal, compliance, and operations teams to ensure products meet institutional governance and fiduciary expectations

What we offer

Comprehensive health care coverage and emotional well-being support
Market-leading retirement
Generous paid time off and parental leave
Charitable giving employee match program
Educational assistance including student loan repayment, tuition reimbursement, and learning resources

Fulltime

Smart Contract Engineer

Childhood Cancer Society

Location:

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Nice to have:

Additional Information:

Job Posted:
December 07, 2025

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Childhood Cancer Society

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Category:IT - Software Development

Contract Type:Not provided

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Job Description:

Job Responsibility:

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Job Posted:December 07, 2025

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