Smart Contract Engineer Job at DoubleZero

Smart Contract Engineer

The Childhood Cancer Society is dedicated to supporting families facing pediatri...

Location

Salary:

Not provided

Childhood Cancer Society

Expiration Date

Until further notice

Requirements

Proficiency in Solidity or similar programming languages for EVM smart contracts
Experience working with Ethereum and Layer 2 solutions (Arbitrum, Base)
Strong understanding of blockchain technology, token standards (ERC-20), and wallet integrations
Strong problem-solving skills and attention to detail
Excellent communication and teamwork abilities

Job Responsibility

Design, develop, and deploy EVM-compatible smart contracts for the cryptocurrency
Implement token standards (ERC-20) and ensure secure minting processes
Create and integrate smart contracts with Layer 2 solutions like Arbitrum and Base
Collaborate on establishing and managing liquidity pools (e.g., Automated Market Maker pools)
Participate in code reviews and provide constructive feedback
Maintain the security, scalability, and reliability of the platform

What we offer

Compensation for this role will be provided in cryptocurrency rather than cash

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

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

New

Staff Product Designer, Web3

We are seeking a passionate and highly experienced Staff Product Designer to joi...

Location

Salary:

Not provided

Deel

Expiration Date

Until further notice

Requirements

Deep Passion for Decentralization: A genuine, deep-seated passion for Web3, and the ethos of true digital ownership
Extensive Design Experience: A minimum of 7-9 years as a Product Designer, with at least 2 years leading holistic design as a Staff Product Designer (or equivalent title)
Data-Informed Design in an Anonymous World: Your design work is rooted in experimentation and evidence, utilizing qualitative data, protocol analytics, and on-chain metrics to back your decisions
Comfortable with High-Stakes Ambiguity: Able to drive clarity and high-quality solutions in a Web3 ecosystem that changes daily
Balances User Ownership and Protocol Requirements: Equally focused on empowering the user with true ownership (UX) and ensuring the integrity and security of the underlying protocol (Business/Technical needs)
Strong Communicator and Educator: An outstanding communicator capable of translating complex blockchain mechanics for a mainstream audience
Mentorship Experience: Proven track record of mentoring designers, helping them navigate the unique security and usability challenges of decentralized design
Cross-Functional Collaboration: Experienced working in an 'embedded' fashion with blockchain engineers and smart contract developers
Industry Knowledge: Solid-level knowledge of Crypto, DeFi, and digital asset management is non-negotiable

Job Responsibility

Lead Web3 Design Initiatives: Define, own, and deliver the end-to-end design for core decentralized services, DApps, and protocols. Translate the complexity of smart contracts, governance models, and token economics into intuitive, trustworthy user experiences
Collaborate Across the Chain: Work tightly with our engineering and protocol teams to understand the technical constraints and opportunities of various blockchains (e.g., Ethereum, Solana, Layer 2s). You'll be designing for immutability, which requires a whole new level of rigor
Advocate for Decentralized Design Systems: Champion a design system that is flexible enough for rapid Web3 innovation yet robust enough to handle high-security interfaces like wallets and staking mechanisms. You'll be designing the 'trust' layer
Prototype with Precision & Speed: Rapidly design, prototype, and test new features, focusing heavily on reducing friction in Web3 flows (wallet connection, transaction signing, gas fees, seed phrase security). Deliver thoughtful solutions in an environment where ambiguity is the norm, and regulation is a moving target
Mentor and Grow the Guild: Mentor Product Designers on the unique challenges of designing for decentralization, including education, security, and the psychological impact of self-custody. Lead design critique focused on crypto UX best practices
Make it feel native: Crypto and FIAT currency go hand in hand in Deel. Workers can withdraw both to their benefit and you will need to create a seamless experience between them
Drive Clarity from Cryptic Complexity: Navigate the deep technical waters of Web3 to distill complex cryptographic concepts, into crystal-clear user narratives and interfaces. If you can make a MetaMask transaction feel friendly, you're our person
Outstanding Communication and Community Facilitation: Bring people together - from anonymous users to core developers - through inspiring design and clear narratives. Effectively communicate a design vision within a transparent, often pseudonymous, community environment

What we offer

Stock grant opportunities dependent on your role, employment status and location
Additional perks and benefits based on your employment status and country
The flexibility of remote work, including optional WeWork access

Fulltime

Lead Blockchain Engineer

We’re looking for a Blockchain Development Lead to join our Engineering team and...

Location

India , Noida

Salary:

Not provided

Taazaa Inc

Expiration Date

Until further notice

Requirements

5+ years of software development experience
2+ years in blockchain or distributed systems
Strong experience with Solidity, Rust, or Go for blockchain protocols or smart contract development
Hands-on experience with Ethereum, Hyperledger, Polygon, or Solana ecosystems
Deep understanding of cryptographic primitives, consensus algorithms, and decentralized architectures
Familiarity with web3 libraries, Node.js/TypeScript, and REST/gRPC API integration
Proven experience in leading teams, conducting code reviews, and mentoring developers

Job Responsibility

Architecture & Design: Lead the design of scalable, secure, and efficient blockchain systems (permissioned and public)
Technical Leadership: Mentor and guide developers on smart contracts, distributed ledger design, and cryptographic principles
Integration: Collaborate with backend, cloud, and data engineering teams to integrate blockchain components with existing SaaS architectures
Innovation: Evaluate emerging technologies (L2s, ZK proofs, stablecoins, cross-chain protocols) for use in real-world business applications
Quality & Security: Establish best practices for code reviews, audits, and on-chain security
Collaboration: Partner with cross-functional teams including Product Managers, Designers, and Data Scientists to prototype and deploy blockchain-powered features

What we offer

Continuous professional growth, offering workshops and training
Work-life balance with flexible hours and remote options
Competitive salaries
Health benefits
Various perks

Fulltime

New

Dual Fuel Smart Meter Engineer

Location

United Kingdom , Guildford; Woking; Farnham; Reading; Basingstoke; Redhill; Crawley; Horsham; Oxford; Oxfordshire

Salary:

Not provided

Octopus Energy

Expiration Date

Until further notice

Requirements

Currently working on the Octopus Energy contract
Have CCN1 - MET1 or CMA1 - MET1
Held a valid MOCoPA within the last 3 years (and can provide evidence)
Have a Full UK Driving license with no more than 6 points

Fulltime

New

Dual Fuel Smart Meter Engineer

Location

United Kingdom , Sheffield

Salary:

Not provided

Octopus Energy

Expiration Date

Until further notice

Requirements

Currently working on the Octopus Energy contract
Have CCN1 - MET1 or CMA1 - MET1
Have held a valid MOCoPA within the last 3 years (and can provide evidence)
Have a Full UK Driving license with no more than 6 points

Fulltime

Smart Contract Engineer

DoubleZero

Location:

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

Job Description:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:
February 21, 2026

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Job Description:

Job Responsibility:

Requirements:

Additional Information:

Job Posted:February 21, 2026

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Job Posted:
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