Javascript Jobs in Web3

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Job Position Company Posted Location Salary Tags

Fmr

Boston, MA, United States

$140k - $285k

Tether

Milan, Italy

$36k - $54k

Tether

Warsaw, Poland

$36k - $54k

Tether

Bucharest, Romania

$91k - $115k

Tether

Dublin, Ireland

$91k - $115k

Zscaler

Remote

$115k - $126k

Zinnia

Remote

$96k - $112k

Kraken

United States

$127k - $254k

Brave

Remote

$120k - $15k

Brave

Remote

$119k - $150k

Tether

Buenos Aires, Argentina

$91k - $115k

Tether

Sao Paulo, Brazil

$91k - $115k

Tether

TI Lugano CH

$91k - $115k

Tether

Islamabad, Pakistan

$91k - $115k

Tether

Barcelona, Spain

$91k - $115k

Fmr
$140k - $285k
245 Summer St, Boston MA United States of America

Job Description:

The Role We are seeking a highly skilled and technically driven individual with deep expertise in blockchain engineering and applied data science to join Fidelity Digital Asset Management. This role is ideal for a hands-on expert who thrives in architecting and deploying advanced blockchain solutions, smart contracts, and quantitative models that support Research, Trading, Risk, and Operations. You will serve as a senior technical authority, driving innovation and ensuring the robustness of our digital asset infrastructure.

Key Responsibilities

Architect and oversee the development of blockchain-based systems and smart contracts across EVM, Solana, and Cosmos SDK platforms. Lead technical design and implementation of crypto infrastructure, including secure deployment pipelines, testing frameworks, and audit processes. Collaborate with quant researchers and data scientists to integrate blockchain data into predictive models, optimization engines, and trading algorithms. Conduct deep technical reviews and audits of smart contracts, ensuring security, scalability, and compliance with DeFi standards. Evaluate and implement emerging technologies, protocols, and tooling to enhance Fidelity’s digital asset capabilities. Serve as a technical liaison across engineering, trading, and risk teams to ensure seamless integration of blockchain systems into core workflows

The Expertise and Skills You Bring

4+ years of hands-on experience in blockchain engineering, smart contract development, or crypto infrastructure, with a strong track record of technical delivery. Deep understanding of EVM/SVM architecture, token standards (ERC-20, ERC-721, SPL), and DeFi primitives. Proficiency in multiple programming languages including Python, Solidity, and JavaScript/TypeScript. Experience with smart contract frameworks and tools such as Hardhat, Truffle, OpenZeppelin, Mythril, and Ganache. Strong background in quantitative modeling, data science, or financial engineering, with experience applying models to trading or risk systems. Proven ability to lead complex technical projects and mentor senior engineers in a collaborative, high-performance environment.

The Team

Fidelity Digital Asset Management [FDAM] is building an investment platform offering digital asset products and services designed to meet the growing needs of Fidelity’s retail customers and intermediary and institutional clients. The Data Science team is a highly collaborative group leading technical projects across the FDAM organization to enable effective management of investment products and services. Project examples include integration of vendor infrastructure, constructing models or tools, building automation across technologies, and portfolio or business analytics. As a hands-on team lead you will be expected to understand the function needs to both meet the expected outcome and continue to drive innovation

The base salary range for this position is $140,000-285,000 USD per year.  Placement in the range will vary based on job responsibilities and scope, geographic location, candidate’s relevant experience, and other factors.

Base salary is only part of the total compensation package. Depending on the position and eligibility requirements, the offer package may also include bonus or other variable compensation.   

We offer a wide range of benefits to meet your evolving needs and help you live your best life at work and at home.  These benefits include comprehensive health care coverage and emotional well-being support, market-leading retirement, generous paid time off and parental leave, charitable giving employee match program, and educational assistance including student loan repayment, tuition reimbursement, and learning resources to develop your career.  Note, the application window closes when the position is filled or unposted. Please be advised that Fidelity’s business is governed by the provisions of the Securities Exchange Act of 1934, the Investment Advisers Act of 1940, the Investment Company Act of 1940, ERISA, numerous state laws governing securities, investment and retirement-related financial activities and the rules and regulations of numerous self-regulatory organizations, including FINRA, among others. Those laws and regulations may restrict Fidelity from hiring and/or associating with individuals with certain Criminal Histories.

Most roles at Fidelity are Hybrid, requiring associates to work onsite every other week (all business days, M-F) in a Fidelity office. This does not apply to Remote or fully Onsite roles.

Certifications:

Category: Data Analytics and Insights

What does a JavaScript developer in web3 do?

A JavaScript developer in web3 would likely be responsible for developing applications and other software using the JavaScript programming language within the web3 ecosystem

Web3 refers to the third generation of web technology, which emphasizes the use of decentralized technologies such as blockchain and distributed ledger systems

This means that a JavaScript developer in web3 would need to be familiar with these technologies and how to use them in the development of applications and other software

They may also be responsible for maintaining and updating existing web3 applications, as well as working with other members of a development team to create new web3 applications.