Web3 Front End Developer Job at Childhood Cancer Society

Senior Front-end Engineer

We're making the world of digital assets accessible and secure for everyone. Joi...

Location

France , Paris

Salary:

Not provided

Ledger

Expiration Date

Until further notice

Requirements

Engineer profile with at least 5 years of experience in software development
Good knowledge of UI/UX practices in software development
Proficient with JavaScript and TypeScript
Strong experience in React.js development, tools and libraries
Good knowledge of testing strategies

Job Responsibility

Own from a technical standpoint the desktop and mobile development of Ledger Live Applications
Collaborate with our devs, QA, designers, and product within Ledger Live teams
Take initiative and offer technical solutions
Develop features using best practices from unit to e2e testing
Participate in code reviews
Be responsible for the quality of Ledger’s UI/UX framework
Mentor and promote tech growth within the team, helping to set high standards for the team
Work 100% on Open Source projects all gathered in our monorepo: ledger-live
Share knowledge within Ledger and beyond

What we offer

Equity: Employees are the foundation of our success, and we award stock options so you can share in that success as we grow
Flexibility: A hybrid work policy
Social: Annual company outing for Ledgerdary Days, plus frequent social events, snacks and drinks
Medical: Comprehensive health insurance policy offering extensive medical, dental and vision care coverage
Well-being: Personal development, coaching & fitness with our dedicated partners
Vacation: Five weeks of paid leave per year, in addition to national holidays and rest & relaxation (RTT) days
High tech: Access to high performance office equipment and gadgets, including Apple products
Transport: Ledger reimburses part of your preferred means of transportation
Discounts: Employee discount on all our products

Fulltime

Senior Crypto Developer

We are seeking a talented and driven Senior Crypto Developer to join our dynamic...

Location

Salary:

Not provided

gamdom

Expiration Date

Until further notice

Requirements

5+ years of backend development experience, including significant work with Node.js and TypeScript
Strong understanding of blockchain fundamentals, especially UTXO vs. account-based models
Hands-on experience with Ethereum, Bitcoin, and L2s (e.g., Arbitrum, Optimism, Polygon)
Familiarity with Web3 libraries such as ethers.js, web3.js, and experience interacting with RPC APIs
Deep understanding of secure wallet management practices and MPC technology
Proficiency in front-end development using React and Web3 provider integrations
Experience in designing high-availability systems and real-time transaction infrastructure
Strong emphasis on security, performance, and scalability
Excellent documentation and communication skills

Job Responsibility

Own backend micro-services in Node.js/TypeScript that interface with multiple blockchains, following clean-architecture and test-driven development principles
Run and optimize bitcoin-core (BTC/LTC) nodes, manage UTXO sets, fee estimation, mempool monitoring, and wallet RPCs for high-volume deposit and withdrawal flows
Build and maintain Ethereum transaction pipelines using ethers.js - handle ERC-20/ERC-721 token transfers, reorgs, transaction signing/broadcasting, and nonce management
Integrate additional L1/L2 networks by abstracting blockchain-specific logic behind a unified service layer, enabling rapid support for new tokens and chains
Leverage Fireblocks or similar MPC/custodial APIs to manage secure wallet operations, policy enforcement, and multi-signature approval flows
Develop and maintain frontend Web3 wallet integrations (e.g., MetaMask, WalletConnect, Ledger) using TypeScript/React, delivering seamless UX and real-time transaction feedback
Build scalable deposit & withdrawal infrastructure, including queueing systems, idempotent webhooks, reconciliations, wallet sweeps, address management, and fee optimization
Embed security and compliance features, KYT screening, whitelisting, secrets management, and rate-limiting into application code and CI/CD pipelines
Monitor blockchain health and system performance establish SLAs, create alerting systems, implement incident response plans, and lead post-mortems
Document APIs, architecture decisions, and operational runbooks

What we offer

A dynamic and supportive work environment
Opportunities for professional growth and development in a rapidly evolving industry
Competitive salary and performance-based incentives
The chance to work with a passionate team in the forefront of blockchain innovation

Front-End Engineer

Blockchain.com is connecting the world to the future of finance. As the most tru...

Location

France , Paris

Salary:

Not provided

Blockchain

Expiration Date

Until further notice

Requirements

At least 3 years of experience working with Front-End technologies, with a focus on React, NextJS and TypeScript
Strong software engineering fundamentals knowledge
Ability to write secure, maintainable, and testable Front-End code
Experience with blockchain technologies, cryptocurrencies, and Web3 development
Ability to independently manage the full lifecycle of tasks, and take ownership of the quality of your work
Excellent communication skills and collaborate effectively with team members across disciplines
Hands-on experience with Front-End architectures and automated testing is a plus

Job Responsibility

Be a part of Web Front-End team which oversees all Web UIs for consumer side of the business such as Wallet, DEX and crypto on-ramp
Maintain and continuously improve existing applications serving millions of users, as well as develop new ones for cutting-edge crypto solutions
Integrate both Web2 and Web3 technologies and APIs to enhance wallet and decentralized exchange (DEX) functionalities
Collaborate closely with designers, Back-End engineers, and business stakeholders to deliver a best-in-class user experience
Proactively collaborate with team members, sharing knowledge and ensuring efficient task distribution
Advocate for best practices, code quality, and test coverage, while driving technical discussions within the team

What we offer

Unlimited vacation policy
Unlimited books policy
Apple equipment
Learning and development opportunities in other areas than AML in the future
Full-time salary based on experience and meaningful equity in an industry-leading company
Work from Anywhere Policy: You can work remotely from anywhere in the world for up to 20 days per year

Fulltime

Sr. Full-Stack Engineer, Product

We’re looking for an experienced product-focused full-stack engineer to join our...

Location

United States

Salary:

175000.00 - 215000.00 USD / Year

Zora

Expiration Date

Until further notice

Requirements

4+ years of experience as a software engineer working on user-facing or product-centric systems
Strong experience building both front-end applications at scale (React, React Native, Next.js, TypeScript) and back-end systems & APIs (Node/TypeScript, GraphQL, or similar)
Ability to move fluidly across the stack: Front-end (React/React Native), Back-end (TypeScript/Node, GraphQL, Python), Smart contracts or on-chain logic (Solidity) — or a willingness to learn
A strong product sense and a user-first mindset
Comfort owning features from ideation through implementation and production support
Familiarity with or desire to learn crypto/web3 concepts
Desire to stay current with modern software best practices across full-stack development
MUST be located in a US Time Zone

Job Responsibility

Build and continuously improve trading-related features across web, mobile, backend services, and on-chain components
Design, build, and maintain APIs, services, and user interfaces that support high-scale trading and creation experiences
Own projects end-to-end—from system design to implementation, testing, rollout, and post-launch iteration
Work closely with PMs and Designers to shape product direction and ensure user needs are kept at the center
Participate in code reviews, RFCs, technical design discussions, and architecture planning
Collaborate with engineers across the stack, contributing wherever the product needs you most
Participate in on-call rotation and help maintain reliability of core trading surfaces
Communicate clearly with cross-functional stakeholders on status, risks, and milestones

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

Senior Full-Stack Engineer

Our client is an emerging tech company innovating in the digital asset and Web3 ...

Location

Salary:

120000.00 USD / Year

G2i Inc.

Expiration Date

Until further notice

Requirements

5+ years of professional software development experience
3+ years working in Web3 or blockchain-related projects
Strong expertise in React, TypeScript, and Node.js
Experience building and deploying cloud-based systems (AWS, GCP, or similar)
Understanding of smart contract integrations and blockchain fundamentals
Excellent communication skills in English
Must be based in LATAM

Job Responsibility

Design, build, and maintain scalable full-stack applications using React, TypeScript, and Node.js
Contribute to architecture decisions for front-end and back-end systems
Integrate with Web3 technologies (smart contracts, wallets, blockchain APIs, etc.)
Ensure performance, security, and reliability across distributed systems
Collaborate cross-functionally with design, product, and leadership
Participate in code reviews, technical discussions, and mentorship of junior engineers

What we offer

100% remote work with flexible hours
Opportunity to work on cutting-edge blockchain technology
Collaborative, international, and innovative culture

Fulltime

New

Operations Specialist III

As an Operations Specialist III, you will be the backbone of daily business unit...

Location

Canada , Toronto

Salary:

Not provided

Randstad

Expiration Date

April 27, 2026

Requirements

Elite Communication: Exceptional verbal and written communication skills
Analytical Mindset: Proven experience in Business Analytics and the ability to interpret complex data sets
Client Centricity: A strong focus on Customer and Client satisfaction
Technical Proficiency: Ability to navigate routine analytics tools and reporting software

Job Responsibility

Problem Resolution: Analyzing and researching issues within the business unit to provide swift, accurate resolutions
Implementation Support: Assisting with the rollout of new products, services, and operational solutions
Data Intelligence: Inspecting data to identify emerging trends and interpreting results to validate operational processes
Reporting: Creating routine analytics and detailed reports, including exception processing
Process Improvement: Supporting the design and documentation of new services while providing guidance on technical and procedural changes

What we offer

Best of Both Worlds: Start with comprehensive, 100% on-site training to get you up to speed, then transition to a Hybrid Work Model (3 days on-site, 2 days remote)
Prime Location: Work in the heart of Toronto surrounded by the energy of the financial district
Professional Growth: Gain exposure to complex financial products and high-level operational workflows
Networking: Build lasting relationships with industry partners and teammates in a collaborative setting

Fulltime

New

Finance analyst

We are seeking a detail-oriented Finance Analyst to join our team for a high-pri...

Location

Canada , Toronto

Salary:

Not provided

Randstad

Expiration Date

April 27, 2026

Requirements

1–2 years of experience in an accounting or finance-focused role
A Bachelor’s degree in Accounting, Finance, or a related field is preferred
Proficiency in JD Edwards (JDE) is a significant asset
Intermediate skills in Microsoft Excel (data entry, basic formulas)
Professional experience with Microsoft Outlook and general computer functions
Excellent written and verbal communication skills for managing vendor and client relations

Job Responsibility

Accounts Payable Management: Review and accurately code invoices
prepare and submit upload files for final approval
Software Oversight: Utilize JD Edwards (JDE) to check invoice statuses and track real-time financial data
Inquiry Management: Act as the primary point of contact for the generic mailbox, responding promptly to client and vendor inquiries regarding payments and billing
Reporting Support: Apply basic cash and accrual accounting fundamentals to help prepare and deliver complete financial reports
Administrative Excellence: Handle ad-hoc administrative tasks and monitor email communications to ensure no vendor or client request goes unanswered

What we offer

Fully Remote: Work from anywhere in Canada with a standard 9-5, Monday–Friday schedule
Career Growth: This assignment offers a 'foot in the door' with a global leader in real estate services, with a possibility for both extension and conversion to a permanent Full-Time Employee (FTE) status
Professional Exposure: Gain experience working on complex property portfolios and high-volume financial workflows
Streamlined Hiring: A quick interview process (1-2 virtual rounds)

Fulltime

New

Ap/ar specialist

We are seeking a highly detail-oriented and organized Accounts Payable & Account...

Location

Canada , Brampton

Salary:

27.00 - 30.00 CAD / Hour

Randstad

Expiration Date

April 26, 2026

Requirements

High school diploma or equivalent
Proven experience in Accounts Payable and Accounts Receivable roles
Strong attention to detail and excellent organizational skills
Strong written and verbal communication skills
Computer aptitude and MS Office skills
Intermediate proficiency in Excel, Word, and Outlook
Ability to handle multiple priorities in a fast-paced environment

Job Responsibility

Accounts Payable (AP) - 50%: Update and maintain accurate and up-to-date records of expenditures
Print weekly cheques for non-EFT/ACH vendors and ensure timely distribution
Respond to vendor invoices and promptly resolve any discrepancies
Ensure all payments adhere to company policy and are sent out on time
Resolve payment discrepancies and disputes with vendors
Set up payments to vendors in on-line banking as directed by the Supervisor
Accounts Receivable (AR) - 50%: Prepare weekly customer statement reports, primarily using Excel, for larger customers
Ensure timely distribution of customer statements, by email for smaller customers, at least once per month
Prepare and mail invoices to customers in a timely manner
Accurately post payments to customer accounts

What we offer

Unlimited Free Access to Udemy
Collaborative team environment
Easily accessible by public transit

Fulltime

Web3 Front End Developer

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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