Senior Software Engineer - Special Projects

Status
Boston, USA
Full time
Remote
Compensation is not specified
Role
Software Engineer
Description

About the Company:

Circle operates as a financial technology company at the forefront of the emerging internet of money. Their focus is enabling the swift, cost-effective, global transfer of value similar to digital data. This advancement in internet infrastructure empowers enhanced possibilities for payments, commerce, and markets, aiming to boost worldwide economic prosperity and foster inclusion. Circle's infrastructure supports USDC, a blockchain-based dollar, allowing businesses, institutions, and developers to leverage these breakthroughs in the evolution of money and technology.

Role Overview:

At Circle, they prioritize transparency and stability as they expand into leading global jurisdictions. The emphasis lies on speed and efficiency for organizational success, with employees embodying values such as Multistakeholder, Mindfulness, Driven by Excellence, and High Integrity. Operating in a remote work setting, Circlers collectively propel team success through a culture of collaboration, flexibility, and diversity that values new ideas from all stakeholders.

Responsibilities:

Join Circle's USDC Smart Contract team as a skilled smart contract engineer to build and scale smart contracts for USDC across different blockchain protocols like Ethereum, Solana, and Cosmos. As a Senior/Staff Software Engineer, your leadership will be key in executing these responsibilities:

  1. Architect, develop, test, and deploy smart contracts that assure secure and seamless transactions.
  2. Enhance existing smart contracts to optimize developer productivity, safety, and overall efficiency.
  3. Implement security best practices and improve performance through optimization techniques.
  4. Evaluate risks associated with smart contract development on diverse blockchain platforms, identifying vulnerabilities and executing mitigation strategies for enhanced security and resilience.

Candidate Profile:

For Senior Software Engineer (III):

  • Over 4 years of professional software development background (including internships).
  • Minimum 2 years of experience in developing smart contracts on blockchain platforms.
  • Proficient in programming languages for non-EVM smart contracts like Rust, Go, among others.
  • Showcase of expertise in managing secure and efficient smart contracts deployment.
  • Demonstrated focus on implementing security best practices in smart contract development.
  • Stay informed on the latest trends in blockchain development to drive innovation.
  • Strong problem-solving skills with a proactive and data-driven approach to address challenges in smart contract development.
  • Ability to conduct independent research for resolving complex issues and devising innovative solutions.

For Staff Software Engineer (IV):

All the qualifications of a Senior Software Engineer, plus:

  • More than 7 years of professional software development background (including internships).
  • Over 4 years of experience in smart contract development on blockchain platforms.
  • Mastery in non-EVM programming languages and tech stacks.
  • In-depth understanding of blockchain technology principles and blockchain/web3 protocols.
  • Aptitude to lead technical teams, mentor junior engineers, and collaborate effectively with cross-functional teams.
  • Strong communication skills for building consensus among team members and stakeholders.

Additional Information:

  • Position eligible for day-one PERM sponsorship for qualified candidates.
  • Compensation ranges are determined based on various factors, including relevant experience and qualifications.
  • Generous total compensation packages including equity, benefits, discretionary vacation policy, paid sick leave, and holidays in the U.S.

Circle fosters an inclusive work environment and actively values diversity. They do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

Skills Required
Avatar
Circle
Company size
Not specified
Location
United States
Description
Not specified
Status

More Full-time Jobs

Show more

Senior web3 engineer

Treynor, USA
Treynor, USA
Part time
Remote
About the Project:
We’re building a SocialFi platform combining real estate and DeFi. After launching our MVP, we’re now progressing to version 2.
 
Role:
Join our remote team to develop website, smart contracts, integrate blockchain features, and ensure platform security.
 
Responsibilities:
- Develop and deploy smart contracts on Ethereum or Layer 2.
- Integrate wallet connect and decentralized features.
- Collaborate and direct contribute with frontend/backend teams.
- Conduct security audits.
 
Requirements:
- Experience with React, Ethers.js, Web3.js.
- Familiarity with wallet extensions and DeFi protocols.
- Ability to fix errors within 1 hour during tests.
- Comfortable working independently in a remote setup.
 
Nice to Have:
- Knowledge of cross-chain protocols or cryptography.
- Experience in social finance or real estate blockchain projects.
 
Application:
Send your resume and Linkedin profile. Selected candidates will do a quick coding test.
 
Contact: contact@hubsai.net
 
Join us to help shape the future of SocialFi!
 
Payment in Crypto
19,000-22,000
Monthly
See details

Junior / Middle Metaverse Developer (Unity / Web3 / VR)

Manzhouli, China
Manzhouli, China
Full time
Remote
We are looking for a Metaverse Developer to help build interactive virtual environments and immersive digital experiences. The role involves developing 3D worlds, integrating Web3 technologies, and working with modern tools for real-time applications.
You will work with Unity, WebGL, and blockchain technologies to create engaging metaverse features and optimize them for performance across different devices. The developer will collaborate with designers and backend engineers to deliver scalable and stable products.
Requirements include experience with Unity and C#, understanding of 3D development, Web3 or blockchain basics, and familiarity with Git and API integration. Experience with VR/AR, NFTs, or multiplayer systems is a plus.
We offer remote work, flexible hours, crypto payments, and the opportunity to build innovative metaverse products.
Payment in Crypto
1,500-3,500
Monthly
See details

Junior/Mid Decentralized Infrastructure Engineer

Full time
Remote
Role:
Help build and scale decentralized infrastructure: contribute to compute networks, protocols, storage layers, and orchestration tools that power AI agents and open digital systems. You’ll write code, run tests, fix bugs, and ship real features fast.
Skills & Requirements: 
1–3 years in blockchain infra, distributed systems, or high-scale compute (or strong personal projects) 
Solid Python / Rust / Go skills 
Interest in libp2p, IPFS, GPU orchestration, or decentralized compute 
Quick learner who ships clean code and loves performance/cost challenges
Salary:
$110,000 – $165,000 USD base + meaningful equity (portfolio startup) + full benefits + Sirex carry
Description:
Sirex.vc doesn’t just invest — we plug strong builders straight into our portfolio companies.
This is your chance to work on the real infrastructure behind autonomous agents and the open digital economy. Full support from the Sirex team, fast growth, zero bureaucracy.
High risk. Zero apologies.
Payment in Crypto
9,167-13,750
Monthly
See details

Web3 Fullstack Developer

Part time
Remote
🌐 About Us
Neonflick is a tech organization specializing in Web3 development.
We believe Web3 solutions are not as popular as they could be — mainly due to complexity. Our mission is to simplify the user experience and make decentralized technology more accessible and easy to use for everyone.
🚀 About the Role
We are looking for a Web3 Fullstack Developer who is passionate about decentralized technologies and excited to contribute to building meaningful Web3 products. You will work on developing new products, improving existing ones, and fixing bugs, all while proposing innovative ideas to enhance our platform.
🔹 Responsibilities
Develop functional and user-friendly Web3 products
Improve and optimize existing products and features
Identify and fix bugs or issues in the system
Propose and implement new ideas for product development
Collaborate with the team to ensure high-quality software delivery
🔹 Requirements
Strong interest in Web3 / blockchain / decentralized technologies
Fullstack development experience (frontend + backend)
Experience with smart contracts and decentralized frameworks is a plus
Problem-solving skills and attention to detail
Ability to work independently and proactively
🔹 What You Get
Early-stage involvement in a Web3 tech organization
Influence over product development and feature design
Opportunity to build experience and a portfolio in the Web3 space
Potential long-term collaboration and future compensation as the project grows
A chance to contribute to making Web3 simpler and more accessible
⚠️ Important
This is an unpaid position. We are looking for someone motivated by vision, learning, and long-term impact rather than immediate salary.
If you are passionate about Web3 and building meaningful decentralized products, we’d love to hear from you.

Junior AI Engineer

Full time
Remote
Role:
Join one of our fast-growing portfolio startups and help build simple AI features. You’ll work with large language models, create basic automations and chat tools, test ideas, fix small bugs, and integrate AI into everyday products.
Skills & Requirements: 
0–2 years of experience (fresh graduates or self-taught welcome) 
Basic Python knowledge 
Interest in AI, LLMs or chatbots (personal projects are a big plus) 
Quick learner who enjoys trying new things 
Good English for team communication
Salary: $95,000 – $135,000 USD base + equity in the startup + full benefits
Description:
Sirex.vc not only invests — we actively help our portfolio companies hire great people. This Junior AI Engineer role is inside one of our AI-native startups. You’ll get real hands-on experience, learn from the best, and build things users actually use — all with full support from the Sirex team.
High risk. Zero apologies.
Payment in Crypto
7,917-11,250
Monthly
See details