Senior Software Engineer - Special Projects
Circle is a cutting-edge fintech company operating within the realm of the evolving internet of money. Our innovative approach enables the seamless transfer of value globally, promptly, and affordably compared to traditional settlement systems. Through our groundbreaking technology, we are expanding opportunities for payments, e-commerce, and financial markets to foster economic growth and inclusivity on a global scale.
Joining our team means being part of a company dedicated to transparency and stability. As we grow, we are extending our operations into some of the world's most robust jurisdictions. Our employees uphold our core values of Multistakeholder, Mindfulness, Driven by Excellence, and High Integrity. Working remotely, our team members thrive in a collaborative environment that encourages fresh perspectives and fosters a sense of ownership.
We are seeking a skilled and experienced smart contract engineer to join our USDC Smart Contract team at Circle. As a Senior/Staff Software Engineer, you will take the technical lead in designing and expanding smart contracts for USDC across various blockchain protocols such as Ethereum, Solana, and Cosmos.
Your responsibilities will include:
- Designing, coding, testing, and deploying secure smart contracts for smooth transactions.
- Improving existing smart contracts to enhance developer productivity, safety, and efficiency.
- Implementing top-tier security practices and performance optimization techniques.
- Conducting risk assessments to identify and address vulnerabilities in smart contracts on diverse blockchain platforms for improved security and robustness.
For a Senior Software Engineer (III), the ideal candidate should have:
- A minimum of 4 years of software development experience (including internships).
- 2+ years of proven expertise in smart contract development on blockchain platforms.
- Proficiency in programming languages suitable for non-EVM smart contracts (e.g., Rust, Go).
- In-depth knowledge of one major non-EVM blockchain ecosystem like Solana or Cosmos.
- Strong focus on architecture, coding, testing, and deploying secure and efficient smart contracts.
- Familiarity with the latest trends in blockchain development to drive innovation.
Requirements specific to a Staff Software Engineer (IV) include all those of a Senior Software Engineer, plus:
- Over 7 years of professional software development experience (including internships).
- 4+ years of hands-on experience in smart contract development on blockchain platforms.
- Expertise in non-EVM programming languages and tech stacks.
- Profound understanding of blockchain technology and various protocols.
- Strong leadership skills to guide technical teams and collaborate effectively.
Both positions are eligible for day-one PERM sponsorship for qualified candidates, and compensation is based on factors like experience and qualifications. Additionally, Circle is committed to fostering an inclusive work environment and offers a competitive compensation package that includes equity, medical, dental, vision, 401(k), vacation policy, sick leave, and multiple paid holidays. Industry Security Practices Best Practices C++ Cybersecurity LOC Token Rewards Multistakeholder eCommerce Policies Pricing.value Merchant Support Engineering Coding Accessibility Safe Checkout Buyer Support.EntityFrameworkCore integrations Seller Facing Revenue.png}.{MongoDB}How to Apply Join us as we create a more transparent and accessible financial future. Apply now to be part of a diverse and inclusive team that values innovation, collaboration, and integrity at its core.
I am looking for an Android developer to work on a project using Firebase Studio with Dart.
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I need an SEO expertteam who is capable of getting our shops to Google first page rank on our desired keywords
Have you built token launch platforms or bonding curves on Solana before?
Technical Cofounder – Mobile App Lead (Equity Role)
Equity + Leadership Role | Remote | Africa-focused
We’re building something bold — a platform designed to empower everyday people through real-world commerce and daily utility. The concept is built, the community is growing, and the brand is already in motion. Now, we’re ready to build the MVP.
We’re looking for a technical cofounder — someone with the skill to build and the vision to lead.
What You’ll Own:
• Lead the mobile app development (Android-first; iOS optional for now)
• Build core features: user registration, listings, wallet logic, escrow integration, and payments
• Collaborate on product direction and tech decisions
• Scale with the company as a core part of the founding team
Ideal Experience:
• You’ve built marketplace-style or P2P mobile apps before
• You’re comfortable with payment APIs like Paystack, Flutterwave, or others
• You understand how to work with wallets, escrow flows, and multi-user platforms
• You’re not just a builder — you want to grow with a brand and own a meaningful slice of it
Your Role Is Not Freelance.
This is a cofounder opportunity — you’ll help shape the product, tech stack, and long-term vision. You’ll receive equity and work closely with the founding team to build a scalable African-first product.
Venture Fellow (Part-Time, Remote)
Iron Key Capital is an investment firm specializing in liquid and venture opportunities in the crypto space. We invest in pre-seed and seed-stage Web3 startups focused on enterprise adoption of utility-driven digital assets. Additionally, we operate a blockchain innovation lab and incubate startups within the Web3 infrastructure sector. Backed by 200+ LPs globally, Iron Key deploys over $1M annually.
Role Overview:
The Venture Fellow program is an 8-week, part-time, remote opportunity designed for individuals eager to develop their skills in venture capital and angel investing. Fellows will gain hands-on experience in early-stage investing, including deal sourcing, due diligence, and pitching investment opportunities.
This program is ideal for aspiring investors, founders, or professionals exploring a career shift into venture capital. Fellows will work closely with seasoned venture capitalists and gain access to Iron Key’s investor community to learn best practices in the field.
Key Responsibilities:
Identify and evaluate early-stage investment opportunities in the Web3 ecosystem.
Conduct market research and due diligence on potential investments.
Collaborate with the Iron Key team on deal sourcing and portfolio management.
Engage with investors and team members to develop investment strategies.
Contribute to thought leadership on topics related to venture capital and Web3 innovation.
Qualifications:
Strong analytical and problem-solving skills to evaluate investment opportunities.
Excellent communication and interpersonal skills for engaging with team members and stakeholders.
Experience in Web3, AI, or related technologies is preferred.
Involvement in startups, entrepreneurial ecosystems, or Web3 communities is a plus.
Aspiring to transition into venture capital or professionalize angel investing skills.
Bonus: Previous experience as a founder or working within early-stage startups.
Program Details:
Duration: 8 weeks (part-time)
Location: Remote
Compensation: Competitive, based on experience
How to Apply:
Submit your application through this link:
https://airtable.com/appfCDlkorF5FL3VZ/pagnjuRX1A7gZjBGc/form
Additional Information:
This program is designed to take the guesswork out of breaking into venture capital or professionalizing angel investing. Successful Fellows may have opportunities to advance into Venture Partner or Core Contributor roles at Iron Key.