Blockchain Full Stack Engineer

About Polygon Labs

Polygon Labs is a software development company building and developing a network of aggregated blockchains via the Agglayer, secured by Ethereum. As public infrastructure, the Agglayer will bring together user bases and liquidity for any connected chain, and leverage Ethereum as a settlement layer. Polygon Labs has also contributed to the core development of several widely-adopted scaling protocols and tools for launching blockchains, including Agglayer CDK, Polygon PoS & Katana.

Your Role

As a founding Full Stack Engineer on the Polygon Fintech Labs team, you’ll work hand-in-hand with our Engineering Manager to build the foundation of our Financial Service application layer. Together, you’ll collaborate closely with product and design from day one to architect and ship high-impact features that bring real-world financial utility to millions of users.

You’ll build everything from backend services and wallet integrations to clean, intuitive user experiences that abstract away blockchain complexity — making stablecoin payments, programmable flows, and financial automation simple, secure, and accessible.

If you thrive on solving tough technical challenges and care deeply about creating polished user experiences, this is your opportunity to make a lasting impact at the intersection of crypto and fintech.

Your Responsibilities

• Implement wallet and transaction features that enable stablecoin payments, cross-chain bridging, and programmable flows.

• Integrate third-party wallet SDKs and APIs from key partners like Crossmint to support onboarding, compliance flows, and seamless fiat on/off ramps.

• Develop robust backend infrastructure and services to enable secure transaction execution, smart contract interactions, and vault access.

• Collaborate closely with smart contract engineers to connect on-chain logic with performant backend and frontend systems.

• Work side-by-side with frontend engineers to deliver secure, fast, and delightful user experiences.

• Contribute to architectural decisions that prioritize scalability, security, code quality, and system reliability across the stack.
  

What You’ll Need

• 4+ years of full stack engineering experience, ideally in crypto, fintech, or API-intensive environments.

• Strong proficiency with modern TypeScript and frameworks such as Node.js, NestJS, or similar.

• Hands-on experience integrating third-party SDKs (wallets, bridges, KYC tools) into production-grade systems.

• Solid understanding of Ethereum and EVM-compatible smart contracts and how to interact with them via backend/frontend code.

• Familiarity with secure key management systems, vault integrations, or encrypted storage solutions.

• Proven ability to ship clean, maintainable, production-ready code in a fast-paced, collaborative setting.

  
  

Preferred Qualifications

• Experience working with smart contract wallets or account abstraction flows.

• Background building scalable backend services for mobile-first applications.

• Knowledge of cross-chain bridging technologies and relayer infrastructure.

Polygon Labs Perks

The goal of the Polygon Labs total rewards program is to support the health and well-being of you and your family. Our comprehensive compensation plan includes the following benefits for our full time employees:

• Remote first global workforce

• Industry leading Medical, Dental and Vision health insurance*

• Company matching 401k with 3% match*

• $1,500 Home Office Set Up Allowance (life-time max)

• $200 Annual Book Allowance Program

• $75 Monthly internet or phone reimbursement

• Flexible Time Off

• 1 company wide wellness Friday day off per quarter

• Company issued laptop

• Egg freezing, mental health, and employee wellness benefits

*In certain countries medical, dental and vision is fully covered for employees & their dependents. This is country and plan specific.

*401k is for United States employees only

Polygon Labs is committed to a diverse and inclusive workplace and is an equal opportunity employer. We do not discriminate on the basis of race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or other legally protected status. Polygon Labs is committed to treating all people in a way that allows them to maintain their dignity and independence. We believe in integration and equal opportunity. Accommodations are available throughout the recruitment process and applicants with a disability may request to be accommodated throughout the recruitment process. We will work with all applicants to accommodate their individual accessibility needs.

If you think you have what it takes, but don't necessarily meet every single point on the job description, please still get in touch. We'd love to have a chat and see if you could be a great fit.

Learn More about Polygon Labs

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