Job details

Senior Fullstack Engineer

Biconomy empowers Web3 developers to build seamless, user-friendly dApps that work effortlessly across multiple blockchains. Our battle-tested modular account and execution stack eliminates traditional UX friction points, helping projects accelerate user adoption while reducing development costs. By processing over 50 million transactions across the 300+ dApps we've served, we're powering the future of onchain economies.

The Role – Build the Protocol Powering the Future of Web3

As a Senior Fullstack Engineer on our Modular Execution Environment (MEE) team, you’ll help architect and scale the MEE protocol – a modular execution layer for advanced blockchain operations designed to horizontally scale blockchains in a multi-chain world. This is not just application development – you’ll be building foundational infrastructure that underpins decentralized, cross-chain supertransactions and smart account interactions.

You’ll work across the entire MEE stack:

MEE Protocol – Develop the decentralized network and cryptoeconomic systems, working on P2P communication, slashing mechanisms, and storage proofs.
MEE Network Infrastructure – Build the foundational infrastructure, from bundlers to validators, supporting the MEE protocol’s decentralization roadmap.
Backend & Indexers – Design complex systems to aggregate, index, and interpret on-chain and off-chain data, powering real-time cross-chain operations.
Implementing Supertransactions - Develop and refine a novel data type that defines cross-chain operations (EVM and non-EVM). Supertransactions aggregate multiple on-chain and off-chain interactions into a Merkle tree, enabling seamless, complex multi-chain execution.

What You Will Be Doing:

Protocol Development – Contribute to core MEE protocol components, including slashing mechanisms, cryptoeconomic design, and validator infrastructure.
Infrastructure Design – Build the backend infrastructure that facilitates MEE’s transition from centralized to fully decentralized P2P execution.
Indexers & Aggregation – Develop and optimize indexing services that process and aggregate data across multiple blockchains into abstract supertransaction models.
Cross-Chain Execution – Design systems to handle seamless cross-chain flows, enabling developers to execute complex, multi-chain transactions with minimal overhead.
Scalable Backend Systems – Implement scalable microservices, APIs, and backend solutions to support high-throughput, low-latency blockchain interactions.
Collaborate on Cutting-Edge Tech – Work with blockchain engineers, cryptographers, and product teams to integrate novel technologies like storage proofs, intent-based bridges, and gossip networks.

Requirements:

Experience: 3+ years of fullstack development with a focus on blockchain protocols, infrastructure, or decentralized networks.
Tech Stack: Proficiency in JavaScript/TypeScript, Node.js and Web3 frameworks (Ethers.js, viem).
Blockchain Expertise: Deep understanding in any of the following:
- Account Abstraction (AA)
- 4337 Bundlers
- Smart Accounts & EIP7702
- Storage Proofs (e.g., Herodotus)
- Intent-Based Bridges (e.g., Across, Connext)
- Cross-Chain Messaging (e.g., Axelar, LayerZero)
- Gossip Networks & P2P Systems
- Liquidity Fronting
- MEV, Flashbots & UserOps
- Merkle Trees, Sequencers & Rollups
Backend Mastery: Experience building high-performance, scalable infrastructure and working with decentralized architectures.
Collaborative Approach: Proven ability to work cross-functionally across protocol, backend, and product teams in a fast-paced, iterative environment.

Nice-to-Have:

Contributions to open-source blockchain infrastructure projects.
Familiarity with optimistic rollups, zk-rollups, or modular execution environments.
Experience developing validators, bundlers, or sequencers in a P2P blockchain environment.
Understanding of MEV mitigation, frontrunning, and cross-chain arbitrage solutions.
Familiarity with Rust and/or Go

What We Offer:

Flexible Working Hours: Enjoy autonomy over your schedule.
Generous Vacation Policy: 25 days vacation per year plus public holidays.
Competitive Salary: With regular performance reviews.
Token Allocation: Be rewarded with tokens as part of our compensation package.
Growth Opportunities: Be part of an exciting new project with significant career growth potential.
Innovative Work Culture: Join a team that’s at the cutting edge of Web3, AI, and DeFi, and help shape the future of the digital economy.
Fun and Engaging Team Activities: Game nights, virtual celebrations, and work retreats to keep things exciting.

At Biconomy, we believe in creating a diverse and inclusive workplace. We are committed to being an equal-opportunity employer, and we do not discriminate based on race, national origin, gender, gender identity, sexual orientation, disability, veteran status, age, or any other legally protected status.

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What You Should Know About Senior Fullstack Engineer, Biconomy

Join Biconomy as a Senior Fullstack Engineer, where you will play a key role in empowering Web3 developers to create user-friendly decentralized applications, or dApps, that can operate smoothly across various blockchains. At Biconomy, we're driven to eliminate the typical hurdles of user experience in Web3 with our innovative modular execution stack. Your responsibilities will encompass building the Modular Execution Environment (MEE) protocol that serves as the backbone for cross-chain supertransactions and smart account interactions. As part of our MEE team, you’ll contribute to both protocol development and network infrastructure, crafting decentralized protocols and complex backend systems. You’ll work on exciting technologies including slashing mechanisms, cryptoeconomic designs, and tools to optimize cross-chain operations. With your background of 3+ years in fullstack development and a solid grasp of blockchain protocols, you're perfectly positioned to collaborate with engineers, cryptographers, and product teams to push the frontiers of blockchain technology. You'll have the chance to implement scalable APIs and backend services that are crucial for real-time interactions. And we’re offering a flexible work environment that supports your professional growth and offers a generous vacation policy, competitive salary, and a fun, innovative culture where you can connect with colleagues through engaging team activities. If you're ready to shape the future of digital economies and work on cutting-edge tech at Biconomy, we can’t wait to hear from you!

Frequently Asked Questions (FAQs) for Senior Fullstack Engineer Role at Biconomy

What are the responsibilities of a Senior Fullstack Engineer at Biconomy?

As a Senior Fullstack Engineer at Biconomy, your main responsibility will revolve around architecting and scaling the Modular Execution Environment (MEE) protocol. This includes contributing to decentralized network components, refining backend infrastructure, and designing systems for seamless cross-chain execution. You'll engage in diverse tasks ranging from developing cryptoeconomic systems to optimizing microservices for high-throughput operations.