Blackbird Labs · 2 weeks ago
Senior Backend Engineer, Blockchain - New York, NY
New York, United States
Full-time
Onsite
Senior Level
$180K/yr - $220K/yr
5+ years expBlackbird Labs is a loyalty and payments platform that aims to revolutionize the restaurant industry. As a Senior Backend Engineer, you will bridge traditional fintech and blockchain technologies to build next-generation payments infrastructure, collaborating with various teams to define and execute the technical vision for crypto payments and loyalty platforms.
HospitalityInformation TechnologyLoyalty ProgramsWeb3
Responsibilities
Design, build, and maintain backend APIs that integrate blockchain transactions with traditional payment systems
Integrate on-chain wallet services, managing wallet lifecycle events, transactions, and user authentication
Implement secure and scalable solutions for on-chain payment flows, transaction signing, and state reconciliation
Work with smart contracts, blockchain oracles, and data providers to facilitate reliable on-chain interactions
Uphold and promote backend best practices with a focus on security, testing, and reliability
Mentor engineers and foster a collaborative, growth-oriented team culture
Participate in product and design discussions, providing backend and blockchain perspectives on implementation and feasibility
Qualification
Required
5+ years of experience building and deploying backend APIs
Strong proficiency in Kotlin or another statically typed JVM language
Working knowledge of Solidity, smart contract design, and EVM-based ecosystems
Experience designing RESTful APIs and distributed systems using domain-driven design principles
Familiarity with blockchain architectures, smart contract interactions, wallet authentication flows, and transaction signing
Strong attention to detail and commitment to delivering secure, high-quality user experiences
Comfortable working cross-functionally with product, design, and engineering teams
Preferred
Experience with Spring Boot, Hibernate, and asynchronous event-driven architectures
Familiarity with the U.S. payments ecosystem, including debit, credit, and ACH processing
Exposure to AWS infrastructure, Terraform, and CI/CD pipelines
Understanding of cryptographic primitives (signatures, hashing, key management)
Experience with embedded wallet SDKs (e.g., MetaMask, WalletConnect) or user identity systems (OAuth, Web3 login flows, Auth0)
Experience building in-app crypto wallets or integrating on-chain/off-chain loyalty systems
Benefits
Stock options
Benefits (including medical, dental, vision, flexible time off, 401(k))
Some not-so-standard, extra-fun perks
Company
Blackbird Labs
Blackbird is the loyalty company for restaurants, backed by A16Z, Union Square Ventures, Spark Capital, QED, American Express, Coinbase and others.
11-50 employees
H1B Sponsorship
Blackbird Labs has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (2)
2023 (1)
Funding
Current Stage
Growth StageTotal Funding
$85MKey Investors
Spark CapitalAndreessen Horowitz
2025-04-08Series B· $50M
2023-10-04Series A· $24M
2022-10-06Seed· $11M
Leadership Team
Ben Leventhal
Founder and CEO
Recent News
2026-01-07
globalventuring.com
2025-12-31
Company data provided by crunchbase