Senior Backend Engineer, Blackbird Labs
Blockchain
$180-220k
Restaurant-to-customer rewards app
Open for applications
Restaurant-to-customer rewards app
21-100 employees
Open for applications
$180-220k
21-100 employees
Company mission
To allow restaurants to identify, connect with, and reward guests, in meaningful and ongoing ways.
Role
Who you are
- We’re looking for someone who thrives in a fast-paced, high-ownership environment and is passionate about building products that seamlessly bridge the on-chain and off-chain worlds
- 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
Desirable
- 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
What the job involves
- As a Senior Backend Engineer, you’ll bridge traditional fintech and blockchain technologies to build our next-generation payments infrastructure. You’ll collaborate with product managers, designers, and fellow engineers to define and execute the technical vision behind our crypto payments and loyalty platforms
- You’ll shape key architectural decisions, establish engineering best practices, and help scale secure, user-friendly Web3 payment experiences
- 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
Our take
Reward and customer loyalty programs are a powerful way for hospitality venues to incentivese repeat visits, with most diners likely to spend more when a restaurant offers some form of reward. Blackbird Labs is a hospitality-focused loyalty and membership app designed to help restaurants build stronger, more personalized relationships with their customers through rewards and exclusive perks.
Beyond rewards, Blackbird's Web3 platform allowa membership options for consumers and provides restaurants with valuable analytics, helping them identify their most loyal customers and better understand preferences.
On top of this, the platform has also partnered with Privy to embed a digital wallet directly within the app. And following 2025 funding, Blackbird is set to launch its newest product, a cross-restaurant "points" service called Blackbird Club. As well as this, its recently expaned into new areas, including San Francisco, Charleston, and SOuth Carolina.
Freddie
Company Specialist at Welcome to the Jungle
Company
Funding (last 2 of 3 rounds)
Apr 2025
$50m
SERIES B
Oct 2023
$24m
SERIES A
Total funding: $85m
Company HQ
SoHo, New York, NY
Leadership
Ben Leventhal
(Founder & CEO)Previously co-founded Resy where they served as CEO and GM/VP, now he now serves as a Strategic Advisor at the company.
Salary benchmarks
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