Senior Backend Engineer, Blackbird
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 bridge the gap between restaurants and customers 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 brilliant way to incentivise repeat customers for hospitality venues, with the majority of diners likely to spend more at a restaurant if it offers some sort of reward scheme. Blackbird is an app designed to foster the relationship between businesses and their customers with access to rewards and perks.
Alongside rewards, Blackbird's Web 3.0 platform supports membership options for consumers, and analytics for restaurants to know their best customers and understand their preferences such as where they like to sit. It has also partnered with Privy to embed a wallet within the app, whilst 2023 funding is helping the company build out new projects including a referral program and a payments and rewards platform.
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 benefits
- Stock options
- Medical, dental, vision, life and disability coverages
- Flexible vacation
- Parental leave program
- We also offer some not-so-standard, extra-fun benefits
Company HQ
SoHo, New York, NY
Leadership
Ben Leventhal
(CEO & Founder)Previously Co-founder and CEO at Resy where they are now a Strategic Advisor. Also a Strategic Advisor for Cookin.
Salary benchmarks
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