Senior Software Engineer - Execution Team
Swirlds Labs
About Hashgraph:
Hashgraph is a fast-growing software company committed to supporting, developing and servicing Hedera, an open source, proof-of-stake platform. Hedera is EVM-compatible and has been specifically built to meet the needs of enterprise and Web3 applications, which require speed, security, stability and sustainability. Hedera’s public network is governed by industry-leading organizations, spanning 11 sectors and 14 regions who oversee the development and direction of the decentralized platform.
About The Team:
The Execution Team is one of the core teams that builds and maintains the Hiero Consensus Node, the heart of the Hiero Distributed Ledger Technology (DLT). Our team is responsible for delivering the Hiero native services, which include the Crypto, Token, Consensus, and File Services. We also own transaction processing, fee collection, rewards accounting, and distribution. Furthermore, the generation of records and blocks is part of our responsibility. Our team works primarily in Java, and our code is open source. We collaborate closely with internal and external partners to deliver a reliable, performant, scalable, secure, fault-tolerant, and developer-friendly platform.
About the role:
As a Senior Software Engineer on the Execution Team, you will be responsible for delivering software services, business logic, and APIs within the Hiero Consensus Node. You’ll work on deeply technical challenges involving distributed execution, state management, transaction lifecycles, and economic systems (fees, rewards, and penalties). You will work in a highly collaborative environment where innovation, trust, and ownership are key values. This is a high-impact role requiring deep passion for building the platform that powers next-generation decentralized applications.
You may find yourself doing all of the following:
- Design, develop, test, and debug core components of the execution layer
- Collaborate with cross-functional teams to define and deliver end-to-end functionality
- Optimize performance and scalability of the execution layer for high-throughput transaction workloads
- Ensure correctness, determinism, and reliability in service implementations
- Drive high standards in code quality, testing, and documentation
- Contribute to a culture of technical excellence and open-source collaboration
Qualification Requirements:
- 4+ years of professional software engineering experience
- Strong expertise in Java, with a deep understanding of concurrent programming and system performance
- Strong grasp of computer science fundamentals, including data structures, algorithms, concurrency, and design patterns
- Experience building and maintaining distributed systems at scale
- Experience with API design, particularly gRPC
- Strong problem-solving and debugging skills
- Excellent communication and collaboration skills
- Having a passion for code quality, system design, and doing things the right way
Other skills that are great to bring with you but that we can help you develop:
- Experience in distributed ledger Technologies (DLT) or blockchain platforms
- Exposure to security principles in distributed applications or cryptographic systems
- Familiarity with web3 tools or smart contract platforms (especially EVM)
- Experience with event-driven architectures or high-frequency trading systems
- Experience profiling and optimizing complex and concurrent systems