Principal Software Engineer - Java
Swirlds Labs
Software Engineering
Remote
Posted on May 31, 2025
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.
Qualification Requirements:
- 10+ years of software development experience
- Hotspot JVM or GraalVM experience
- Experience with compilers, parsers, interpreters, and garbage collectors
- Experience with performance, static code, and data-flow analysis
- Excellent debugging, critical thinking, and interpersonal skills
- Expertise in the plain vanilla Java programming language, VM, and its ecosystem of libraries and tools
- Mastery of the building blocks of JVM, with comfort using Java without large frameworks
- Familiarity with high-performance architectural systems and design patterns
- Experience in a tech or team lead role with the ability to guide engineers up to the Staff level
- Strong grasp of Computer Science fundamentals, including concurrency, performance optimization, and reusability
- Strong engineering principles and processes aimed at developing simple, modular, testable, and high-quality code
- Familiarity with test-driven software development processes and continuous integration tools and systems
- Master’s degree in Computer Science or a similar field, or equivalent work experience
- Ability to work at the big picture level and the deep line of code level, as well as switching between those
- Experience working on creating new things, besides taking off-the-shelf components and bolting them together
- Being comfortable given an IDE and Java with no 3rd party libraries to write a high-performance HTTP2 server in a month
- Experience performance-turning applications, ideally in a world where nanoseconds matter
- Experience with tools like JProfiler, YourKit, async profiler, JMH, etc.
Other skills that are great to bring with you but that we can help you develop:
- Experience with distributed open-source application development
- Knowledge of blockchain/DLT technology ecosystem
- Familiarity with security principles and cryptographic tools and libraries
- Experience writing and debugging smart contracts for an EVM-based ledger
- Experience with web3 tools written in JavaScript or TypeScript
- Knowledge in Data streams, event-driven architecture
- Understanding of performance primitives like hashes and public/private key pair signing in terms of how they are used as the building blocks of trust systems
- Experience with High Frequency Trading systems in Java