Senior Java Engineer - Layer-1 Blockchain

Senior Java Engineer - Layer-1 Blockchain
I'm working with a Layer-1 blockchain company building its core systems from the ground up. The team is small and senior, and this role will have a direct impact on the architecture and performance of the network.
Responsibilities
You may be doing all of the following:

• Inventing new protocols, data structures, and algorithms to solve novel problems
• Designing and writing low-latency, high-throughput Java systems from scratch
• Tuning memory usage to the byte and measuring performance to the nanosecond
• Writing parsers, interpreters, and other core infrastructure from first principles
• Mentoring engineers and leading complex technical initiatives
• Creating tools and profilers to measure and improve execution across the stack
• Making design decisions that affect the correctness of a public ledger
• Moving between system-level design and single-instruction-level optimization
• Building tests and harnesses that ensure long-term stability

Requirements

• 10+ years of professional software development experience
• Deep expertise in Java and the JVM (memory model, threading, GC, profiling)
• Experience with parsers, interpreters, compilers, or other language tooling
• Proven ability to write and optimize high-performance code with minimal dependencies
• Strong foundation in algorithms, data structures, and concurrency
• Significant experience building systems where performance and correctness are critical
• Ability to build from scratch with just an IDE and the JDK
• Hands-on with tools such as JMH, PBJ, async-profiler, JFR, Solo, YourKit, or similar
• Passion for code quality, system design, and correctness
• Master's degree in Computer Science (or equivalent experience)

Nice to have

• Experience in distributed systems and/or blockchain
• Knowledge of cryptographic primitives (hashes, public/private keys)
• Familiarity with Web3 tools or smart contract platforms (especially EVM)
• Background in event-driven architectures or high-frequency trading systems
• Understanding of test-driven development and CI practices

Note
This is a challenging role. It requires engineers who enjoy solving deep technical problems and building systems where every line of code matters.
If this is you - and you live in US, Europe, or main centres then send me a CV which fits the above JD to simon@cryptorecruit.com  
If your CV is a fit - I'll be in touch!