Software Engineer (Java Generalist)

Job Description

Job Description

Career Renew is recruiting for one of its clients a Software Engineer (Java Generalist) - this is a fully remote role for US-based or Europe based candidates (if happy to overlap with EST working hours). Salary range : 160-200K USD yearly plus benefits.

Are you the kind of engineer who sees performance ceilings as a personal challenge, not a constraint? Do you get more satisfaction from squeezing 30% more throughput out of clean Java than from renting 30% more cloud? Do you dream of writing elegant, handcrafted code that stands the test of time and inspection? If that sounds like you, keep reading.

We’re building technologies that haven’t been built before. We're not gluing off-the-shelf components together; we're inventing systems from scratch that must be fast, small, correct, and built to last. Every line of code matters because it deals with people’s money and gets recorded publicly on an immutable ledger.

In a world where most engineers are encouraged to "move fast and break things," we’re a rare company where correctness, performance, and efficiency are the business model. Like NASA engineers launching rockets on 16-bit computers, we move fast and get it 100% right the first time.

This is a rare opportunity to be part of a small, elite team where you won’t be a tiny cog in a vast machine–you’ll be the person building the machine. If you're an engineer who loves puzzles, gets excited by new challenges, and wants to write software that really matters, this is the role for you.

You may be doing all of the following :

Inventing new protocols, data structures, and algorithms to solve problems no one else has tackled before

Designing and writing low-latency, high-throughput Java systems from scratch

Tuning memory usage down to the byte, and measuring performance down to the nanosecond

Writing parsers, interpreters, and other core infrastructure from first principles

Mentoring senior and staff engineers while leading complex technical initiatives

Creating tools and profilers to measure and improve execution across the stack

Making design decisions that will affect the architecture and correctness of a publicly visible ledger

Switching fluently between system-level design and single-instruction-level optimization

Building tests and harnesses that help ensure nothing ever breaks, ever

Qualification Requirements :

10+ years of professional software development experience

Deep mastery of Java and the JVM : memory models, threading, GC behavior, and performance profiling

Experience with parsers, interpreters, compilers, or other language tooling

Demonstrated ability to write and optimize high-performance code with minimal dependencies

Strong grasp of computer science fundamentals such as data structures, algorithms, concurrency, etc.

Significant experience building systems where performance and correctness are non-negotiable

Ability to build from scratch–given just an IDE and the JDK, you can deliver a working, high-performance server

Experience with tools like JMH, PBJ, async-profiler, JFR, Solo, YourKit, or similar

Having a passion for code quality, system design, and doing things the right way

Master’s degree in Computer Science (or equivalent experience)

Other skills that are great to bring with you but that we can help you develop :

Experience in distributed systems and / or blockchain

Knowledge of cryptographic tools, libraries, and primitives (e.g., hashes, public / private keys)

Familiarity with web3 tools or smart contract platforms (especially EVM)

Experience with event-driven architectures or high-frequency trading systems

Understanding of test-driven development and continuous integration practices

Let us be blunt; this is not an easy job. It’s not for those who want to tick boxes or copy and paste code from Stack Overflow. But if you love crafting brilliant systems, solving deep technical puzzles, and building something that truly matters, it may just be the best job you’ll ever have.

Come build the future with us as we accelerate the digital economy.