Principal Software Engineer - Java

Remote

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 role:

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.

Create a Job Alert

Interested in building your career at Hashgraph? Get future opportunities sent straight to your email.

Apply for this job

*

indicates a required field

Resume/CV*

Accepted file types: pdf, doc, docx, txt, rtf

Cover Letter

Accepted file types: pdf, doc, docx, txt, rtf

Education

Select...
Select...
Select...

Please note the items from the question you do NOT have professional experience with. 

Select...

Voluntary Self-Identification

For government reporting purposes, we ask candidates to respond to the below self-identification survey. Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiring process or thereafter. Any information that you do provide will be recorded and maintained in a confidential file.

As set forth in Hashgraph’s Equal Employment Opportunity policy, we do not discriminate on the basis of any protected group status under any applicable law.

Select...
Select...
Race & Ethnicity Definitions

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection. As a government contractor subject to the Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measure the effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categories is as follows:

A "disabled veteran" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service-connected disability.

A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.

Select...

Voluntary Self-Identification of Disability

Form CC-305
Page 1 of 1
OMB Control Number 1250-0005
Expires 04/30/2026

Why are you being asked to complete this form?

We are a federal contractor or subcontractor. The law requires us to provide equal employment opportunity to qualified people with disabilities. We have a goal of having at least 7% of our workers as people with disabilities. The law says we must measure our progress towards this goal. To do this, we must ask applicants and employees if they have a disability or have ever had one. People can become disabled, so we need to ask this question at least every five years.

Completing this form is voluntary, and we hope that you will choose to do so. Your answer is confidential. No one who makes hiring decisions will see it. Your decision to complete the form and your answer will not harm you in any way. If you want to learn more about the law or this form, visit the U.S. Department of Labor’s Office of Federal Contract Compliance Programs (OFCCP) website at www.dol.gov/ofccp.

How do you know if you have a disability?

A disability is a condition that substantially limits one or more of your “major life activities.” If you have or have ever had such a condition, you are a person with a disability. Disabilities include, but are not limited to:

  • Alcohol or other substance use disorder (not currently using drugs illegally)
  • Autoimmune disorder, for example, lupus, fibromyalgia, rheumatoid arthritis, HIV/AIDS
  • Blind or low vision
  • Cancer (past or present)
  • Cardiovascular or heart disease
  • Celiac disease
  • Cerebral palsy
  • Deaf or serious difficulty hearing
  • Diabetes
  • Disfigurement, for example, disfigurement caused by burns, wounds, accidents, or congenital disorders
  • Epilepsy or other seizure disorder
  • Gastrointestinal disorders, for example, Crohn's Disease, irritable bowel syndrome
  • Intellectual or developmental disability
  • Mental health conditions, for example, depression, bipolar disorder, anxiety disorder, schizophrenia, PTSD
  • Missing limbs or partially missing limbs
  • Mobility impairment, benefiting from the use of a wheelchair, scooter, walker, leg brace(s) and/or other supports
  • Nervous system condition, for example, migraine headaches, Parkinson’s disease, multiple sclerosis (MS)
  • Neurodivergence, for example, attention-deficit/hyperactivity disorder (ADHD), autism spectrum disorder, dyslexia, dyspraxia, other learning disabilities
  • Partial or complete paralysis (any cause)
  • Pulmonary or respiratory conditions, for example, tuberculosis, asthma, emphysema
  • Short stature (dwarfism)
  • Traumatic brain injury
Select...

PUBLIC BURDEN STATEMENT: According to the Paperwork Reduction Act of 1995 no persons are required to respond to a collection of information unless such collection displays a valid OMB control number. This survey should take about 5 minutes to complete.