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capital.com
$36k - $100k estimated
Java Software Engineer (Crypto Focused)
Sofia City, Bulgaria / Limassol, Cyprus / Warsaw, Mazowieckie, Poland
Product & Engineering – Product /
Hybrid /
Hybrid
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We are a leading trading platform that is expanding to the four corners of the globe. Our top-rated products have won prestigious industry awards for their cutting-edge technology and seamless client experience. We deliver only the best, so we are always in search of the best people to join our ever-growing talent team.Â
We are currently growing our Backend Team and looking for great Engineers with an interest in trading to join us! Our Engineering team plays a pivotal role in ensuring the robustness, speed, and security of our product. Dedicated to enhancing performance, providing a best-in-class user experience, ensuring compliance, and safeguarding data, the team's efforts directly impact our ability to offer clients a seamless and secure trading journey.
We believe great engineering talent not only delivers excellent code, but also lives our values. We are looking for someone who is eager to go fast, willing to innovate and grow, who knows how to listen, respect and support, strives to exceed client expectations, and takes full ownership to achieve real results.
Core responsibilities:
- Design and build scalable, low-latency, and high-performance backend services
- Develop distributed and asynchronous systems ensuring reliability and fault tolerance
- Optimise performance across JVM, databases, caching, and networking layers
- Apply security best practices in handling client PII and financial transactions
- Use event-driven architectures and modern messaging solutions (e.g. Kafka)
- Collaborate with cross-functional teams to align architecture with business needs
- Maintain high code quality through testing, code reviews, and CI/CD practices
- Leverage AI tools to accelerate development, testing, and delivery
Additional core responsibilities (crypto focused):
- Design and build backend systems for custody, wallet services, staking, and trading.
- Implement secure key-management and transaction-signing workflows (multisig, MPC, HSM).
- Integrate with blockchain nodes, custody providers, CEX/DEX APIs, and staking protocols.
- Support the integration of third-party staking service providers and manage the associated workflows, including delegation, monitoring, and reward distribution.
What you will need: Experience & domain knowledge:
- Proven experience in FinTech, Banking, or related financial domains
- Strong understanding of distributed systems architecture and the client–server model
- Ability to design and maintain scalable, low-latency, high-performance systems
- Solid knowledge of concurrency, multithreading, and asynchronous programming
- Awareness of security best practices in handling PII and financial transactions
- Basic understanding of network protocols and troubleshooting
- Experience working in a product-led fast-paced environment as a team player
Additional experience & domain knowledge (crypto focused):
- Strong understanding of blockchain fundamentals: consensus, mempool, finality, gas mechanics, security considerations, and transaction lifecycles.
- Hands-on experience with major chains (e.g., Ethereum, Bitcoin, Solana, Cosmos, Polygon).
- Deep experience with wallet systems, key management, multisig/threshold signatures, hot/cold wallet architecture, and secure signing pipelines.
- Experience with custody platforms (Fireblocks, BitGo, Ledger Enterprise, Copper) or building custody-grade internal wallet infrastructure.
- Practical experience with staking/validator operations, including rewards, uptime, monitoring, and slashing mitigation.
Technical skills:
- Java and Spring:Â Advanced knowledge of Java Core technologies and the Spring framework
- Data Mastery:Â Proficiency with SQL databases, ensuring optimal performance, structure, and replication
- Concurrency & Async programming:Â advanced understanding and hands-on experience in asynchronous programming methods.
- Events streaming:Â Understanding of the event driven architecture (Kafka or similar solutions).
- Operational Proficiency:Â Understanding and hands-on experience with Ops activities, Kubernetes, pipelines, Fit Flow and modern CI/CD patterns and strategies
- AI tools:Â ability to effectively use AI technologies in engineering work e.g. applying AI for coding assistance, debugging, testing, documentation, and optimisation of workflows
Soft skills:
- Communication:Â Effective communication skills, especially with teams responsible for security, operations and product
- Analytical thinking:Â Ability to tackle and investigate complicated problems and convert it to the task
- Adaptability to Rapid Changes:Â Demonstrated capability to adjust to quick technological shifts and evolving business requirements
- Ownership and Accountability:Â Readiness to take ownership of tasks, issues as well as demonstrate accountability of the results and outcome
Nice to have:
- Performance: Knowledge of JVM performance optimization practices
- No-SQL:Â Experience working with no-SQL databases is a big plus
- In-memory storage: Strong knowledge of in-memory cache solutions
- Familiarity with double-entry accounting
- Understanding of DeFi protocols, liquidity mechanisms, yield strategies, or governance systems.
- Exposure to MEV concepts, transaction simulation, or on-chain execution optimization.
What you will get in return:
- Competitive salary and annual performance-based bonus
- Generous annual leave policy
- Health insurance and pension fund, with additional benefits depending on location
- Hybrid working model (3 days from office) or fully remote across the country of employment
- Workation policy (30 days remote from anywhere in the world)
- Two additional paid days per year dedicated to volunteering
Be a key player at the forefront of the digital assets movement, propelling your career to new heights! Join a dynamic and rapidly expanding company that values and rewards talent, initiative, and creativity. Work alongside one of the most brilliant teams in the industry.
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How do I get a job at DeFi?
Getting a job in the DeFi (decentralized finance) industry can be a competitive process, but there are a few steps you can take to increase your chances of finding a job in this field:
- Build up your skills and knowledge: To work in DeFi, you'll likely need to have a strong understanding of blockchain technology, as well as other related technologies such as smart contracts and cryptocurrency. Consider taking online courses or earning a degree in a relevant field to build up your skills and knowledge.
- Network with industry professionals: Attend meetups and conferences related to DeFi and make connections with professionals in the industry. Networking can be a valuable way to learn about job openings and get your foot in the door at a DeFi company.
- Create a strong online presence: Many DeFi companies will look at your online presence (such as your LinkedIn profile and personal website) when considering you for a job. Make sure to showcase your skills and accomplishments online and keep your profile up to date.
- Apply for relevant job openings: Keep an eye out for job openings at DeFi companies and apply for positions that align with your skills and experience. Apply for DeFi Jobs without Experience. Tailor your resume and cover letter to the specific job you're applying for and highlight any relevant experience or skills you have.
- Consider internships or volunteer work: DeFi Internships or volunteer work can be a great way to get your foot in the door and gain valuable experience in the DeFi industry. Many companies also offer internships to students, so consider applying for an internship if you're still in school.
- Be persistent: keep trying if you don't get a job right away. It can take time to find the right opportunity, but with the right skills and determination, you can land a job in the DeFi industry.