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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.
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: Advanced knowledge of Java Core technologies and the Spring framework
- Data Mastery: Proficiency with SQL databases, ensuring optimal performance, structure, and replication
- Concurrency & Async programming: advanced understanding and hands-on experience in asynchronous programming methods.
- Events streaming: Understanding of the event driven architecture (Kafka or similar solutions).
- Operational Proficiency: Understanding and hands-on experience with Ops activities, Kubernetes, pipelines, Fit Flow and modern CI/CD patterns and strategies
- AI tools: 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: Effective communication skills, especially with teams responsible for security, operations and product
- Analytical thinking: Ability to tackle and investigate complicated problems and convert it to the task
- Adaptability to Rapid Changes: Demonstrated capability to adjust to quick technological shifts and evolving business requirements
- Ownership and Accountability: 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: 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.
Apply for this job
Is Kubernetes high demand?
Yes, Kubernetes is currently in high demand in the technology industry
Kubernetes is an open-source container orchestration platform that is widely used for deploying, scaling, and managing containerized applications
It provides a standardized way to manage and automate the deployment of containerized applications across multiple hosts and provides benefits such as reliability, scalability, and flexibility
As more and more organizations move towards containerized architectures, Kubernetes has become a critical component of their infrastructure
Kubernetes is used by companies of all sizes, from startups to large enterprises, and across various industries, including finance, healthcare, and e-commerce
According to various job market and salary surveys, Kubernetes-related skills are in high demand, and job positions related to Kubernetes are growing at a rapid pace
In fact, Kubernetes is often listed as one of the top skills that are in high demand by technology companies
Overall, Kubernetes is a highly sought-after skill in the technology industry, and it's likely to remain in high demand in the foreseeable future as more and more organizations adopt containerization and cloud-native architectures.