Senior Back-End Developer, Engineering (Java / Kotlin)

About Echo BaseEcho Base is a privately funded investment platform focused on special situations and strategic opportunities within the digital asset ecosystem. We acquire, finance, and build companies where our operational expertise and capital can unlock outsized value. Our team combines institutional investment discipline with crypto-native insight to identify and execute on complex opportunities across the industry's most dynamic segments.The RoleThe Senior Software Engineer is a seasoned professional with at least 6 years of experience in software development. Specialized in finance or crypto within the technology industry, this individual excels in leading problem-solving, driving coding excellence, ensuring comprehensive testing, and adopting scalable and secure software implementations for solutions in areas like trading, swapping, regulatory compliance, fraud detection, automation, and more.What You'll DoAs a Senior Full Stack Engineer on our core engineering team, you will:Take end-to-end ownership of features (backend, API, frontend integration, deployment)Design and build new modules (exchange connectors, order routing, wallet / transaction modules, alerts engine)Improve, maintain, and scale existing servicesImplement, enforce, and monitor APIs to external crypto exchanges (REST, WebSocket, FIX where applicable)Work on state synchronization, caching, rate limits, backpressure, and resilient connectivityEnsure system security and correctness (authentication, authorization, encryption, safe handling of keys / wallets)Participate in architectural decisions and roadmap planningOccasionally interface with DevOps / infrastructure to deploy, monitor, and maintain production servicesWhat We're Looking ForA comprehensive grasp of Crypto and Crypto TradingExcellent analytical, critical thinking, and problem-solving skills in financial technology contextsOutstanding testing practices, TDD, unit, integration, e2e testing, (JUnit or similar frameworks)Ability to manage, coordinate, and prioritize work with multiple team members for delivering software with quality in timeStrong communication skills and an ability to collaborate cross-functionally with product, engineering, and other departmentsAble to explain technical concepts to both technical and non-technical stakeholdersMust be located in the Americas or Europe (between time zones UTC-5 and UTC+3)Solid track record of over 10 years demonstrating mastery of Java, Kotlin, Swift, mainly in production applicationsSolid experience in administration, modeling, optimization techniques in SQL and NoSQL databasesKnowledge of software for interface prototyping and wireframing like FigmaUnderstanding of Git and branching models for coordination with team membersPreferred / Bonus:Past experience in crypto / fintech / trading systemsExperience interacting with blockchain / smart contracts / wallets / DeFi systemsExperience with FIX, exchange protocols, order routing logicExperience with containerization / orchestration (Docker, Kubernetes)Experience with CI/CD pipelines, DevOps knowledgeExperience in microservices / domain-driven design, event-driven architecturesExperience with high throughput & low latency systemsHands-on experience working with release management and architecting within cloud platforms like AWSFamiliarity with network security, traffic encryption, and authentication protocolsExpertise in utilizing in-memory databases like Redis and Memcached, and processing queues such as Apache Kafka, or RabbitMQ, or standards like AMQPEnhanced skills in other programming languages like Golang and Java are highly valued