Headline

Senior Backend Engineer | Java/Spring Boot/Kafka/AWS | AI-Accelerated Microservices | Remote EU Open

About

Senior Backend Engineer with 6+ years of experience building distributed, event-driven systems in fintech and crypto domains. Designed and built a custom annotation-based JWT authentication framework (with passkey support) used across a 17-service architecture — a single annotation handles service-to-service and user auth end-to-end. Core stack: Java 21, Spring Boot, Apache Kafka, AWS, PostgreSQL, Redis, Docker, Microservices. At RockWallet I work on a regulated crypto wallet platform — designing payment flows, KYC integrations, blockchain transaction tracking, and high-availability backend services across a 17-service microservices architecture. Previously at EPAM and Lenskart, building scalable backend APIs for enterprise and e-commerce clients. Currently open to Senior Backend Engineer roles in Germany, Netherlands, Ireland, or Portugal. Relocation-supported positions preferred. Available for remote interviews immediately. Languages: English (B2), German (learning actively, A2).

Location

India

AI stack

claude code

codex

cursor

gemini

ollama

opencode

Work experience

Senior Java Developer at RockWallet, Jan 2025 - Present · 1 yr 8 mos, Remote, > Designed and implemented a custom annotation-based JWT authentication framework enabling service-to-service and user authentication across 17 microservices with a single annotation, including passkey support and full TLS/SSL configuration on AWS MSK. > Architected and maintained a monorepo structure housing 17 microservices and 10 shared reusable libraries, using TOML-based dependency management for consistent builds across teams. > Built a centralized configuration server enabling zero-downtime configuration updates across all services in production. > Designed and implemented Kafka-based event-driven architecture (AWS MSK) to decouple core business flows, contributing to API response times of 200–400ms. > Developed 8+ microservices covering user authentication, onboarding, KYC verification, crypto transaction status syncing, and business rule engines. > Built and maintained CI/CD pipelines using GitHub Actions and Jenkins for automated build, test, and deployment workflows. > Worked directly on KYC verification flows, crypto transaction syncing, and internal admin/ops tooling for a regulated crypto wallet platform.

Student Mentor at Udacity, Dec 2024 - Present · 1 yr 9 mos, Remote

Senior Software Engineer at EPAM Anywhere, Feb 2024 - Jan 2025 · 1 yr, Gurugram, Haryana, India

Senior backend engineer at SCALONG an iBoss Tech brand, Jul 2022 - Jan 2024 · 1 yr 7 mos, Noida, Uttar Pradesh, India

SDE1 at Lenskart.com, Oct 2019 - Jul 2022 · 2 yrs 10 mos, Faridabad, Haryana, India

Education

Bachelor of Technology (B.Tech.), Computer Science, Swami Rama Himalayan University

Public links

github: https://github.com/kaushal-bhatt