Senior Java Engineer

Job Summary

5-10+ years of hardcore backend engineering experience. This is not a typical Java role. If your experience is mostly CRUD APIs, controller wiring, or shallow service layers - this role is not for you. We are looking for a top-tier backend engineer who thrives on: Designing complex algorithms Building high-performance, memory-efficient systems Owning deep backend logic that actually moves the needle. You will work close to the core engine of the product, not the edges. What You'll Be Trusted With: Architect and build backend systems that must perform under load Design and implement custom algorithms for real-world, non-trivial problems Solve performance bottlenecks involving CPU, memory, I/O, and concurrency Build backend services where latency, throughput, and correctness matter Own document PDF processing pipelines end-to-end: Composition Rendering Optimization High-volume generation Make hard technical decisions and stand by them Mentor engineers by setting the bar, not micromanaging.

Responsibilities

• Architect and build backend systems that must perform under load
• Design and implement custom algorithms for real-world, non-trivial problems
• Solve performance bottlenecks involving CPU, memory, I/O, and concurrency
• Build backend services where latency, throughput, and correctness matter
• Own document PDF processing pipelines end-to-end: Composition Rendering Optimization High-volume generation
• Make hard technical decisions and stand by them
• Mentor engineers by setting the bar, not micromanaging

Requirements

• Exceptional Java expertise (Core Java, Spring Boot, Java 8+)
• Strong command over: Data structures algorithms
• Multithreading concurrency models
• JVM internals memory management
• Proven experience building custom algorithms (this will be evaluated)
• Deep backend engineering experience with Spring / Spring Boot
• Strong understanding of: API design principles
• Fault tolerance resilience
• Performance tuning profiling
• Ability to reason about time complexity, space complexity, and trade-offs
• Strong database fundamentals (query optimization, indexing, transactions)

Qualifications

• Built or worked on PDF / document processing systems
• Experience with opensource or licensed PDF engines
• CCM platforms or document automation products
• Designed systems handling millions of documents or transactions
• Worked on event-driven or async architectures
• Experience with message brokers (ActiveMQ, Kafka, RabbitMQ)
• Exposure to Kubernetes-based deployments or large-scale microservices

What Sets You Apart

• You enjoy hard problems more than frameworks
• You think in algorithms, trade-offs, and failure modes
• You care about code quality, performance, and long-term maintainability
• You can look at a slow system and methodically make it fast
• You take ownership like a product engineer, not just a task executor

Interview Focus

• Algorithm design problem solving
• Deep Java fundamentals
• System design discussions (backend-heavy)
• Performance tuning scenarios
• Real-world debugging and optimization challenges

Why This Role Is Worth Your Time

• You'll work on core backend systems, not glue code
• You'll solve problems most teams avoid
• You'll have real ownership and technical influence
• You'll work on document and PDF systems at scale
• You'll be surrounded by engineers who respect depth over buzzwords

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