Senior Java Engineer: Scalable B2 APIs & Observability

Backblaze; United States; Remote; USD 140,000 - 230,000; Full time

Job summary

Backblaze is seeking an experienced backend engineer to design and implement B2 and S3-compatible APIs, focusing on correctness, performance, and backward compatibility. You will help lead design discussions and contribute to reliability through on-call rotations, with a strong emphasis on scalable, observable systems.

The role requires deep Java expertise, a track record with large-scale distributed architectures, and familiarity with AI-assisted development tools to accelerate delivery.

Qualifications

• 7+ years of server-side Java with strong CS fundamentals.
• Experience with large-scale distributed systems.
• Experience with AI-assisted development tools (e.g., Gemini, Cursor, Claude Code).

Responsibilities

• Design, implement, and maintain B2 and S3-compatible APIs for correctness, performance, and backward compatibility.
• Lead technical design discussions and produce clear design docs.
• Participate in on-call rotation to determine root causes and drive reliability improvements.

Skills

Java

Algorithms

Distributed systems

Remote communication

AI-assisted tooling

Tools

S3-compatible APIs

Job description

Backblaze is seeking an experienced backend engineer to design and implement B2 and S3-compatible APIs, focusing on correctness, performance, and backward compatibility. You will help lead design discussions and contribute to reliability through on-call rotations, with a strong emphasis on scalable, observable systems.

The role requires deep Java expertise, a track record with large-scale distributed architectures, and familiarity with AI-assisted development tools to accelerate delivery.