Senior Backend Developer

About the Role

We are hiring Staff / Principal Engineers to take full, hands-on ownership of Blitzy's most critical production-grade systems and to deliver high-leverage features that materially improve customer outcomes and engineering velocity. This is the most senior individual contributor role at the company today.

This is not a Senior-plus role, an architecture-only role, or a promotion-track role. We are looking for someone who has already operated at Principal / Staff+ scope in a highly technical environment and expects to spend their time writing, reviewing, and shipping production code.

This role is 100% hands-on. Leverage comes from system ownership, execution quality, and durable technical decisions — not people management or process.

Responsibilities

• Own mission-critical production systems end-to-end, ensuring correctness, scalability, performance, reliability, and operational excellence.
• Design, build, and ship high-impact backend systems and features that improve product reliability, performance, and customer value.
• Architect scalable services and cloud infrastructure using technologies such as Python, REST, gRPC, Kubernetes, and Terraform.
• Identify and resolve complex technical bottlenecks that limit engineering quality, system performance, or organizational velocity.
• Build and operate LLM-powered systems and validation loops that evaluate correctness, consistency, durability, and production performance.
• Design and evolve data architectures incorporating relational, NoSQL, graph, and vector databases to support complex enterprise applications and semantic retrieval.
• Modernize and improve complex enterprise systems while balancing reliability, maintainability, scalability, and delivery speed.
• Set and uphold engineering quality standards through hands-on technical leadership, sound technical judgment, and ownership of long-term technical decisions.

Qualifications

• Direct experience with Python as a primary programming language, backend frameworks, and microservices architectures.
• Expertise in REST and gRPC, with proficiency in Node.js and JavaScript.
• Proficiency in GCP, along with experience using at least one additional cloud platform such as AWS or Azure.
• Advanced knowledge of Kubernetes and Terraform in production environments.
• Experience operating highly available production systems, including monitoring, scalability, reliability, performance optimization, and operational tooling.
• Strong knowledge of SQL and NoSQL databases, including PostgreSQL, MySQL, MongoDB, Cassandra, or DynamoDB.
• Familiarity with graph databases such as Neo4j and vector databases or embedding infrastructure for semantic search and retrieval.
• Hands-on experience building and operating LLM-powered systems in production, including evaluation, validation, regression testing, tracing, and failure analysis.
• Working knowledge of LangSmith or comparable LLM observability and evaluation tools; familiarity with OpenAI, Anthropic, or similar model providers is a plus.
• Ability to contribute across the full stack, with a strong understanding of frontend architecture and the ability to debug, design, and ship across frontend, backend, infrastructure, and AI systems.
• Understanding of large-scale enterprise software systems, including architecture, integration, deployment, modernization, and long-term maintainability.
• Proven track record of operating at Staff+, Principal Engineer, or equivalent level, independently driving complex technical initiatives and delivering high-impact outcomes with minimal supervision.

Blitzy is a Cambridge, MA based AI software development platform on a mission to revolutionize the software development life cycle by autonomously building custom software to unlock the next industrial revolution. We're transforming how enterprises build software, turning enterprise requirements into enterprise grade code with an agentic software development platform that can autonomously execute 80% of the quantum of software development work. We're backed by multiple tier 1 investors, and have proven success as founders of previous start-ups.

Our Culture

Who we are:

Led by two pioneering co-founders we are one of the fastest growing companies in the U.S., creating our own category of enterprise autonomous software development. We automate thousands of hours of software development for our customers, which includes strong representation within the Fortune 500.

How we work:

• We move Blitzy Fast: Time is both our company’s and our clients’ most precious asset. We move quickly and decisively to innovate internally and deliver exceptional software externally.
• Championship Mindset: We operate like a professional sports team. We win as a team by holding ourselves and each other to high standards, collaborating in-person, and remaining focused on the mission.
• Passion for Invention: We’re pushing the frontier of what’s possible, requiring constant innovation and iteration.
• We Work for the Customer: We focus on delivering outsized value to the customers we work with and expanding those relationships into deep, meaningful partnerships.
• We believe in being ‘everyday athletes’: taking care of ourselves so we can bring our best minds to work. We promote great sleep, movement, and restorative activities for 

Blitzy is an equal opportunity employer committed to building a diverse and inclusive team. We believe different perspectives make us stronger.

Key Responsibilities:

• Involve in the Design And Development Of Scalable Backend Applications Using Java (Spring Boot).
• Mentor And Guide A Team Of Developers To Ensure High-Quality Deliverables.
• Take Ownership Of Solution Architecture, Coding Standards, And Design Patterns.
• Develop And Manage Restful Apis And Integrate Third-Party Services.
• Collaborate With Front-End Teams, Qa, And Stakeholders To Align Technical Implementation With Business Goals.
• Oversee Deployments In Hybrid Cloud Environments In Coordination With Devops Teams.
• Conduct Code Reviews, Lead Design Discussions, And Manage Agile Development Processes (Scrum/Kanban).
• Monitor Application Performance And Drive Improvements Proactively.
• Troubleshoot And Resolve Complex Software Issues Across Systems And Services.

Required Skills:

• 6+ Years Of Professional Experience In Java Development.
• Strong Hands-On Expertise In Spring Boot And Microservices Architecture.
• Working Knowledge Of Node.Js And Javascript/Typescript.
• Experience With Rest Apis, Sql/Nosql Databases (Mysql, Postgresql, Mongodb).
• Familiar With Ci/Cd Pipelines, Git, And Modern Devops Practices.
• Proven Ability To Lead Distributed Teams And Manage Deliverables In A Remote/Hybrid Work Setup.
• Strong Communication, Leadership, And Problem-Solving Skills.

Qualifications:

• A Bachelor’s degree in Computer Science (or equivalent experience)
• M-Tech or advanced degree a plus
• Hackathon participation and accolades are a plus

Job Role:

• 4+ years of object-oriented Java / J2EE development
•  Full SDLC experience (requirements gathering, architecture, development, QA, etc)…
•  Experience with Spring (MVC, IOP/DI, REST, Security) & Hibernate/Spring
•  Experience with SOAP / REST web services
•  Knowledge of SQL
•  Knowledge of No SQL concepts, understanding of Solr, Redis and Mongo DB is desirable
•  Must have worked on any one messaging solutions
•  Bonus Points for micro service design and development experience
•  Bonus points for any mobile development experience
•  Used Agile methodology
•  Bonus Points for experience working on Unix, shell scripting & Build Systems
•  Experience in performance optimization is an added advantage

Desired Candidate Profile

• 5to 7 years plus experience having implemented Adobe Experience Manager based Solution in a large scale environment
• Deep understanding of Adobe AEM, Apache Sling, Servlets
• Experience developing applications, templates, and components for the Adobe AEM product (WCM, DAM, CRX)
• Experience customizing workflows and integration with other enterprise systems
• Demonstrated experience with Java, JavaScript, HTML5, CSS3, and related technologies
• Expertise in Java, web development experience, and other Content management system experience.
• Great understanding of Web technologies like XML, HTML, Client Server-side scripting languages such as JavaScript, JSP, and web services development using RESTful implementations.
• Should have exposure on the continuous integration build tools and code quality tools

Responsibilities

• Develop digital consumer experiences based on a foundation of the Adobe AEM product suite, including AEM, CRX, Target, and DAM
• Translate marketing and website needs into AEM specific recommendations and solutions
• Leverage AEM, other state-of-the-art technologies, and integration patterns to solve cross-departmental challenges
• Design and improve internal development methodologies around Adobe AEM solution
• Develop front end and back end components using AEM