Backend Developer (Senior Java Developer

Job Title: Senior Backend Developer (Java & Spring Boot)

Role Overview
We are seeking a seasoned, hands-on Senior Backend Developer with deep expertise in Java, Spring Boot, and database technologies to join our growing engineering team. In this role, you will play a pivotal architectural and development part in designing, building, and maintaining scalable, high-performance backend applications. You will champion clean code standards, optimize database performance, and mentor junior and mid-level engineers to foster technical growth across the team.

This is a critical, on-site engineering leadership position for a professional who thrives in a collaborative, fast-paced product environment. You will architect robust microservices-based solutions, contribute to technical roadmaps, and collaborate closely with product managers, QA, DevOps, and frontend teams. If you possess a strong foundation in enterprise Java engineering and a passion for scalable system design, we want to hear from you.

Key Responsibilities
Architecture & Engineering
Application Design: Design, develop, and maintain robust, scalable, and high-performance backend applications utilizing Java and Spring Boot.
Microservices Architecture: Architect and implement microservices-based solutions; actively contribute to system design discussions and architectural roadmaps.
Code Quality: Write clean, efficient, testable, and well-documented code adhering strictly to design patterns, SOLID principles, and clean code practices.
Database Optimization: Design, architect, and optimize relational database schemas, complex queries, stored procedures, and indexing strategies for high throughput and scalability.

Collaboration & Leadership
Mentorship: Mentor junior and mid-level developers, providing constructive code reviews and fostering a culture of technical excellence and continuous learning.
Cross-Functional Delivery: Collaborate seamlessly with product management, QA, DevOps, and frontend engineering teams in an Agile/Scrum environment.
Troubleshooting: Diagnose, debug, and resolve complex production incidents to ensure high availability and reliability standards are met.
DevOps & CI/CD: Contribute to CI/CD pipeline enhancements, containerization (Docker/Kubernetes), and automated testing practices (JUnit/Mockito, TDD).

Qualifications & Requirements
Minimum Qualifications
Education: Bachelor's or Master's degree in Computer Science, Engineering, or a related field (or equivalent practical experience).
Experience Baseline: Minimum of 10+ years of professional software development experience, with deep specialization in Java engineering.
Technical Mastery:
oStrong, hands-on expertise with Spring Boot and the broader Spring Framework (Spring MVC, Spring Data, Spring Security).
oProven experience architecting and building production-grade microservices architectures.
oDeep expertise in relational databases (e.g., MySQL, PostgreSQL, Oracle) with strong command over schema design and query optimization.
oSolid understanding of RESTful API design principles and ORM frameworks (Hibernate/JPA).
oProficiency with build tools (Maven/Gradle), version control (Git), and automated testing frameworks (JUnit, Mockito).
oFamiliarity with containerization/orchestration tools (Docker, Kubernetes) and message queuing systems (Kafka, RabbitMQ).
oGeneral knowledge of cloud platforms (AWS, Azure, Google Cloud Platform) and enterprise CI/CD workflows.
Core Competencies: Exceptional analytical and problem-solving skills; excellent verbal and written communication abilities; proven capacity to work independently and drive technical initiatives.

Preferred Attributes
Prior experience within fast-paced consumer, retail, or eCommerce product environments.
Hands-on experience with event-driven architectures and NoSQL databases (MongoDB, Redis).
Familiarity with application monitoring and performance tuning tools (e.g., New Relic, Datadog, Splunk).
Prior background in a technical leadership, tech lead, or formal mentorship role.

Equal Opportunity Employer / Disabled / Protected Veterans

The Know Your Rights poster is available here:
_EEOC_KnowYourRights6.12.pdf

The pay transparency policy is available here:
_%20English_formattedESQA508c.pdf

For temporary assignments lasting 13 weeks or longer, AllSTEM Connections is pleased to offer major medical, dental, vision, 401k and any statutory sick pay where required.

We are committed to working with and providing reasonable accommodations to individuals with disabilities. If you need a reasonable accommodation for any part of the employment process, please contact your staffing representative who will reach out to our HR team.

AllSTEM Connections participates in the E-Verify program in certain locations as required by law. Learn more about the E-Verify program.
_Participation_Poster_ES.pdf

We also consider for employment qualified applicants regardless of criminal histories, consistent with legal requirements, including, if applicable, the City of Los Angeles' Fair Chance Initiative for Hiring Ordinance. Pursuant to applicable state and municipal Fair Chance Laws and Ordinances, we will consider for employment-qualified applicants with arrest and conviction records, including, if applicable, the San Francisco Fair Chance Ordinance. For Los Angeles, CA applicants: Qualified applications with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act.
Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

Additional Skills

(none specified)

AllSTEM Representative Contact Info

Account Executive:

Nichols

Branch Phone:



Location:

Ontario, CA