Senior Software Engineer (Backend)

Connexity; Santa Monica (CA); On-site; USD 140,000 - 200,000; Full time

Benefits offered by this job

Flexible Time Off

10 paid holidays

Life Insurance

Disability Leaves

Medical, Dental, Vision

AD&D

Wellness program

DEI Council

Team events

Job summary

Connexity is seeking a skilled backend engineer for its Internal Tools team in Santa Monica. You will design APIs, services, and data models to build a high-performance advertiser management platform unifying legacy systems.

Expect to own backend development, architecture decisions, and collaboration with cross-functional teams. You will work on scalable server-side components, microservices, and data modeling, while maintaining code quality, testing, and thorough documentation.

Qualifications

• 6+ years of professional backend development experience.
• Proficient in Java; knowledge of Python, Node.js or Go is a plus.
• Strong API design and RESTful development experience.
• Experience designing scalable, high-performance distributed systems.
• Experience with AI-assisted coding tools and evaluating AI-generated code.
• Hands-on with Spring Boot and relational databases (MySQL, PostgreSQL).
• Experience with NoSQL or analytical warehouses (BigQuery) is a plus.
• Bachelor's degree in CS/Engineering preferred but not required.

Responsibilities

• Design APIs and services for the advertiser management platform.
• Develop and maintain scalable backend systems and microservices.
• Model data and optimize relational schemas.
• Collaborate with product, design and engineering teams.
• Ensure code quality through testing, reviews and documentation.
• Drive performance improvements and refactor the codebase.

Skills

Problem-Solving

Backend development

System design

Java

AI-assisted development

REST API design

Agile methodologies

Education

Bachelor's degree in CS/Engineering or equivalent

Tools

Spring Boot

MySQL

PostgreSQL

BigQuery

Job description

• We are seeking a skilled and motivated backend engineer to join our Internal Tools team. Our team owns the design and implementation of our next-generation internal tools platform — a new advertiser management platform that unifies several legacy systems under a single, modern foundation, with a focus on high-performance middleware and backend services
• You will play a central role in building this platform from the ground up: designing APIs and services, shaping the data model, and collaborating with cross-functional teams to deliver scalable, high-performance solutions
• Backend Development: Design, implement, and maintain scalable backend systems. Develop APIs, microservices, and other server-side components that power platform features and functionality
• Architecture and Design: Contribute to the architecture and design of backend systems. Ensure solutions are reliable, scalable, and performant, and make informed decisions on technology choices and system design
• Data Modeling: Design and optimize relational database schemas and queries that serve as the system of record for the platform
• Collaboration: Work closely with product managers, designers, and engineers to define and implement new features and improvements
• Problem-Solving: Identify and troubleshoot complex technical issues, provide effective solutions, and optimize system performance. Continuously improve and refactor the codebase to enhance scalability and maintainability
• Code Quality: Maintain high standards for code quality, including thorough testing, code reviews, and documentation
• Innovation: Stay current with industry trends and emerging technologies. Evaluate and recommend new tools, frameworks, and libraries — including AI-assisted development tooling — to strengthen our stack and our team’s velocity

Benefits

• Preparing for the Future > A company match to enhance your savings for those golden years.
• Work/Life Time > Flexible Time Off and 10 paid holidays per year – Ask about Summer Fridays!
• Protect Your Family > Company paid Life Insurance, AD&D, and paid Disability Leaves.
• Health > Medical, Dental, Vision, Telehealth, Spending Accounts, Flu Shots, and more! (Transparency in Coverage)
• Employee Recognition Program > We recognize performance, innovation, and being a good “Xer”.
• DEI Council > Transforming our workplace into an inclusive environment.
• Learning & Development > If you like learning, we like training.
• Events > We celebrate…everything! Team building, parties, and charity events.
• Wellness > Join our team of Wellness Warriors!

Qualifications

• Problem-Solving: Strong analytical and problem-solving skills with the ability to tackle complex technical challenges
• Experience: 6+ years of professional experience in backend development, with a track record of designing and delivering high-performance systems
• System Design: Strong understanding of software architecture, design patterns, and system design principles. Experience building and maintaining distributed systems and microservices
• Programming Languages: Proficiency in Java is a must. Experience with additional languages (e.g., Python, Node.js, Go) is a plus
• API Development: Solid knowledge of RESTful API design, best practices, and implementation
• AI-Assisted Development: Practical, hands-on experience using AI coding tools (e.g., Claude Code, GitHub Copilot, Cursor) as part of your daily development workflow — for code generation, refactoring, test writing, and debugging. You should be able to critically evaluate AI-generated code, recognize when it is wrong or subtly unsafe, and take full ownership of everything you ship. Experience integrating LLM APIs into applications or building internal AI-powered tooling is a plus
• Backend Frameworks: Hands-on experience with Spring Boot is a must
• Database Skills: Strong expertise in relational databases (e.g., MySQL, PostgreSQL), including schema design, query optimization, and reasoning about data integrity and consistency. Experience with NoSQL databases or analytical warehouses (e.g., BigQuery) is a plus
• Education: A degree in Computer Science, Engineering, or a related field is preferred but not required
• Collaboration: Excellent communication and interpersonal skills with a proven ability to work effectively in a team environment. Experience working in Agile methodologies