Senior Software Engineer III, Backend

Connexity; Los Angeles (CA); Hybrid; USD 175,000 - 200,000; Full time

Benefits offered by this job

Health insurance

Retirement Plan (401k)

Life Insurance (Basic, Voluntary & AD)

Paid Leave Benefits (Maternity, Parity

Free Food & Snacks

Wellness Resources

Equity

Job summary

Connexity, a Taboola company, is seeking a Senior Backend Engineer to design and build scalable API-driven backend systems for an advertiser management platform. You will contribute to architecture, data modeling, and cross-functional collaboration to deliver high-performance services.

The role requires 10+ years in backend development, strong Java, Spring Boot, and REST/API expertise, plus experience with relational databases and distributed systems.

Qualifications

• 10+ years of professional backend experience with high-performance systems.
• Proficiency in Java; Python/Node.js/Go also required.
• Must have Spring Boot experience.
• RESTful API design and implementation expertise.
• Strong relational DB skills (MySQL, PostgreSQL); NoSQL/BigQuery exposure helpful.
• Experience with distributed systems and microservices.
• Experience with AI coding tools and evaluating AI-generated code.
• Awareness of Agile development practices.
• Eligible to work in the United States.
• Degree in CS/Engineering or related field preferred.

Responsibilities

• Backend development of scalable systems and APIs.
• Contribute to architecture, data model, and design decisions.
• Model relational schemas and optimize queries.
• Collaborate with product, design, and engineering teams.
• Troubleshoot complex issues and optimize performance.
• Maintain code quality with testing and reviews.
• Evaluate and adopt new tools and AI-assisted development.

Skills

Java

Spring Boot

RESTful APIs

Distributed systems

Microservices

Relational databases

MySQL

PostgreSQL

NoSQL databases

BigQuery

AI-assisted development

Agile methodologies

LLM API integration

System design

Education

Bachelor's or higher in Computer Science/Engineering or related field

Tools

Claude Code

GitHub Copilot

Cursor

Job description

Connexity, a Taboola company, is a data-driven retail performance marketing and commerce platform that helps online retailers acquire new customers and drive incremental sales at a cost that meets their ROI objectives. As the leading independent source of new customers and sales for retailers, we manage the complexities of new customer acquisition on behalf of thousands of retailers. Connexity technology connects merchants like Walmart, Wayfair and Macy's with high-intent shoppers across a vast and complex network of publishers, creators, search and marketplace channels. We joined forces with Taboola in 2021, own ShopYourLikes and Skimlinks, making us the largest, open-web performance platform in the Retail & eCommerce space, generating $5B of GMV/retail sales per year.

About the Role:

We are seeking a skilled and motivated Senior Software Engineer III, Backend 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.

Responsibilities:

• 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.

Requirements

• Experience: 10+ years of professional experience in backend development, with a track record of designing and delivering high-performance systems.
• Programming Languages: Proficiency in Java is a must. Experience with Python, Node.js, or Go is also required.
• Backend Frameworks: Hands-on experience with Spring Boot is a must.
• API Development: Solid knowledge of RESTful API design, best practices, and implementation.
• 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 also required.
• System Design: Strong understanding of software architecture, design patterns, and system design principles. Experience building and maintaining distributed systems and microservices.
• 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.
• Methodologies: Experience working in Agile development environments.
• Work Authorization: Eligible to work in the United States.
• Education: A degree in Computer Science, Engineering, or a related field is preferred but not required.

Voted “Best Places to Work,” our culture is driven by self-starters, team players, and visionaries. Headquartered in Santa Monica, the company operates sites and business services in the US, EMEA, and APAC. We offer top benefits including flexible time off, paid holidays, competitive comp, team events and more!

• Health Care Plans (Medical, Dental & Vision)
• Retirement Plan (401k Matching)
• Life Insurance (Basic, Voluntary & AD&D), LTD & STD
• Paid Leave Benefits (Maternity, Paternity & Medical)
• Free Food & Snacks
• Wellness Resources
• Equity

We are committed to providing a culture at Connexity that supports the diversity, equity and inclusion of our most valuable asset, our people. We encourage individuality and are driven to represent a workplace that celebrates our differences, and provides opportunities equally across gender, race, religion, sexual orientation, and all other demographics. Our actions across Education, Recruitment, Retention, and Volunteering reflect our core company values and remind us that we’re all in this together to drive positive change in our industry.

The pay for this position is $175,000-$200,000 USD annually and depends on several factors such as location, job-related knowledge, skills, and experience. We offer many perks as part of the compensation package that include equity, Flexible Time Off (FTO), medical/dental/vision insurance, a competitive 401(k) match, paid parental leave, and more.

This position is hybrid preferred, with two days per week in our Santa Monica office. Fully remote available depending on location and in the following states: CA, TX, NV, CO, WA