Full Stack Developer

Epsilon; Chicago (IL); On-site; USD 74,000 - 137,000; Full time

Benefits offered by this job

Flexible time off

Parental leave

Tuition assistance

401(k)

Job summary

Epsilon, a global data and identity leader, seeks a mid-level Full Stack Developer on the Automation & Infrastructure team to own features end-to-end. You will build web apps in TypeScript, create secure APIs with Node.js, and help automate workflows for internal teams while collaborating with senior engineers on architecture decisions.

You’ll work with internal users to clarify requirements, implement robust testing, and contribute to AI-enabled features and integrations that improve operations.

Qualifications

• Bachelor’s degree in Computer Science or a related field, or equivalent practical experience.
• 2+ years of professional software development experience, including experience delivering and supporting production applications.
• Strong proficiency in TypeScript and experience with Angular or another modern frontend framework.
• Experience building backend applications and APIs with Node.js and frameworks such as NestJS or Express.
• Experience building data-driven web applications and integrating with internal or external APIs.
• Working knowledge of relational databases and SQL, such as PostgreSQL or MySQL.
• Experience writing automated tests and troubleshooting application issues.
• Proficiency with Git and collaborative development workflows.
• Experience developing or supporting applications in Linux-based environments.
• Ability to break work into manageable increments, communicate progress and dependencies, and raise blockers or priority conflicts early.
• Ability to clarify requirements with technical and non-technical partners and explain technical decisions clearly.

Responsibilities

• Build and maintain usable, accessible web applications using TypeScript and modern frontend frameworks.
• Develop secure, well-structured APIs and backend services using Node.js and frameworks such as NestJS or Express.
• Write clean, maintainable code and automated tests appropriate to the change.
• Participate in code reviews and contribute to shared development practices.
• Troubleshoot application and integration issues using logs, monitoring, and other diagnostic tools.
• Work with internal users to clarify requirements, validate workflows, and improve existing applications.
• Contribute to AI-enabled application features and workflow automation where appropriate.

Skills

TypeScript

Angular

API development

Automated tests

Git workflows

Linux environments

Requirements clarification

Testing

Education

Bachelor’s degree in Computer Science or related field

Tools

Node.js

NestJS

Express

PostgreSQL

MySQL

Git

Linux

Job description

Company Description

See how Epsilon powers connected marketing by unlocking the full potential of data and identity.

Company Description

See how Epsilon powers connected marketing by unlocking the full potential of data and identity.

Overview

As a Full Stack Developer on the Automation & Infrastructure team, you’ll build and support internalapplications and integrations that automate workflows and help operational teams work more efficiently. You’ll work directly with internal users and project teams to understand their workflows and turn requirements into practical software solutions.

In this mid-level role, you’ll independently own clearly scoped features and improvements through development, testing, deployment, and ongoing support, collaborating with senior engineers on broader architecture decisions.

Responsibilities

What You’ll Achieve

• Build and maintain usable, accessible web applications using TypeScript and modern frontend frameworks.
• Develop secure, well-structured APIs and backend services using Node.js and frameworks such as NestJS or Express.
• Write clean, maintainable code and automated tests appropriate to the change.
• Participate in code reviews and contribute to shared development practices.
• Troubleshoot application and integration issues using logs, monitoring, and other diagnostic tools.
• Work with internal users to clarify requirements, validate workflows, and improve existing applications.
• Contribute to AI-enabled application features and workflow automation where appropriate.

Qualifications

Who You Are

• Bachelor’s degree in Computer Science or a related field, or equivalent practical experience.
• 2+ years of professional software development experience, including experience delivering and supporting production applications.
• Strong proficiency in TypeScript and experience with Angular or another modern frontend framework.
• Experience building backend applications and APIs with Node.js and frameworks such as NestJS or Express.
• Experience building data-driven web applications and integrating with internal or external APIs.
• Working knowledge of relational databases and SQL, such as PostgreSQL or MySQL.
• Experience writing automated tests and troubleshooting application issues.
• Proficiency with Git and collaborative development workflows.
• Experience developing or supporting applications in Linux-based environments.
• Ability to break work into manageable increments, communicate progress and dependencies, and raise blockers or priority conflicts early.
• Ability to clarify requirements with technical and non-technical partners and explain technical decisions clearly.

Why You Might Stand Out From Other Talent

• Experience with Docker and containerized application deployments.
• Experience with CI/CD pipelines and modern DevOps practices.
• Experience with scripting languages such as Python or Bash.
• Experience integrating AI services or APIs into applications, including handling structured outputs, validation, and failure cases.
• Experience building internal applications, workflow automation, or integrations that replace manual operational processes.

Additional Information

When you join Epsilon, we’ll create something EPIC together. We’re a global leader in data and identity, with deep expertise in digital media, clean rooms, customer data platforms, loyalty and marketing services. Positioned at the center of Publicis Groupe, Epsilon helps brands deliver personalized experiences at scale and build lasting customer relationships by unlocking the full potential of data and identity. Epsilon operates in 30+ countries across EMEA, the Americas and APAC, with more than 8,000 employees.

Check out a few of these resources to learn more about what makes Epsilon so EPIC:

Our Culture: https://www.epsilon.com/us/about-us/our-culture-epsilon

Life at Epsilon: https://www.epsilon.com/us/about-us/epic-blog

Epsilon Has Five Values That Define Our Culture And Guide Us As We Create Value For Our Clients, Our People And Consumers. We Seek Candidates Who Align With Our Company Values, Demonstrate Them And Make Them Meaningful In Their Day-to-day Work

• Act with integrity. We are transparent and have the courage to do the right thing.
• Work together to win together. We believe collaboration is the catalyst that unlocks our full potential.
• Innovate with purpose. We shape the market with big ideas that drive big outcomes.
• Respect all voices. We embrace differences and foster a culture of connection and belonging.
• Empower with accountability. We trust each other to own and deliver on common goals.

Because You Matter

Benefits

• Time to recharge: Flexible time off (FTO), 14 paid holidays, paid sick time
• Family well-being: Parental/new child leave, childcare & elder care assistance, adoption assistance
• Extra perks: Comprehensive health coverage, 401(k), tuition assistance, commuter benefits, professional development, employee recognition, charitable donation matching, health coaching and counseling

Epsilon benefits are subject to eligibility requirements and other terms.

Epsilon is an Equal Opportunity Employer. Epsilon’s policy is not to discriminate against any applicant or employee based on actual or perceived race, age, sex or gender (including pregnancy), marital status, national origin, ancestry, citizenship status, mental or physical disability, religion, creed, color, sexual orientation, gender identity or expression (including transgender status), veteran status, genetic information or any other characteristic protected by applicable federal, state or local law. Epsilon also prohibits harassment of applicants and employees based on any of these protected categories. Epsilon will provide accommodations to applicants who need accommodations to complete the application process. Please reach out to [e-mail] to request an accommodation.

For San Francisco Bay and Los Angeles Areas: Epsilon will consider qualified applicants with criminal histories for employment in a manner consistent with the City of Los Angeles’ Fair Chance Initiative for Hiring Ordinance and San Francisco Police Code Sections 4901-4919, commonly referred to as the San Francisco Fair Chance Ordinance. Applicants with criminal histories are welcome to apply.

Compensation Range: USD $73,500.00 - USD $136,500.00/Annually. This is the pay range the Company believes it will pay for this position at the time of this posting. Consistent with applicable law, compensation will be determined based on the skills, qualifications, and experience of the applicant along with the requirements of the position, and the Company reserves the right to modify this pay range at any time. Temporary roles may be eligible to participate in our freelancer/temporary employee medical plan through a third-party benefits administration system once certain criteria have been met. For regular roles, the Company will offer medical coverage, dental, vision, disability, 401k, and paid time off. The Company anticipates the application deadline for this job posting will be 11/16/2026.