Lead Software Engineer
Epsilon
About Business Unit:
The Product team forms the crux of our powerful platforms and helps connect millions of customers worldwide with the brands that matter most to them. This team of innovative problem solvers develops and builds products that position Epsilon as a differentiator, encouraging an open and balanced marketplace built on respect for individuals, where every brand interaction holds value. Our full-cycle product engineering and data teams chart the future and set new benchmarks for our products, by using industry standard methodologies and sophisticated capabilities in data, machine learning, and artificial intelligence. Driven by a passion for delivering smart end-to-end solutions, this team plays a key role in Epsilon's success story.
Why are we looking for you?
At Epsilon, we run on our people's ideas. It's how we solve problems and exceed expectations. Our team is now growing, and we are on the lookout for dedicated individuals who always set the standard by constantly challenging themselves and are experts in building customized solutions in the digital marketing space. So, are you someone who wants to work with pioneering technology and enable marketers to create data-driven, omnichannel consumer experiences through data platforms? Then you could be exactly who we are looking for. Apply today and be part of a creative, innovative, and experienced team that's not afraid to push boundaries or take risks.
What will you enjoy in this role?
As a Software Engineer on the Agentic Platform team, you will contribute to design, delivery, technical strategy, and execution for critically important agent platform systems. Depending on level, you will implement well-scoped features, own end-to-end delivery, lead epics and mentor engineers, or define platform-wide architecture and engineering standards. You will help ensure the Agentic Platform scales securely and reliably to support sustained business growth across Epsilon product lines including loyalty, customer data, messaging, digital media, and enterprise AI capabilities.
Click here to view how Epsilon transforms marketing with 1 View, 1 Vision and 1 Voice.
Responsibilities
- Build and deliver large-scale cloud-native agent platform capabilities primarily on AWS, leveraging REST APIs, WebSockets, Server-Sent Events (SSE), microservices, and event-driven architectures to create highly scalable and resilient systems.
- Work hands-on across the technology stack - including Python, Django, TypeScript, React, FastAPI, Celery, PostgreSQL, Redis, OpenSearch, AWS Bedrock, Strands Agent SDK, MCP, Terraform, and Docker - to solve complex engineering challenges and maintain platform excellence.
- Design, develop, and operate agent runtime services including spec compilation, pre-flight authorization, skills seeding, MCP tool orchestration, streaming responses, and run package recording.
- Build and enhance agent builder and product UIs (Agent Cloud, Core Agent, responsive web) and shared frontend libraries using React 19, shadcn/ui, TanStack Query, and type-safe OpenAPI client generation.
- Implement MCP catalog, gateway, and federation capabilities; integrate domain MCP servers for loyalty, customer CDP, messaging, digital media, and related enterprise systems.
- Drive performance optimization, scalability, reliability, security, tenant isolation, governance, and cost efficiency across agent execution and platform services.
- Collaborate closely with global engineering, product management, architecture, AI/ML, and business stakeholders to align technical solutions with strategic business objectives.
- Own the end-to-end software development lifecycle, including requirements gathering, solution design, development, deployment, observability, and documentation.
- Contribute to observability and quality through OpenTelemetry instrumentation, Grafana/Phoenix tracing, pytest/Vitest/Playwright testing, and CI/CD pipelines.
- At Lead and Staff levels: mentor engineers, lead technical design reviews, set engineering standards, and drive cross-team initiatives for runtime performance, MCP federation, orchestration, and multi-tenant scale.
Qualifications
- Bachelor's or master's degree in computer science, IT, or related field.
- 8-11 years of experience in software engineering, including 8-10 years in technical ownership and delivery leadership roles.
- Proven ability to design and deliver scalable, distributed systems across backend, frontend, and runtime layers.
- Strong leadership skills with experience mentoring engineers, leading epics, and driving cross-service execution.
- Hands-on expertise in Python and Django (DRF/Ninja) for building production-grade APIs, data models, and async workloads (Celery).
- Strong experience with TypeScript and React ecosystems (React 19, Vite, monorepos) for modern web application development.
- Solid experience in REST APIs, microservices, containerization (Docker/ECS Fargate), and cloud-native architectures.
- Proficiency in PostgreSQL, Redis, and search/indexing systems (OpenSearch); exposure to document/graph databases is a plus.
- Deep experience with AWS services such as ECS Fargate, RDS, S3, SQS, ALB, IAM, CloudFront, and Bedrock.
- Strong understanding of asynchronous systems, messaging, and real-time communication (SSE/WebSockets).
- Experience with authentication and authorization (Okta/OIDC, JWT) in multi-tenant SaaS environments.
- Working knowledge of DevOps and IaC practices (Terraform/AWS CDK), CI/CD pipelines, and testing frameworks.
- Exposure to Generative AI technologies (LLMs, RAG, agent-based systems) with hands-on experience preferred.
Nice to have:
- Experience with Strands Agent SDK, AWS Bedrock AgentCore, LiteLLM, or comparable agent runtime frameworks.
- Experience building MCP servers or tool-calling integrations using FastMCP or similar frameworks.
- Experience with agent evaluation (DeepEval, Guardrails AI), LLM observability (Arize Phoenix, Langfuse, OpenTelemetry), and token metering.
- Experience with React Flow (xyflow) for workflow visualization, CodeMirror for in-browser editors, and declarative UI / SSE event streaming.
- Experience with Expo / React Native for mobile applications.
- Experience with A2A (Agent-to-Agent) protocol, cross-account AWS agent execution, and Step Functions / EventBridge orchestration.
- Working knowledge of Neo4j, Trino, Databricks, or Vertex AI RAG integrations.
- Experience building platforms in privacy-safe, Customer Data Platform (CDP), or Marketing Technology environments.
- Experience with GoCD, Husky pre-commit hooks, Orval OpenAPI code generation, and monorepo development workflows.
Specialization Tracks:
- Platform Backend - Django apps, APIs, Celery, PostgreSQL, tenant isolation, publishing workflows.
- Agent Runtime / AI - Strands SDK, Bedrock, MCP, RAG, evaluation, streaming, performance optimization.
- Frontend / UX - React apps, shadcn/ui, workflow editors, SSE streaming, type-safe API clients.
- Mobile - Expo / React Native companion application.
- Platform / Infra - Terraform, ECS, observability, CI/CD, cross-account AWS.
Additional Information
Epsilon is a global data, technology and services company that powers the marketing and advertising ecosystem. For decades, we've provided marketers from the world's leading brands the data, technology and services they need to engage consumers with 1 View, 1 Vision and 1 Voice. 1 View of their universe of potential buyers. 1 Vision for engaging each individual. And 1 Voice to harmonize engagement across paid, owned and earned channels.
Epsilon's comprehensive portfolio of capabilities across our suite of digital media, messaging and loyalty solutions bridge the divide between marketing and advertising technology. We process 400+ billion consumer actions each day using advanced AI and hold many patents of proprietary technology, including real-time modeling languages and consumer privacy advancements. Thanks to the work of every employee, Epsilon has been consistently recognized as industry-leading by Forrester, Adweek and the MRC. Epsilon is a global company with more than 9,000 employees around the world.
Our pillars aren't just words. They're how we show up every day.
- People centricity: We focus on employee well-being in an environment where colleagues truly care about each other.
- Collaboration: We work together, support one another, and collectively achieve goals.
- Growth: There are endless opportunities for growth through learning, development and career advancement.
- Innovation: We drive progress through cutting-edge solutions and forward-thinking approaches.
- Flexibility: We've created a balance between work and personal life, and we encourage adaptability to solve problems creatively.
Our values guide us to create value for our clients, our people and consumers.
- Act with integrity
- Work together to win together
- Innovate with purpose
- Respect all voices
- Empower with accountability
These pillars and values are our foundation-shaping our culture, guiding our decisions, and uniting us in common purpose.
Epsilon is an Equal Opportunity Employer.
Epsilon is committed to promoting diversity, inclusion, and equal employment opportunities by using reasonable efforts to attract, recruit, engage and retain qualified individuals of all ethnicities and backgrounds, including, but not limited to, women, people of color, LGBTQ individuals, people with disabilities and any other underrepresented groups, traits or characteristics.