Sr. Software Engineer - Internal Apps

DDN; New York (NY); On-site; USD 150,000 - 210,000; Full time

Job summary

DDN is seeking a Senior Software Engineer to build internal applications atop our enterprise data platform. This largely greenfield charter focuses on full-stack tools and AI-powered services for GTM, Finance, Support, and Product.

You will own frontend and backend, deployment, and model integration on GCP, with collaboration from analytics engineers and data teams to shape the data models and surface data for decision-making.

Qualifications

• 5+ years building production software with full-stack web apps.
• Strong Python APIs, data access patterns, packaging and testing.
• TypeScript/React frontend development with interactive UIs.
• Hands-on experience with GCP services and data warehouses.
• Experience deploying AI/LLM-powered applications in production.
• Experience with CI/CD, observability, and secure design.

Responsibilities

• Design, build, and operate full-stack web apps (FastAPI/Flask + React/TypeScript).
• Integrate AI/LLM features like classification, extraction, and copilots.
• Deploy and operate apps on GCP; manage auth, CI/CD, and security.
• Define product surface and building blocks for reliable services.
• Collaborate with stakeholders and data teams to scope tools.

Skills

Python

TypeScript/React

GCP

SQL

AI/LLM

CI/CD

Testing

Observability

Education

Bachelor's degree in Computer Science or Engineering

Tools

App Engine

Cloud Run

GKE

IAM

BigQuery

Job description

We’re looking for a Senior Software Engineer to build internal applications on top of DDN’s enterprise data platform. This is a largely greenfield charter — a new function dedicated to full-stack tools and AI-powered services for GTM, Finance, Support, and Product. We are building applications that surface data for decision-making and applications that improve and automate the operational processes that run the business. You’ll have early prototypes to learn from, but the mandate is to define this product portfolio and build it out. Data and analytics engineers own what’s underneath; the applications themselves — frontend, backend, deployment, model integration — are yours.

What You’ll Own

• Internal applications — design, build, and operate full-stack web apps (FastAPI/Flask + React/TypeScript today, but technology choices are open) that put data and AI into stakeholders’ hands — both as decision-support interfaces and as purpose-built tools that let them do operational work

• AI/LLM integration — build features powered by LLMs and ML — classification, extraction, summarization, copilots, agentic workflows — choosing whichever models, providers, and frameworks fit the problem

• Application infrastructure — deploy and operate apps on GCP (App Engine, Cloud Run, GKE), connect them to the data platform, manage auth, own CI/CD and app security

• Product surface — define what good looks like for this new function: which problems are worth a custom app vs. a BI dashboard, what our reusable building blocks should be, and how we ship reliable, observable services people depend on

• Collaboration — partner with stakeholders to scope the right tool for the job, with analytics engineers to shape the underlying data models, and with data engineers on platform constraints

Your Experience Includes

• 5+ years building production software, with meaningful time spent on full-stack web applications

• Strong Python — APIs (FastAPI, Flask, or similar), data access patterns, packaging, testing

• TypeScript/React (or comparable framework), component design, interactive data UIs

• Hands-on experience with GCP application services — App Engine, Cloud Run, GKE, IAM

• Strong SQL and comfort working with cloud data warehouses (BigQuery in our case) — you can write a query, understand its cost, and design an app’s data access layer around it

• Experience developing and deploying AI/LLM-powered applications in production — prompt design, structured output, evaluation, cost/latency tradeoffs, awareness that the model and tooling landscape changes quickly

• Experience operating what you ship — logging, monitoring, error handling, debugging in production

• Experience with software engineering best practices: CI/CD, automated testing, observability, secure application design

• Bachelor’s degree in Computer Science, Engineering, or equivalent practical experience

Nice to Have

• Experience building AI-native applications such as text-to-SQL interfaces, copilots, agentic workflows, or automated insight-generation systems

• Hands-on experience with one or more LLM provider APIs (Anthropic’s Claude, OpenAI, Google, open-weight models, etc.) and agent frameworks (Claude Agent SDK, LangGraph, or similar)

• Experience with managed AI/ML platforms (Vertex AI, SageMaker, or similar) — model serving, embeddings, evaluation tooling

• Familiarity with dbt and modern data warehouse patterns from a consumer’s perspective

• Experience with Airflow for triggered jobs and background work

• Familiarity with Terraform for managing application infrastructure

• Background designing data-heavy UIs — tables, drill-downs, large result sets, interactive exploration

• Prior experience as the first or only application engineer on a data team — comfort owning the full lifecycle