Principal Software Engineer

Swiftly is the AI platform purpose-built for retail, serving retailers, wholesalers, and brands. Swiftly's AI agents unify data, automate workflows, and power the marketing that drives measurable business growth. Swiftly AI is built on the industry's largest proprietary retail dataset: live transactions, 9 million products, and the closed-loop campaign outcomes of 33,000 stores.

Trusted by leading retailers, wholesalers, and hundreds of iconic brands, Swiftly unifies data across the retail ecosystem to accelerate growth and power the connected, personalized experiences that drive lasting shopper loyalty.

Position Summary:
Swiftly is searching for a Principal Software Engineer to lead the architecture of our ads and martech platform: the systems that author retail media campaigns, generate creatives and serve ads to shoppers through The Trade Desk. The platform spans a Go ad server built for low-latency bid requests, Python services on Azure Functions for campaign authoring and tenant configuration, Kotlin/Quarkus services we are carving apart, and a shared PostgreSQL schema managed as code. This role will set technical direction across these teams, lead a tenant-by-tenant migration off legacy services without downtime, and stay hands-on in the hardest code.

Responsibilities Include:

Work with and provide direction to the teams that build Swiftly's ads and martech platform, including the Go ad server, campaign authoring, the tenant and capability registry, creative generation and personalized-ad services

Architect, code and maintain large scale distributed systems with complex requirements

Lead the incremental migration of campaign authoring and The Trade Desk write path off a Kotlin/Quarkus service, one retailer at a time, using per-tenant ownership switches, database write guards and shadow-diff dry runs to cut over safely

Own the performance and reliability of the Go ad server against strict SLOs (p50 at or under 40 ms, p99 at or under 1 s, 2 s hard deadline), using in-process caching, circuit breakers, connection pooling and profiling

Design the data contracts shared between services: declarative schema-as-code with Atlas, versioned database views as serving contracts, and transactional outbox and projector patterns for side effects

Partner with data engineering on Databricks pipelines for personalized rankings, identity resolution and the impression data that feeds attribution and iROAS

Build safe, auditable integrations with The Trade Desk GraphQL API, Salesforce and creative-rendering services, with idempotent, lock-protected pushes and full write audit history

Utilize expertise with microservices architecture and database design

Operate production services, including on-call and incident management

Contribute to a multi-tenant platform architecture

Guide the platform from AKS with ArgoCD and Kustomize toward Azure Container Apps and Azure Functions, with runtime configuration in Azure App Configuration and identity through Entra ID and Key Vault

Set the engineering quality bar: strict typing and linting, unit, integration and end-to-end tests with Testcontainers, CodeQL and dependency scanning, release automation in GitHub Actions, and AI-assisted development

Working collaboratively in an ambiguous, fast-paced environment

Take ownership of domain from the ground up, from architectural decisions to coding to testing to operations

Other related duties as assigned

Required Qualifications:

Bachelor of Science in Computer Science, Computer Engineering, Mathematics or a related field or comparable industry experience

10+ years of industry experience designing, building, and maintaining large-scale software services, ideally in a multi-tenant environment

Confidence writing production code in Go and Python, and working in Kotlin or Java services

Expertise with PostgreSQL (query performance, migrations, views), Kubernetes, event streaming such as Azure Event Hubs or Kafka, and API frameworks such as FastAPI or Quarkus

Experience building and running services on Azure and/or AWS

Experience building low-latency, high-throughput services against defined SLOs, with observability through OpenTelemetry, Prometheus, Loki, Pyroscope and Grafana

Experience with CI/CD in GitHub Actions, GitOps deployment and infrastructure as code such as Terraform

Ad tech experience: ad servers, DSPs such as The Trade Desk, impression tracking, and campaign measurement or attribution

Experience with Databricks or Spark data pipelines

Experience with Atlas schema migrations, SQLAlchemy/SQLModel or pgx, and Azure Functions or Container Apps

Experience using AI coding agents in daily development

This position is not eligible for visa sponsorship. Applicants must be authorized to work in the U.S. without the need for current or future sponsorship

Preferred Qualifications:

Experience with retail-oriented solutions and Saas

Mix of startup and large software company experience

Note: This position is not eligible for visa sponsorship. Applicants must be authorized to work in the U.S. without the need for current or future sponsorship.

Working For Swiftly

We are working on a set of problems that require the best in the industry to get right. Our employees are the pillars of the future of the company and they are treated and compensated as such. We're a growing team of experienced industry professionals building an organization that can solve tough problems and values a collaborative environment.

Every Swiftly employee:

-Has demonstrated the ability to work collaboratively in an ambiguous, fast-paced environment

-Takes ownership of their domain from the ground up, from inception through deployment to customers

-Leaves their ego at the door and ensures the best idea leaves the room

-Is always experimenting with new technologies and learning new skillsets

If you've ever wanted to work on a project that blends a gorgeous consumer experience, sophisticated logistics, and scale that rivals the largest technology players, Swiftly is the place for you.

Equal Opportunity Employer

Swiftly is an Equal Employment Opportunity and Affirmative Action Employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, or disability status. 

Swiftly will make reasonable accommodations in compliance with the Americans with Disabilities Act of 1990. Reasonable accommodations are available for qualified individuals with disabilities throughout the subsequent application process.

Originally posted on Himalayas