Senior Back End Engineer (Ruby on Rails & GO)

At the company, we are the fastest-growing sports company in North America, as recognized by Inc. 5000. As the leading platform for Daily Fantasy Sports, we cover a diverse range of sports leagues, including the NFL, NBA, and Esports titles like League of Legends and Counter-Strike. Our team of over 550 employees thrives in an inclusive culture that values individuals from diverse backgrounds, regardless of their level of sports fandom. Ready to reimagine the DFS industry together?

Overview

At the company, we are changing the game in daily fantasy sports. We are a passionate team of innovators dedicated to creating a best-in-class experience for our members. Our engineering team builds and scales the platform that powers our explosive growth from real-time contest engines to the services that handle millions of daily transactions. We are looking for a talented and driven Senior Software Engineer to join our Back Office team and help us build the internal platform that powers every operation at the company.

Job Summary

We are seeking an experienced Senior Software Engineer fluent in both Ruby on Rails and Go to join our Back Office team. Back Office is the internal operational platform used by Game Ops, Trading, Member Operations, and Risk teams to configure projections, trade lines, manage members, review risk, and monitor live scoring — all of which directly shapes what millions of members see in the app.

In this role, you will design and build backend services that span our Rails monolith and our growing ecosystem of Rails and Go microservices. You will work across existing as well as new services being carved out as we migrate toward a microservices architecture. You will tackle high-scope, complex technical problems, own features end-to-end, and mentor engineers on your team. This is a role for someone who is equally comfortable extending a mature Rails codebase and greenfielding a new Go service, and who is energized by the challenge of a platform in active, deliberate evolution.

What You'll Do

• Build and own backend services : Design and implement features across both Rails-based services and Go microservices — from API contracts through deployment and monitoring.

• Support the migration to microservices : Help decompose the Rails monolith into well-scoped, independently deployable services, contributing to architectural decisions about what to extract and how.

• Power internal tooling APIs : Build and maintain the backend APIs that Back Office operators depend on for real-time decisioning — projection management, risk dashboards, alerting, and member operations.

• Own technical delivery : Lead the design and implementation of complex features end-to-end, from product requirements through production deployment.

• Drive system reliability : Diagnose and resolve performance bottlenecks, optimize database queries, and improve resilience of backend systems under load.

• Define technical direction : Propose and drive architectural decisions for your team's services, evaluating tradeoffs and communicating recommendations clearly to engineers and stakeholders.

• Mentor and elevate : Provide hands-on mentorship to Software Engineers I, II, and III through code reviews, pairing, and technical guidance.

• Improve engineering practices : Advocate for and improve best practices around code quality, testing, observability, and deployment for the team.

• Collaborate cross-functionally : Work closely with Product Managers, QA, and other engineering teams to translate operational goals into well-scoped technical solutions.

• Participate in on-call rotation : Share responsibility for production incidents, contributing to root cause analysis and long-term reliability improvements.

What You Have

Experience

• 5–8 years of professional software engineering experience, with meaningful production time in both Ruby on Rails and Go

• Proven track record of owning and delivering complex, multi-component features in a team environment

• Experience working across monolith-to-microservices migrations, extracting services, managing dual-write patterns, and maintaining backward compatibility

• Experience designing and operating distributed systems or event-driven architectures

Technical Skills

• Strong Rails proficiency — you understand the framework deeply, write idiomatic Ruby, and know when to leverage or work around Rails conventions

• Strong Go proficiency — you write idiomatic, well-tested, production-quality Go code

• Solid PostgreSQL skills, including schema design, query optimization, and performance tuning

• Solid understanding of API design (REST and/or gRPC) and service boundary design

• Experience with asynchronous workflows — background job processing (Sidekiq or similar), message queues, or event streaming

• Experience with containerization (Docker) and orchestration (Kubernetes)

• Familiarity with CI/CD pipelines and deployment automation

• Understanding of observability practices — logging, metrics, tracing

Working Style

• Comfortable working autonomously with minimal direction on ambiguous problems

• Effective communicator who can articulate technical decisions to both engineers and non-technical stakeholders

• Able to context-switch between deep technical work and collaborative planning

• Experience working in a fully remote engineering organization

What Makes You Stand Out

• Hands-on experience with event-driven architectures using Pulsar, Kafka, or similar — our platform relies heavily on async messaging between services

• Experience with NATS request/reply or JetStream patterns

• Familiarity with internal tooling or operator-facing platforms (not just member-facing products)

• Experience in high-traffic, real-time systems — sports, gaming, fintech, or adtech

• Familiarity with infrastructure tooling (Terraform, Kubernetes, ArgoCD)

• Experience in the daily fantasy sports or sports betting industry

• Experience leveraging AI-assisted development tools across the development lifecycle — coding, planning, scoping, and code review

• Experience integrating AI tooling into engineering workflows to accelerate team productivity

Where You'll Live

While we prefer candidates based in Atlanta, we are open to qualified applicants from anywhere in the U.S. and are willing to consider remote candidates. #LI-Remote

Working at the company

The typical salary range for this position is $175,000 to $185,000. At the company, we consider your role, level, and where you’ll be working when determining our salary ranges. The compensation info you see on our job postings gives you an idea of the starting pay range for the position. Your actual pay within that range will depend on your specific work location, as well as your skills, experience, and education. Your recruiter will be happy to chat more about the specific pay range for your location and how we arrived at it during the hiring process.

This application period will remain open for 30 days. We’re committed to finding the best candidate, so this date may be adjusted, and any changes will be reflected in this posting.

Date Posted: 6/10/2026

First Extension: 7/10/2026

Second Extension: 8/9/2026

Benefits you’ll receive

In addition to your great compensation package, full-time employees will be eligible for the following perks:

• Company-subsidized medical, dental, & vision plans

• 401(k) plan with company match

• Annual bonus

• Flexible PTO to encourage a healthy work/life balance (2 weeks STRONGLY encouraged!)

• Generous paid leave programs, including 16-week paid parental leave and disability benefits

• Workplace flexibility and modern work schedules focused on getting the job done, not hours clocked

• Company-wide in-person events and team outings

• Lifestyle enhancement program

• Company equipment provided (Windows & Mac options)

• Annual performance reviews with opportunities for growth and career development

You must be authorized to work for any employer in the U.S.  We are unable to sponsor or take over sponsorship of an employment Visa at this time.

The company is an Equal Opportunity Employer.  All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran or disability status.