Software Engineer III - Full Stack (React + Java/Go)

About The Opportunity We're looking for a Software Engineer III to join the FanApp team on a Contract-to-Hire basis, with the intent to convert to full-time employment for the right candidate. In this role, you will help build the next-generation shopping experience within a universal FanApp, creating intuitive, high-impact journeys that improve discovery, personalization, engagement, and conversion for sports fans.

You'll work full-stack across both the client and server side of FanApp — primarily the app's web view (frontend) and backend services in Golang and Java — partnering closely with product, design, data, and platform teams to deliver reliable, performant, and measurable experiences end to end. This role is a strong fit for an engineer who has already operated as a tech lead: someone who can challenge requirements, drive technical design, and bring a senior, steady hand to a growing team while raising the bar on quality, ownership, and technical direction.

Responsibilities

• Design, build, test, and ship high-quality full-stack experiences for FanApp — from the app's web view through backend services — across search, recommendations, merchandising, promotions, and product discovery.
• Own backend services in Golang and/or Java, and build robust integrations with backend APIs and services, with careful attention to performance, reliability, and maintainability.
• Operate as a technical lead on well-scoped projects: understand and challenge requirements, vet and validate technical design documents, and present designs at the team's weekly design review meetings (revising and re-presenting as needed).
• Break down work into clear, actionable tasks for the team, and provide timeline, effort estimation, and delivery commitments.
• Implement instrumentation and eventing that help the team understand fan behavior, feature adoption, experimentation outcomes, and funnel performance.
• Partner with product managers, designers, and engineers across teams to translate business goals into scalable technical solutions and deliver them with high quality.
• Identify and resolve performance bottlenecks, improve app responsiveness, and help create exceptional fan experiences.
• Write clean, well-tested, maintainable code and contribute to code reviews, documentation, automation, and engineering best practices.
• Take ownership of well-scoped projects, drive execution from design through launch, and help improve team efficiency and delivery quality.
• Support production excellence by debugging issues, improving observability, and contributing to a strong quality and release culture.
• Stay current with technology trends — especially in the frontend space — and bring an AI-forward mindset and thought leadership to the team's technical direction.

Required Qualifications

• Bachelor's degree in Computer Science or a related field, or equivalent practical experience.
• 7+ years of professional software engineering experience building consumer-facing applications or platforms, full-stack (client and server side).
• Prior experience operating as a Tech Lead: vetting technical designs, presenting at design reviews, breaking work down for a team, and owning timelines and delivery.
• Hands-on backend experience in Golang or Java (at least one required; comfortable picking up the other).
• Strong experience with modern frontend or app development technologies and patterns, including component-based UI development and API-driven applications; solid foundation in React, JavaScript or TypeScript.
• Experience integrating with backend services using RESTful APIs and building resilient client-side data flows.
• Experience writing unit and integration tests and contributing to a culture of code quality and continuous improvement.
• Demonstrated ownership, accountability, and proactivity — able to take on complex, ambiguous projects and reliably deliver on time.
• An AI-forward mindset, with a track record of bringing thought leadership on technology and engineering practices to a team.
• Strong problem-solving, debugging, collaboration, and communication skills.
• Able to commit full-time; the environment is complex and takes real time to ramp up in.
• Strong experience with Java or Golang.

Nice To Have Skills

• Some familiarity with native mobile development is useful context, though not required (native app work is owned by a separate team).
• Experience building high-scale ecommerce experiences.
• Experience with search, recommendations, personalization, experimentation, or merchandising systems.
• Familiarity with analytics and event instrumentation for consumer products.
• Experience improving performance, observability, and release quality for customer-facing applications.
• Experience working in cross-functional product and engineering teams in a fast-paced environment.

Avenue Code discloses salary range information based on our commitment to fairness and transparency. We consider a wide range of factors such as internal equity, geographic location, relevant education, qualifications, certifications, experience, skills, seniority, business or organizational needs, and others. At Avenue Code, it is not typical for an individual to be hired at or near the top of the range for their role, and compensation decisions are dependent on the facts and circumstances of each case. A reasonable estimate of the current range for a Senior Full Stack is from $145k to $150k yearly. Avenue Code reinforces its commitment to privacy and to all the principles guaranteed by the most accurate global data protection laws, such as GDPR, LGPD, CCPA and CPRA. The Candidate data shared with Avenue Code will be kept confidential and will not be transmitted to disinterested third parties, nor will it be used for purposes other than the application for open positions. As a Consultancy company, Avenue Code may share your information with its clients and other Companies from the CompassUol Group to which Avenue Code’s consultants are allocated to perform its services.