Senior Growth Full-Stack Engineer, Seamless.AI

Seamless.AI

Location:
United States

Category:
IT - Software Development

Contract Type:
Employment contract

Salary:

Not provided

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Job Description:

Senior Growth Full-Stack Engineer role at Seamless.AI focusing on user activation, engagement, and onboarding through experimentation and data-driven approaches

Job Responsibility:

Collaborate with growth, product, and data teams to design and implement A/B tests and growth experiments focused on user activation
Build, deploy, and maintain full-stack features and experiment infrastructure (frontend + backend)
Implement and manage feature flagging systems to enable rapid testing and controlled rollouts
Work with GrowthBook (or similar experimentation platforms) to set up, track, and analyze experiments
Instrument and track user behavior in Amplitude and other analytics platforms to generate insights
Write clean, scalable, and maintainable code across the React frontend and Node.js backend
Monitor and evaluate experiment outcomes, providing actionable insights and recommendations
Balance speed of experimentation with engineering best practices, ensuring quality while moving quickly

Requirements:

5+ years of experience as a full-stack engineer (startup or growth-focused environment preferred) with SaaS product
Strong proficiency in modern JavaScript/TypeScript (React.js, Node.js)
Proficiency with modern database technologies (PostgreSQL, Vector DBs, OpenSearch, DynamoDB)
Proficiency with Cloud architecture and scalability best practices, in particular AWS (Lambda, serverless, cloud-native services)
Hands-on experience with A/B testing platforms (GrowthBook, Optimizely, LaunchDarkly, etc.)
Familiarity with feature flag systems and controlled experiment rollout strategies
Experience with product analytics tools (Amplitude, Segment, Tableau)
Ability to translate growth hypotheses into technical experiments quickly and iteratively
Strong data-driven mindset with the ability to evaluate experiment outcomes statistically
Comfortable working in fast-moving, cross-functional growth teams
Bachelor's degree in Computer Science, Engineering, or a related field (or equivalent practical experience)
Proven experience delivering full-stack features and experiment infrastructure in a fast-paced environment
Demonstrated ability to collaborate across engineering, product, and growth teams
Strong problem-solving and analytical skills with a data-first approach

Nice to have:

Background in PLG, growth engineering, activation, or onboarding-focused roles
Experience with event-driven architecture and scalable systems
Familiarity with in-app education & onboarding tooling (e.g., Userflow)
Familiarity with Pinecone and LLMs
Experience building SaaS applications in the B2B or productivity space

Additional Information:

Job Posted:
September 06, 2025

Employment Type:

Fulltime

Work Type:

Remote work

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Senior Growth Full-Stack Engineer