Senior Software Engineer – Apps, APIs

Recast

Senior Software Engineer developing customer-facing applications and APIs for Recast's marketing mix modeling platform. Collaborating with teams to shape and build efficient solutions.

Posted 5/28/2026full-timeRemote • New York • 🇺🇸 United StatesSenior💰 $140,000 - $190,000 per yearWebsite

Tech Stack

Tools & technologies

PythonRubyRuby on Rails

About the role

Key responsibilities & impact

Help take our MCP server from early-stage to production-grade: design decisions, implementation, and all the rough edges in between
Contribute to our public APIs: clarity, consistency, and best practices matter more than ever as our users are increasingly building AI-powered workflows
Build backends for agentic apps: the patterns for this greenfield work are still being defined and you'll have a strong voice in how we build
Work closely with the EM and your teammates to shape how this team builds: you’ll have real opportunity to help define what good looks like here, not just execute against it

Requirements

What you’ll need

Strong Python engineer: you write idiomatic Python, design and ship production APIs in it, and it's your natural default
Comfortable enough in Ruby (Rails) to navigate the codebase, give useful PR reviews, and contribute without needing to be carried
Designing and shipping APIs with real external consumers: developer experience, versioning, and reliability are priorities for you
Shipping in an environment where "good enough to learn from" is a real engineering value, not a compromise
Hands-on experience with MCP and agentic AI patterns: you've built real tools, integrations, or apps in this space

Benefits

Comp & perks

Work wherever you’re happiest. We're fully remote
Competitive remote salary along with early-stage equity
Highly skilled coworkers you can learn from and who are eager to learn from you
An async-first culture with a focus on documentation over standing meetings
Autonomy and support to do your best work in your own time
Your local holidays plus unmetered PTO (minimum 2 weeks mandatory PTO!)

ATS Keywords

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Hard Skills & Tools

PythonRubyAPI designProduction APIsVersioningReliabilityMCPAgentic AI patternsIntegration developmentBack-end development

Soft Skills

CollaborationCommunicationDesign decision-makingProblem-solvingAdaptabilityTeamworkLeadershipUser experience focusMentorshipCritical thinking