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Senior Full Stack Engineer

Job in Somerville, Middlesex County, Massachusetts, 02145, USA
Listing for: FyrFly Venture Partners
Full Time position
Listed on 2026-10-02
Job specializations:
  • Software Development
    Full Stack Developer, Backend Developer, AI Engineer (Applied/Software)
Salary/Wage Range or Industry Benchmark: 150000 - 190000 USD Yearly USD 150000.00 190000.00 YEAR
Job Description & How to Apply Below
About Mobi.

AI

Mobi partners with the world's leading travel brands to create AI experiences that change how people discover and book travel.

By combining deep AI expertise with more than a decade of experience in travel commerce, Mobi helps travel brands understand what travelers want, deliver more relevant experiences, and convert AI-driven intent into direct bookings. Our technology connects the intelligence of AI with the realities of travel-integrating with the systems brands already use while creating new opportunities to engage customers throughout their journey.

We're building the infrastructure that will power the next generation of travel commerce.

Working at Mobi

We believe the best ideas emerge when diverse perspectives come together, so we're building a team that truly reflects that belief. If you're energized by complex challenges, inspired by working alongside thoughtful teammates, and passionate about building technology that enhances- rather than replaces- what makes us human, you'll feel right at home here.

Our work is centered on five core values:

  • Show up, be you. We welcome every kind of thinker, maker, and teammate: quiet or bold, methodical or messy, with all their talents and quirks. Inclusion isn't a checkbox - it's how we connect, grow together, and do our best work.

  • Be scrappy, stay steady. We're resilient and quick on our feet, adapting with creativity and staying grounded when things shift.

  • Create transparency, collaborate better. We believe knowledge grows when it's shared. Clear, open communication builds trust and strengthens collaboration.

  • Foster community, be compassionate. We show up for our teammates, customers, and neighbors. Strong businesses grow from relationships built with care and grounded in shared effort.

  • Build thoughtfully, create impact. We design for clarity, build for scale, and measure success through real-world impact.

About the Role

As a Senior Full Stack Engineer, you'll join a collaborative, highly creative, and fast-paced team to design and build cutting-edge web experiences and AI-driven solutions. You'll play a key role as both architect and developer, shaping technologies that power Mobi's portfolio of travel AI products
-used by some of the world's leading brands.

This is a hands-on role with the opportunity to work across the stack- from building intuitive product experiences to developing the APIs, services, and systems that power them. You'll work closely with product, design, and other engineers to turn complex problems into simple, reliable experiences for our customers and their travelers.

Key Responsibilities
  • Develop, test, and maintain scalable MCP and agent applications using modern frameworks and libraries.

  • Build, maintain, and optimize APIs and infrastructure.

  • Collaborate with cross-functional teams to define, design, and ship new features.

  • Optimize applications for maximum speed, scalability, and performance.

  • Review code to troubleshoot, debug, and resolve issues;
    Implement best practices for code quality, testing, and maintainability.

  • Follow best practices for testing and evaluation of agent applications, including unit, integration, and end-to-end testing.

  • Stay current with trends, tools, and emerging technologies in the field of computer science and artificial intelligence.

Qualifications
  • Bachelor's degree in Computer Science, Engineering, or related field or equivalent practical experience.

  • Proficiency in Python.

  • Familiarity with testing frameworks (e.g., Jest, Cypress, Playwright).

  • Proficiency with backend APIs and RESTful services.

  • Experience with AWS compute and storage services (e.g. Lambda, DynamoDB).

  • Experience and comfort using AI Tools (CodeX, Claude Code, Copilot, etc.) to automate workflows.

  • Strong problem-solving skills and a…

Position Requirements
10+ Years work experience
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