Software Engineer 3

Responsibilities

You will design and implement agent and developer-facing integrations for the Application Modernization Platform, ensuring reliable communication between services and AI agents. You will also build instrumentation for observability and collaborate with cross-functional teams to maintain high-quality, production-ready code.

Requirements

Candidates must have at least four years of experience building and operating production software services with proficiency in backend languages like Python, Go, Java, or TypeScript. Strong experience in API design, authentication mechanisms, and distributed systems is required.

Skills

• Software engineering
• Python
• Go
• Java
• TypeScript
• API design
• OAuth
• Distributed systems
• Automated testing
• Continuous delivery
• Debugging
• Technical communication
• Cloud platforms
• Database migration
• Agentic integrations
• Service-to-service identity

Benefits

• Equity
• Employee stock purchase program
• Flexible paid time off
• 20 weeks fully-paid gender-neutral parental leave
• Fertility and adoption assistance
• 401(k) plan
• Mental health counseling
• Transgender-inclusive health insurance coverage
• Health benefits

About this role

MongoDB’s Application Modernization Platform (AMP) helps organizations modernize legacy applications and move their workloads and associated data from relational databases to MongoDB. Our customers need a dependable way to bring analysis, transformation, testing, and migration capabilities into their modernization workflows.
The Agentic Integrations team builds the interfaces that let AMP capabilities be discovered, invoked, and orchestrated from AI agents and development environments. We expose product services through consistent, well-specified tool and API surfaces, keep authentication and execution context correct across every boundary, and make each integration observable and safe to operate. Our work is what makes AMP usable from the assistants and coding agents our customers already run.
We are looking for a Software Engineer 3 to build and operate these integrations. You will design tool and API surfaces for AMP services, implement them end to end, and work with product and platform engineers so that they behave predictably when a model calls them. Your impact will be measured by how reliably agents and developers can invoke AMP capabilities, and by how much integration work your components remove for other teams.
We are looking to speak to candidates who are based in New York City for our hybrid working model.
What you will do
Design and implement agent and developer facing integrations for AMP services, including tool definitions, API clients, and the adapters between them
Define clear input and output contracts for each integration, including validation, error semantics, and behavior when a call is malformed or only partially succeeds
Propagate authentication, authorization, and tenant context across integration boundaries so that agent-invoked calls carry no more privilege than the user they act for
Build the instrumentation needed to observe agent-driven traffic, including structured logs, traces, latency and failure metrics, and actionable diagnostics
Write production-quality code and the unit, integration, and end-to-end tests that demonstrate correctness, including tests for nondeterministic model behavior
Diagnose failures that span service, tool, and model boundaries, and drive them to root cause
Contribute integrations to shared SDKs, command-line tools, and agent frameworks used by other teams
Collaborate with product managers, platform engineers, and partner teams on scoped initiatives, and break work into incremental deliverables
Participate in code reviews, design reviews, and technical discussions that raise the quality of the team’s work
Interview candidates and mentor engineers and interns
What you bring
Required
At least four years of experience building and operating production software services
Proficiency in a backend language such as Python, Go, Java, or TypeScript, with the judgment to work effectively in more than one
Experience designing APIs or service interfaces, including versioning, error handling, and backward compatibility
Practical experience with authentication and authorization mechanisms such as OAuth, API keys, or service-to-service identity
Experience with automated testing, continuous delivery, and debugging in distributed systems
Strong written and verbal technical communication skills
A collaborative approach and the ability to make realistic assessments of project complexity and delivery risk
Preferred
Experience building tool or integration surfaces for AI agents or large language models, including execution context, tool schemas, or guardrails against nondeterministic behavior
Experience with the Model Context Protocol or a comparable agent-to-tool integration standard
Experience shipping developer tooling such as CLIs, SDKs, or local servers that run inside customer-managed environments
Familiarity with application modernization, relational databases, MongoDB, or automated code transformation
Experience working with customers or field teams on integration and deployment issues
Experience mentoring engineers or interns and contributing to technical hiring
Candidates with additional relevant experience may be considered for more senior roles.
What success looks like
In your first month
Build a working understanding of AMP’s architecture, the team’s integration patterns, and the development and testing workflow.
Ship small, well-scoped integration fixes and contribute effectively to code reviews.
In your first three months
Own delivery of an integration for one AMP capability, from interface definition through production rollout.
Establish the tests and telemetry that let the team detect and diagnose failures in that integration.
In your first six months
Take regular ownership of code reviews and participate meaningfully in design reviews for agent-facing interfaces.
Independently drive a scoped technical project from investigation through implementation and validation, coordinating with the partner team that consumes it.
In your first twelve months
Lead the development of a substantial integration or reusable component that other teams adopt.
Help mentor new engineers and contribute to the team’s integration standards and technical direction.
Why MongoDB
At MongoDB, you will work with engineers who care deeply about developer experience, data correctness, and the interfaces that other software builds on. The Agentic Integrations team sits where the data platform meets the agentic tooling our customers are adopting, so your work will be visible in the products and assistants they use every day. You will have the scope to shape how AMP capabilities are exposed, and the support to grow into deeper ownership of the integration layer.
MongoDB is committed to creating a supportive and inclusive environment where employees can grow and do their best work. Our benefits and employee programs are designed to support people through every stage of their professional and personal lives.
About MongoDB
MongoDB is built for change, empowering our custom...

About MongoDB

Software Development · 5,001-10,000 employees · headquartered in New York, NY · founded 2007