Senior Python Engineer

Zapcom Group Inc

United States

4 days ago

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Role details

Contract type

Permanent contract

Employment type

Full-time (> 32 hours)

Experience level

Expert

Experience required

5 years minimum

Working hours

Regular working hours

Job source

www.dice.com

Tech stack

Application Programming Interfaces (APIs) Amazon Web Services Audit Trail Software as a Service Identity and Access Management Python (Programming Language) Node.Js OAuth Systems Integration Data Logging Large Language Models Claude Code

+9 more

Software Security Caching Backend Pytest Ruff — Fast Python Linter and Code Formatter Claude Evaluation of Large Language Models Agent SDK Microservices

Job description

Set up the blueprint’s verticals across Messages API, Agent SDK, and Managed Agents runtimes. Run test and verification suites and maintain fork compatibility.
Integrate Agent Trust into StorefrontBackend and MerchantBackend, including session-start identity binding, cart and checkout trust checks, native result/error mapping, per-hook failure policies, PII-free decision logging, and outcome reporting.
Build and test the storefront MCP server integration for Managed Agents behind an authenticating gateway, supporting vault credentials and signed identity claims.
Develop an Experian MCP server with advisory tools and a companion skill for the commerce-builder Claude Code plugin.
Write merchant integration guides and measure adoption effort through files changed, lines changed, prompt bytes, gates, and time to the first verified session.
Implement OAuth token exchange under RFC 8693 with an enterprise identity provider, using audience-scoped downstream tokens without passing through the user’s token.
Embed trust verification into AWS-hosted agent runtimes, such as Bedrock worker agents or Lambda/ECS services, with enforcement in application code outside the model.
Build a shopping-agent evaluation harness covering tool calls, purchase correctness, prompt injection, incorrect items, and overspending, with reproducible CI runs.
Develop backend services for regulated financial-services use cases, including typed APIs, audit logging, permissible-use checks, and idempotent operations.

Requirements

Five or more years building production Python microservices for modern SaaS backends.
Strong experience with asyncio, typed Python, pytest, and ruff.
API security experience covering OAuth 2.0 client credentials, on-behalf-of/token exchange flows, JWT issuance and verification, JWKS rotation and caching, and secrets handling.
Microservices experience, including service-to-service authentication and structured error/result handling across service boundaries.
Ability to reason about fail-open versus fail-closed behaviour within latency constraints.
Ability to understand unfamiliar or unmaintained codebases quickly and support technical claims with module and line references.
Ability to deliver independently from written acceptance criteria., * Production OAuth token exchange experience under RFC 8693, including audience validation, scope narrowing, and confused-deputy prevention.
Production AWS experience with Lambda or ECS, IAM, and Secrets Manager.
Experience shipping tool-using LLM agents through Claude Messages API or Agent SDK.
Understanding of prompt caching and static-prefix requirements.
Experience building or integrating authenticated MCP servers using streamable HTTP.
Experience building or extending LLM evaluation harnesses.
Familiarity with Claude Managed Agents, Claude Code plugins/skills, and Bedrock, Vertex, or Foundry routing.
E-commerce experience covering carts, product variants, and checkout hand-off.
Node.js 22 experience for example storefront integrations.

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