Senior Backend Engineer – MCP Infrastructure

OneSeven Tech (OST)

Senior Backend Engineer designing and implementing MCP server architecture for a fast-moving AI software project. Collaborating with a senior engineer and owning implementation quality.

Posted 6/10/2026full-timeRemote • 🇦🇷 ArgentinaSenior💰 $4,000 - $5,000 per monthWebsite

Tech Stack

Tools & technologies

CloudJavaSpringSpring BootSpringBootSQL

About the role

Key responsibilities & impact

Build and ship MCP server components
Design the backend architecture for tool-use and agent orchestration layers integrated into an existing Java/SQL Server stack
Own the implementation quality — not just writing code, but defining patterns the team can follow
Collaborate daily with the existing AI Engineer as MCP and agent workstreams intersect
Contribute to technical decisions with your own perspective — this is a peer relationship, not a directive one

Requirements

What you’ll need

5+ years of hands-on Java development with Spring Boot and WebFlux — not framework familiarity, but deep OOP fundamentals and the ability to architect complex systems from the ground up
Experience integrating on-premises systems with cloud-hosted services — the core architecture requires bridging existing on-prem infrastructure to a cloud-deployed agent layer
Production experience integrating LLM tooling: MCP protocol, function calling, or tool orchestration patterns in a live environment
Strong system design instincts — you can design, document, and defend an architecture before writing a line of code
SQL Server at scale — schema design, query optimization, data modeling for high-throughput systems
Comfortable working alongside a client-side senior engineer as a peer, not under supervision
Near-native English — daily async and sync communication directly with a US-based technical lead and client stakeholders

Benefits

Comp & perks

$4000 - 5000/month — paid in USD, bi-weekly via Deel
US Eastern Time hours (EST ) — Monday to Friday, 9:00 AM–6:00 PM EST
Fully Remote — work from anywhere in Latin America
Long-term contract — starting with a 6-month contract, with potential to extend
Paid PTO — accrual begins after 3-month trial period
Referral Program — earn a bonus for referring talent that gets hired

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

JavaSpring BootWebFluxOOPSQL ServerLLM toolingMCP protocolfunction callingtool orchestrationsystem design

Soft Skills

collaborationcommunicationpeer relationshipdefending architecturedesign documentation