Senior Backend Engineer – MCP Infrastructure

🕒 June 10

🇦🇷 Argentina – Remote

💵 $4k - $5k / month

⏰ Full Time

🟠 Senior

🔙 Backend Engineer

👻 Ghost score 34%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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OneSeven Tech (OST)

WebsiteLinkedInAll Job Openings

11 - 50 employees

💼 Consulting

🏥 Healthcare

📦 Logistics

Consulting • Healthcare • Logistics

OneSeven Tech (OST) is a digital product studio specializing in software design and engineering for startups, SMBs, and enterprises. With a team of global software and AI experts, OST has been in business for 7 years, successfully completing 88 projects for over 62 clients across various industries. The company focuses on providing services such as product strategy, web and mobile app development, and AI/ML integration. Known for its innovative solutions, OST has expanded its expertise from startups to large enterprises, including publicly traded companies. Their services cater to clients at every stage, from idea generation to growth and enterprise scaling. OST prides itself on a 4. 9 out of 5-star rating from clients for on-time delivery and high-fidelity designs, successfully meeting regulatory requirements in sectors like healthcare with HIPAA compliance.

📋 Description

• 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

• 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

• $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