Back End Developer

Build Antibrittle Agents With Us

https : / / jobs.gem.com / southbridge-ai / am9icG9zdDoargQV0uUom0F1c9EN2wkd

Any expression of intelligence is a transformation of data.

At Southbridge, we make that transformation reliable. We are a team of engineers and researchers building the first agentic data layer—systems where long-horizon AI agents can ingest, structure, and retrieve enterprise data without shattering. We call these antibrittle agents : orchestration stacks that get stronger the longer they run, because we design them with room to adapt.

Why Context Comes First

AI models keep getting sharper, but most still feel like brilliant interns who can’t find anything. The bottleneck is context. Vector stores slice documents into fragments. ETL scripts drift out of date faster than they’re written. Enterprises teach new team members the shape of their data over six-year journeys—then watch the schema change.

We build for the people who live that frustration. Our walking-RAG pipelines read 1,000-page manuals, engineering diagrams, and telemetry streams without losing their relationships. Tadpole, our long-horizon runner, keeps Claude-class models productive for hours by trenching state, resetting cleanly, and capturing receipts with every step.

How We Think

• Context, not chunks – Every table remembers its document; every value knows its column. We keep structure intact from ingestion to retrieval.
• Agents, not brittle pipelines – Static workflows crack when reality shifts. Our agents reason about ingestion, transformation, and retrieval in real time and adapt when schemas move.
• Receipts above claims – We care about “nines of accountability.” Costs, decisions, failures, recoveries—everything is inspectable, everyone holds the same bar.
• Building blocks, not black boxes – We publish what we can under Apache 2.0 because shared primitives help us move faster and keep us honest. Offmute, diagen, wishful-search, tip20, next-cursor-base - they all started as tools we needed first.
• 180s are expected – Models evolve weekly. When the data asks us to change direction, we do it together.

What You’ll Work On

Your first few months are collaborative by design. You’ll co-own a meaningful slice of Tadpole, ship it to real users, and share at least one internal note or open-source artefact. We’ll bring you into customer deployments early so you see the stakes up close.

What We’ve Already Built

Backend Engineer

Full-time

https : / / jobs.gem.com / southbridge-ai / am9icG9zdDoargQV0uUom0F1c9EN2wkd

We’re building Tadpole—the execution engine that keeps long-horizon agents steady for hours instead of minutes.

As a backend engineer at Southbridge, you’ll design the trenches, receipts, and orchestration logic that let Claude-, Gemini-, and Kimi-class systems ingest enterprise data, reason across trillions of schemas, and recover gracefully when reality shifts. You’ll be shoulder to shoulder with teammates who have lived those shifts already and are eager to share the patterns, runbooks, and cautionary tales.

What You’ll Build

During your first few months, you’ll co-own a slice of Tadpole’s execution state or tooling APIs with another engineer, ship it to production, and share at least one internal note or open library that survives external scrutiny. We’ll bring you along for a customer deployment early—expect the rest of us on the call, comparing notes in real time.

Stack & Tooling

How We Work Together

What You Bring

Signals We Love

Why This Work Matters

You’re building new primitives. The orchestrators you shape become the infrastructure others lean on when they want AI systems that actually understand their data. We work on real problems—1000-page technical manuals, multi-modal telemetry, cross-border compliance datasets—where “pretty good” isn’t enough. You’ll learn at the frontier; we test major model releases as they land, implement papers while the ink dries, and swap notes with the community through our open-source work.

How to Start the Conversation

Bring logs or a story about the longest agent run you’ve tamed—we’re always happy to swap notes.

https : / / jobs.gem.com / southbridge-ai / am9icG9zdDoargQV0uUom0F1c9EN2wkd