Back-end Developer

Backend Developer

About Altum
Altum Software is a technology company building AI-powered infrastructure for sales and business automation. We design and develop internal systems that replace manual workflows with autonomous AI agents — from lead qualification pipelines to customer communication layers. We're a small, senior team that moves fast and builds things that actually work in production. No corporate overhead, no pointless meetings — just interesting problems and real ownership over what you ship.

The Role
We're looking for a Backend Developer to join the team building our AI automation infrastructure. You'll own the server side of systems that operate at scale — managing concurrent sessions, orchestrating background jobs, integrating LLMs into real-world workflows, and making sure everything stays stable when it matters.
This is a hands-on backend role with real architectural responsibility. You'll work directly with the founding team and have full visibility into product decisions.

What You'll Be Working On
Building AI SDR systems — autonomous agents that manage communication pipelines, qualify leads, and move them through the funnel without manual intervention
Developing browser automation layers that interact with web platforms on behalf of AI agents — handling sessions, actions, and anti-detection logic at scale
Integrating LLMs (Claude API) for real-time message classification, context-aware response generation, and conversation management across hundreds of active threads simultaneously
Building the job orchestration layer — queues, background workers, concurrency handling — that keeps everything running reliably at scale
Designing data models and APIs that the rest of the system runs on
Connecting the system with external tools: CRM, calendar booking, messaging platforms, alert systems
Designing internal AI agents that handle repetitive customer-facing workflows autonomously, escalating to humans only when needed

Requirements
2+ years of commercial backend experience
Strong understanding of system design — queues, background jobs, concurrency, failure handling
Solid experience with relational databases (PostgreSQL or similar) — schema design, query performance
Experience building and maintaining APIs and services in production
Comfortable integrating third-party APIs and navigating unfamiliar documentation quickly
Systematic thinker — you see how components compose into a reliable whole
Genuine curiosity about AI tooling — you follow what's happening in the space and like to experiment

Nice to Have
Experience with Playwright, Puppeteer, or any browser automation framework
Familiarity with anti-detect browsers or browser fingerprinting concepts
Prior experience working with LLM APIs (Claude, OpenAI, or similar)
Understanding of bot detection mechanisms and mitigation strategies
Experience with Redis / BullMQ or similar job queue systems
Docker, CI/CD, basic infra ownership

What We're Really Looking For
Technical skill matters, but it's not the whole picture. We're looking for someone who picks things up fast, takes ownership without being asked, and genuinely enjoys working at the intersection of AI and automation. You don't need to have done exactly this before — but you should be the kind of engineer who looks at a complex system and wants to understand how it works end to end.