Middle Back-end Developer

About Altum
Altum Software builds AI-driven infrastructure that automates sales and business operations. Our internal systems replace manual workflows with autonomous agents — covering everything from lead qualification to end-to-end customer communication. We're a small, senior team focused on shipping things that hold up in production. Minimal process, no unnecessary meetings — just hard problems and full ownership of what you build.

The Role
We're hiring a Backend Developer to help build the infrastructure behind our AI automation platform. You'll take ownership of the server-side systems running at scale — handling concurrent sessions, coordinating background processing, wiring LLMs into production workflows, and keeping everything resilient under load.
This is a hands-on role with genuine architectural input. You'll work closely with the founders and have direct visibility into how the product evolves.

What You'll Build
AI SDR agents that run outreach, qualify leads, and progress them through the pipeline autonomously
Browser automation layers letting agents interact with web platforms — session handling, action execution, anti-detection logic at scale
LLM integrations (Claude API) powering message classification, context-aware replies, and simultaneous conversation management across hundreds of threads
A job orchestration layer — queues, workers, concurrency control — that keeps the whole system reliable
Core data models and internal APIs that other services depend on
Integrations with CRMs, calendar tools, messaging platforms, and alerting systems
Internal agents that handle repetitive customer-facing tasks and escalate to humans only when necessary

What We're Looking For
2+ years of commercial backend development experience
Solid grasp of system design fundamentals — queues, background jobs, concurrency, failure recovery
Strong hands-on experience with relational databases (PostgreSQL or similar), including schema design and query optimization
Track record shipping and maintaining production APIs/services
Ability to quickly integrate third-party APIs, even with sparse documentation
Structured, systems-level thinking — you understand how the pieces fit together
Real interest in AI tooling and a habit of experimenting with what's new

Nice to Have
Playwright, Puppeteer, or similar browser automation experience
Knowledge of anti-detect browsers or fingerprinting techniques
Hands-on work with LLM APIs (Claude, OpenAI, etc.)
Understanding of bot detection and evasion strategies
Redis / BullMQ or similar queueing systems
Docker, CI/CD, some infrastructure ownership

What Matters Most
Skills aside, we want someone who ramps up quickly, takes initiative without waiting to be asked, and actually enjoys working where AI meets automation. Exact prior experience isn't required — but you should be the type who wants to fully understand a complex system, not just the part you're assigned.