Principal Product Engineer

We are seeking a Principal Backend Engineer to lead the technical evolution of Diesta’s backend platform. This is a deeply technical role for someone who can make difficult architectural decisions, set a high engineering bar and help the team scale a complex, data-intensive system with confidence.

You will own technical direction across our NestJS, Node.js, Type Script and AWS backend: designing well-typed APIs, clear service and data boundaries, robust processing workflows and platform capabilities that can handle millions of records and events without compromising correctness, observability or operability.

A key part of the role is separating the data layer from the application layer. You will help ensure an action taken in the Portal has an explicit, reversible application-level meaning, while durable downstream processing and propagation are modelled independently, safely and transparently.

This role is not primarily about product discovery or customer-problem framing, although product understanding is a strong advantage. Your main focus is technical excellence: making the system more scalable, reliable, comprehensible and easier for the engineering team to evolve.

As Diesta moves from an AI-driven SDLC towards a more agentic one, you will use AI-assisted tools to increase technical leverage, improve engineering workflows and raise the quality of design, code review, testing and documentation - always with rigorous human judgement.

Technical Direction
:
Lead the backend technical effort, establish architectural direction, and guide the team through complex design choices, refactoring priorities and engineering trade-offs.

NestJS Architecture
:
Design and evolve a clean, modular NestJS architecture with clear module boundaries, dependency management, testability and maintainable conventions.

Typed APIs and Contracts
:
Design well-typed, version-aware APIs and integration contracts that are clear to consumers, resilient to change and straightforward to test and observe.

Scalable Data Architecture
:
Design data and processing patterns for high-volume workloads, including millions of records or events, with attention to performance, consistency, resilience and operational cost.

Layering and Boundaries
:
Maintain a clear separation between the data layer, domain/application logic and delivery layer so that system behaviour remains comprehensible and change is controlled.

Reversibility and Propagation
:
Model Portal actions, state transitions, undo paths and downstream propagation separately, ensuring that customer-facing actions can be reversed safely without creating hidden inconsistency underneath.

Reliability Engineering
:
Improve idempotency, retry behaviour, failure isolation, observability, alerting and recovery across critical workflows and integrations.

Technical Leadership
:
Lead design reviews, mentor through code review and pairing, make technical standards explicit, and help engineers grow their ability to work effectively in a complex system.

System Improvement
:
Identify and drive pragmatic improvements to scalability, maintainability, security and operational robustness, working with the existing team that built and knows the platform.

AI-Assisted Engineering
:
Use AI tools and agentic workflows to accelerate codebase analysis, implementation planning, testing, documentation and technical investigations, while improving the repeatability of engineering work.

Collaboration
:
Work closely with backend and frontend engineers, QA, Dev Ops, data engineers and engineering leadership to turn technical direction into durable delivery.

Documentation
:
Produce clear architectural decision records, API and data-contract documentation, and operational guidance that humans and AI agents can use safely.

Principal-Level Backend Experience
:
Substantial experience designing and evolving production backend platforms, with a track record of technical leadership in complex, high-scale systems.

NestJS and Type Script Depth
:
Deep practical knowledge of NestJS, Node.js and Type Script, including modular architecture, dependency injection, validation, testing and production operations.

Infr…