Systems Architect and Full-stack Engineer

* This is an architecture role that writes code, not a coding role that occasionally diagrams.

* The hard problems here are not framework problems. There are questions like:

* What is the right abstraction for behavior that must stay identical across brands with wildly different experiences?

* Where does a system have to be deterministic and reproducible, and where can human judgment live?

* What belongs in a shared contract versus a local implementation?

* How do you make a system's invariants checkable rather than aspirational?

* We need someone who thinks in systems and concepts first, and who can then build the thing. Specifically:

System architecture and concept design

* Define service boundaries, data models, and contracts between components

* Design seams that let the same code run locally and hosted without a rewrite

* Turn fuzzy capabilities into clear models of core entities and rules

* Apply MIT concept design methodologies to agentic system design

* Design abstractions that keep behavior consistent across brands with very different experiences

* Decide where systems must be deterministic and where human judgment can apply

* Make architecture decisions alongside founders with product and engineering backgrounds

Verification and documentation

* Plan up front how each system will prove its correctness, rather than retrofitting tests

* Make system invariants checkable through code and tests

* Write specifications, decision records, and product invariants in RFC 2119 language

Agent-driven development

* Direct AI agents to build features and review their output in depth before merging

* Write specs that agents can execute and reviewers can check

* Maintain agent instructions and skills as first-class artifacts

* Run independent adversarial reviews before opening pull requests

* Catch plausible but wrong results (e.g. silent safety gates, empty version pins, hollow dependency directories)

* 8+ years of software development experience

* Proficiency with TypeScript

* Proficiency with Python

* Experience directing AI coding agents with rigorous review and verification practices

* Experience building component-driven front-ends and data-heavy internal consoles

* Experience with Postgres, including migrations, indexing, and query performance diagnosis

* Experience with containers and production deployments

* Experience with monorepos and multi-repos (e.g., workspaces, shared packages, versioned internal contracts)

* Experience building CI/CD pipelines (e.g., merge gates, reproducible builds, release and rollback, environment parity)

* Experience owning system architecture decisions in production

* Experience implementing protocols against specifications and building the conformance tests

* Experience with messaging APIs (e.g., carrier, WhatsApp, chat)

* Experience in instrumenting systems and reading traces for observability

* Ability to become productive with unfamiliar frameworks within a day

* Ability to hand-code and deeply review AI-generated code

* Deep understanding of typed schemas as a single source of truth, generated clients, and centralized validation

* Deep understanding of UX quality for pixel-perfect feature execution

* Interest in cutting-edge technologies and proposing new ideas for internal tools

* Strong communication skills in both spoken and written English

* Startup experience

* Experience with business messaging platforms in production (e.g., Apple Messages for Business, RCS Business Messaging, WhatsApp Cloud API)

* Experience with Rust, Swift

* Experience with iOS or Android device automation, or computer vision applied to testing

* Experience designing certification, audit, or compliance systems

* Bachelor’s Degree in Computer Engineering, Computer Science, or equivalent

Hiring from: Argentina, Brazil, Colombia, Mexico, Paraguay, Chile, Peru, Costa Rica, Uruguay.