Senior Fullstack Developer

Job not on LinkedIn

🕒 Yesterday

🇪🇸 Spain – Remote

⏰ Full Time

🟠 Senior

🧑‍💻 Full-stack Engineer

👻 Ghost score 12%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Cognativ Inc

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2016

🤝 B2B

💼 Consulting

🤖 Artificial Intelligence

B2B • Consulting • Artificial Intelligence

Cognativ Inc. is a global technology services and engineering partner that helps private equity firms, growth companies, and startups scale and execute enterprise-grade product and infrastructure work. They offer full‑stack engineering, data & analytics foundations, ML/AI product integration, post‑acquisition tech consolidation, governance‑ready architectures, and capital‑efficient team scaling. Cognativ positions itself as an experienced B2B technology consultancy providing MVP and AI‑native development, engineering leadership augmentation, and scalable operations across multi-entity portfolios, with offices in the USA, Spain, Serbia, India and LATAM.

📋 Description

• Design and build business logic and domain modules in an ASP.NET Core API following Clean Architecture principles. • Build and maintain asynchronous background processing services for document-heavy workflows, coordinated through message queues. • Develop and maintain multiple Next.js/React applications for internal operations and external/customer-facing portals, sharing a common package layer. • Design relational data models and write efficient data access code using EF Core and PostgreSQL. • Integrate with cloud-native infrastructure including message queues, blob storage, secrets management, and managed identity providers. • Implement authentication and authorization across workforce and external/customer identity boundaries. • Collaborate on API contracts and shared TypeScript types consumed by front-end applications. • Participate in architectural decisions that keep the modular monolith maintainable and well-tested. • Build human-in-the-loop tooling for reviewing, correcting, and approving AI-assisted extraction results with full traceability. • Write and maintain automated tests across the stack and participate in CI/CD pipeline health. • Participate in code reviews and technical design discussions, and mentor less experienced engineers.

🎯 Requirements

• 8+ years of professional software development experience, with deep expertise in C# / .NET (ASP.NET Core). • 4+ years building production front-end applications with React, including Next.js (App Router, server components/actions, route handlers). • Strong understanding of Clean/Layered Architecture, domain modeling, and separation of concerns in non-trivial back-end systems. • Experience with relational databases and ORMs (EF Core or equivalent), including migrations and query performance. • Solid TypeScript skills and comfort working in a monorepo with shared, versioned internal packages. • Experience with cloud infrastructure (Azure preferred; AWS/GCP equivalents considered), including messaging/queues, object storage, and secrets management. • Experience implementing or integrating OAuth2/OIDC-based authentication, ideally with enterprise identity providers such as Microsoft Entra ID or similar. • Strong automated testing discipline: unit, integration, and contract testing on both back end and front end. • Comfortable working across the full stack without hand-offs, from database schema to API to UI. • Excellent communication skills and experience working in a small, senior, high-autonomy engineering team.