Full Stack Engineer (React + Python, Node.js)

Senior

Bulgaria/Serbia

Hybrid

Wiser Technology is a leading software development company. Our team of 600 engineers across Europe excels in web and mobile software development, video streaming, defense, machine learning, automotive, e-commerce, and AI. We leverage top-tier technologies and expertise driven by a passion for innovation to drive progress.

Responsibilities:

Build premium, responsive UI in React (component architecture, state management, routing, accessibility)
Develop and maintain backend services in Python (FastAPI preferred) and TypeScript (Node.js services where appropriate).
Design clean APIs (REST/GraphQL as needed), integrate with Microsoft Graph (mail, calendar, files/SharePoint, Teams) and internal services.
Implement agent orchestration features: tool execution, job scheduling, run history, audit logs, permissions, and safety controls.
Build real-time experiences (websockets/streaming) for agent runs, logs, and progress updates.
Own data layer design: schemas, migrations, caching, and query performance.
Ensure production readiness: observability (logs/metrics/tracing), reliability, incident response, and postmortems.
Drive engineering quality: testing strategy, code reviews, CI/CD, documentation, and secure-by-default patterns.
Collaborate with product, security, and stakeholders; translate ambiguous requirements into shipped outcomes.

Required qualifications:

10+ years experience shipping production software as a full-stack engineer.
Strong React experience (hooks, performance, component composition, design systems).
Strong backend experience in Python and/or TypeScript; comfortable working across both.
API design and integration experience (auth, pagination, rate limits, retries, idempotency).
Solid understanding of security fundamentals (OAuth/OIDC, secrets management, least privilege, audit logging).
Experience with relational databases (PostgreSQL preferred) and/or document stores; migrations and query tuning.
Familiarity with modern dev tooling: Git, CI/CD, containerization (Docker), and cloud deployment patterns.
Excellent ownership and communication; able to operate independently in a fast-moving environment.

Preferred qualifications:

FastAPI, Pydantic, Celery/RQ, or async Python in production.
Node.js frameworks (NestJS/Express) and TypeScript at scale.
Experience with Microsoft 365 ecosystem: Microsoft Graph, SharePoint/OneDrive, Teams.
Real-time UI (websocket streaming, SSE) and log/trace visualization.
Kubernetes and platform operations experience.
Experience building developer platforms: SDKs, CLI tools, plugins/extensions.
Exposure to LLM/agent systems: tool calling, guardrails, prompt/versioning, evaluation frameworks.

Tech stack (typical):

Frontend: React, TypeScript, Tailwind (or equivalent), component library/design system
Backend: Python (FastAPI), TypeScript (Node.js)
Data: PostgreSQL (plus Redis if needed)
Infra: Docker, Kubernetes, CI/CD pipelines, observability stack

We understand that you may not tick all these boxes, but we are looking for enthusiasm and a willingness to learn.

WHAT’S IN IT FOR YOU?

Culture & Development:

Friendly Environment: We take pride in our culture and love spending time together.
Team Spirit: Be part of a supportive team that uplifts each other.
Mentorship and coaching: Our colleagues are experts in their field, and you can expect to have a solid team to rely on.
Personalized Development Program: We realize that one size doesn’t fit all, so you'll receive an individual development plan tailored to your career aspirations.

Social Benefits:

Work Flexibility: Embrace flexible working hours and choose from remote, hybrid, or onsite work models. Multiple Office Locations: In Sofia, Plovdiv, Stara Zagora, and Nis, you can choose where you would like to work.
A Suite of Perks: Enjoy food vouchers, additional health insurance, sports cards, and more.
Community and Connections: Engage in exciting social events and team initiatives.

Ready to advance your career with a tech leader passionately driven by innovation?

Wiser, We Have The Code®