Kozak Agency

Full- Stack developer (PHP+Angular) for Workplace Management Platform  with focus on backend side.

Seniority level: middle +/senior
Start: asap
Duration: ~12 months
English: B2

We are looking for an experienced Full Stack Engineer (Angular 25% + PHP 75%) to join our team for a long-term project focused on developing a cutting-edge workplace management platform. This platform helps people book desks, meeting rooms, schedule meetings, coordinate teams, and manage visitors and aims to boost productivity, streamline operations, and foster collaboration across all workspaces. The ideal candidate will have a strong background in both Angular and PHP, with a passion for building innovative solutions.
 

RESPONSIBILITIES:
- Build highly performant, scalable PHP-based SaaS applications.
- Craft beautiful frontend applications using Angular 20 and Typescript.
- Develop solutions to deliver new innovative products for web and mobile platforms using the project RESTful APIs running in AWS.
- Work closely with the wider engineering team (full-stack, backend), designers, and product.
- Be included in decisions and challenge our technical direction.
- Design and develop code with performance, usability, maintainability, and security in mind.
- Resolve technical issues through debugging, research, and investigation.
- Write and maintain automated tests to ensure we deliver quality work for our customers.
- Create and maintain internal technical documentation for deliverables.
 

SKILLS AND EXPERIENCE: 
- 5+ years relevant experience in a software engineering role.
- Experience building large-scale consumer web/mobile applications and distributed systems.
- Knowledge of PHP + Symfony framework. 
- Knowledge of TypeScript (Angular) to create interactive user interfaces.
- Up to date with the latest frontend libraries, frameworks, and practices.
- Passionate about writing clean code.
- You must be a quick learner and be flexible about what technologies you use. 
- Good understanding of MVC and SOLID principles.
- Experience with multi-tenancy would be a plus.
- Experience in implementing web services with a REST and Web API architecture
- You must be comfortable with rapid development in a Scrum / Agile environment and iterating based on market and customer feedback.
- Knowledge of Unit testing
- English level: upper-intermediate and higher
- Excellent collaborator and communicator within your team and the wider company.
- BSc in a related field such as Computer Science, Computer Engineering, or other software/design discipline.

Experience
7+ years of backend engineering experience

About the Role
We’re a rapidly growing startup building data- and AI-driven systems at scale. We’re looking for a Senior Backend Engineer who thrives on ownership — someone who designs systems, ships them to production, and takes responsibility for their reliability, performance, and long-term quality.
You’ll own core backend services and data pipelines that handle high-volume structured and unstructured data, power AI workflows, and serve LLMs in production. This is a hands-on role with real impact and minimal process overhead.

What You’ll Do
• Own and build core backend services with modularity using Python and FastAPI
• Design and maintain production-grade APIs for data ingestion, processing, and model inference • Build systems that handle high-volume structured and unstructured data (text, documents, embeddings, events)
 • Design and operate AI data pipelines that support ingestion, transformation, and serving
 • Support hosting, scaling, and serving LLMs and other ML models in production
 • Design and optimize PostgreSQL schemas and queries for performance and reliability
 • Build asynchronous and event-driven systems using RabbitMQ
 • Make pragmatic architecture decisions with a focus on simplicity, correctness, and scalability
 • Ensure systems are observable, fault-tolerant, and easy to operate
 • Take responsibility for production issues, debugging, and continuous improvement
 • Set a high bar for code quality, testing, and maintainability
 • Collaborate closely with product, frontend, and ML teams

What We’re Looking For
Core Backend & Systems
• 7+ years of backend engineering experience
• Strong proficiency in Python, including async programming
• Extensive experience with FastAPI or similar modern frameworks
• Strong fundamentals in API design, authentication, and security
• Deep experience with PostgreSQL (schema design, indexing, query optimization, migrations, concurrency)
• Hands-on experience with RabbitMQ or similar systems (queue design, retries, backpressure, failure handling)

Preferred Data & AI Experience
• Experience handling large-scale structured and unstructured data
• Experience building or supporting AI/ML data pipelines
• Exposure to LLM inference systems (self-hosted or managed)
• Ability to design backend systems that evolve as models and data change

Deployment & Reliability
• Strong experience with Docker and containerized deployments • Familiarity with CI/CD and automated releases
• Strong focus on reliability, observability, and operational quality

Nice to Have
• Kubernetes or container orchestration experience
• Experience running compute-intensive or GPU-backed services • Experience with vector databases or search systems

We don't need coders, we need engineers who build features end-to-end using Claude Code. Without any "hand-coding".

Details: 
 • AI coding experience (mandatory!): experience with Claude Code - #1 priority, or other agentic coding tools. Claude Code is what is used on the project 
• Senior Full-Stack Engineer (SvelteKit Frontend, Golang Backend), 5+ years of experience, can potentially consider really strong candidates with 4 years of experience 
• Strong proficiency in English (Upper-intermediate level or Advanced)
 • Full-time
 • Fully remote
 • Start: ASAP!

Sharing more details about the responsibilities and requirements below.

What you'll actually do:
 • Own features end-to-end: from specs to deployment to fixing bugs
 • Use Claude Code to generate SvelteKit frontend and Golang backend code
 • Review AI output for quality and architectural fit
 • Fix bugs to learn our codebase, then rapidly build new features
 • Make quick decisions on what to build vs buy vs generate with AI
 • Talk to customers when they report issues and ship fixes same day

Our stack:
 • Frontend: SvelteKit, turbo monorepo, Vercel
 • Backend: Golang monorepo
 • AI: Claude Code (mandatory), other agentic coding tools

Products you will build:
 • API: platform features, tooling, multi-agent system, etc.
 • UIs: internal UIs, B2B dashboards, B2C web appsYou must have:
 • Ownership mentality with a strive for elegantly simple, high-quality solutions
 • Strive for max quality - you test your own work thoroughly since we have no QA team, everything you ship MUST work
 • Product mindset - you care about WHY we're building something
 • Proven experience using Claude Code or similar agentic AI (Cursor, Windsurf) 
 • Strong SvelteKit and Golang experience - you'll review AI's code in these, and you must understand how it works
 • Broad architectural knowledge of building modern full-stack applications
 • Excellent spoken English and a good internet connection for daily video calls

You are a great fit if you:
 • Get frustrated when development takes weeks instead of days
 • You think in features and architecture and not single lines of code
 • Can spot subtle bugs in AI-generated code quickly
 • You ship fast but always verify it actually works
 • Have shipped real products that customers actually use
 • Think "how can AI build this?" as your first instinct

Red flags (don't apply if):
 • You've never used Claude Code or similar AI coding tools
 • You're a perfectionist who loves to code
 • You need detailed specs before starting
 • You see AI as a threat rather than leverage
 • You're outside European/African timezones

Requirements:
• Webflow (system-level, production, CRO pages) — 5+ years
• Large-scale Webflow websites, reusable components, CMS, rapid iteration without system disruption, working in a high-velocity marketing environment.
• Conversion Rate Optimization (CRO, A/B testing, experimentation mindset) — 2+ years
• Practical experience in conversion rate improvement: hypotheses, landing pages, tests, iterations, understanding metrics and the impact of changes.
• Front-end fundamentals (HTML/CSS + basic JS for experiments) — any
• Responsive layout, flex/grid, stable markup, JS for DOM manipulation, integrations, and experimental scenarios.