Accepting new freelance contracts

MirwanAkayguen.

Freelance Software Developer · Backend, Frontend & API integration

Nearly ten years in software, fully freelance since 2019. I design, build and ship production backend and frontend systems in Java, Spring, Python, Angular and React Native, end to end.

JavaSpringPythonOracleAngularReact NativeAI / LLM

Email me a brief

View selected work↓

Munich, DE

Remote / Hybrid

From 85 EUR/h

DE · EN

~/profile.json

{
  "name": "Mirwan Akayguen",
  "role": "Software Developer",
  "based": "Munich, Germany",
  "experience": 10,
  "stack": [
    "Java", "Spring", "Python",
    "Oracle", "PostgreSQL", "Angular",
    "React Native", "AI / LLM"
  ],
  "rate": "85 EUR/h",
  "available": true
}

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JavaSpring FrameworkPythonOraclePL/SQLPostgreSQLMySQLREST APIsOAuth 2.0WebhooksAngularReactReact NativeTypeScriptNode.jsGitGitLab CIJenkinsLinuxETL PipelinesLLM / RAGn8nMakeVision APIs

// approach

Fromasingleemailtosoftwarerunninginproduction.Architecture,code,tests,deploymentandthe24/7monitoring,ownedbyoneengineerendtoend.

// 01

Stack & Expertise

Six core areas across full-stack development, databases, DevOps and AI integration.

Backend & APIs

Java · Spring Framework · Python · REST API Design · OAuth 2.0 · Webhook Architectures · Async Pipelines

Databases

Oracle · PL/SQL · MySQL · PostgreSQL · SQLite · Stored Procedures · Triggers · Index Tuning · ETL

Frontend

Angular · React · React Native (Expo) · TypeScript · JavaScript ES6+ · HTML5 · CSS3 · SASS · Bootstrap

DevOps & Tools

Git · GitLab CI · Jenkins · IntelliJ IDEA · Oracle SQL Developer · Linux · Cron · Logging · Monitoring

AI & Automation

LLM Integration (OpenAI, Anthropic, Qwen) · Prompt Engineering · n8n · Make · AI Image Generation · Vision APIs

Quality

JUnit · Jasmine · Karma · Unit & Integration Testing · Code Reviews · Scrum · Kanban

// 02

Selected Work

Production engagements covering backend, frontend, AI integration and mobile.

Multi-Marketplace Backend & API Integration

Production Python backend coordinating multiple e-commerce platform accounts via REST and SOAP APIs (eBay, Amazon SP-API, Shopify Admin API, Pinterest, Meta). OAuth2 token lifecycle, rate limiting, retry strategies, structured logging in 24/7 operation.

PythonREST APIsOAuth 2.0PostgreSQL

$ python orchestrate.py

✓ OAuth refresh ok

✓ Rate limiter armed

Running batch...

✓ All sessions healthy

→ Scheduled next run

Oracle PL/SQL & Java Spring Backend

Backend engineering for Oracle databases: PL/SQL programs, stored procedures, triggers, performance tuning of high-traffic tables. Java + Spring REST APIs integrating internal backend systems with third-party services. Legacy migration with backwards compatibility and zero-downtime delivery.

JavaSpringOraclePL/SQL

$ python etl.py

✓ Source ingested

✓ Schema validated

Transforming...

✓ Published

→ 0 validation errors

Angular Frontend & API Integration

Scalable Angular single-page applications with modular component architecture and RxJS reactive state. REST API integration for dynamic data visualisation and real-time updates. Performance tuning via lazy loading, OnPush change detection, bundle splitting. WCAG-accessible design.

AngularTypeScriptRxJSREST APIs

$ pytest -x --parallel

tests/unit ........... ok

tests/integration .... ok

tests/e2e ............ ok

✓ All passed

→ Coverage report ready

AI Workflow & Mobile Cross-Platform

AI-powered content generation system using OpenAI, Anthropic, Qwen with prompt engineering and vision APIs. Cross-platform mobile app (React Native, Expo, TypeScript) with offline-first architecture, multilingual localisation and Skia data visualisation, live in market.

LLMsReact NativeTypeScriptSkia

$ python rag_query.py

✓ Embeddings loaded

Routing to provider...

✓ Structured output

✓ Validation passed

→ Response ready

// 03

Track Record

End-to-End

Architecture, implementation, deployment and 24/7 operation in one hand

Async-First

Requirements via email or ticket, code shipped via PR. No calls or standups required

Full-Stack

Backend (Java, Spring, Python) and frontend (Angular, React, React Native) in one engagement

Database-Strong

Oracle, PL/SQL, PostgreSQL with proper modelling, indexing and performance tuning

AI-Native

LLM integration in production: OpenAI, Anthropic, Qwen with prompt engineering

Production-Grade

Tests, structured logging, monitoring, OAuth lifecycle, retry strategies

// 04

How I Work

Async-first delivery model: scope by email, code via PR, no calls required.

Scope

You email the requirements. I review and ask clarifying questions within 24 hours.

Estimate

I send a written estimate with timeline, approach, and hourly breakdown. No call needed.

Build

Weekly deliverables via Git. You review PRs, I iterate. Structured async updates.

Ship

Production-ready code, documented, tested. Clean handoff with zero dependencies on me.

// 05

About

In software since 2016 (vocational training in application development at CREALOGIX, Puchheim, school grade 1.8). Continuously freelance since 2019. Backend, frontend and integration work for clients across DACH and the US.

Fully async workflow: you send requirements via email or ticket, I deliver production-ready code with clean git history. Owner of Umbolement LLC for international engagements.

In software

Freelance

DACH.

Markets

EN/DE.

Languages

// 06

Good fit if you need

You need a backend developer for Java, Spring, Oracle/PL-SQL or Python pipelines

You need Angular, React or React Native frontend built and shipped reliably

You want REST API design, OAuth integration or third-party platform connectors

You need AI / LLM integration into existing business workflows

// 07

Common questions

The seven questions that usually come up before a brief lands.

Within 24 hours on business days. You send the scope in writing, I reply with clarifying questions, a written estimate and a proposed timeline. No discovery call required.

Hourly at 85 EUR/h is the default for ongoing work. Day rate 680 EUR for full-day blocks. Fixed price for clearly scoped deliverables. Invoices monthly with net 14 terms.

Yes. NDAs, MSAs and SOWs are routine. For DACH clients I invoice as a registered German Selbstständiger; for international engagements via Umbolement LLC (New Mexico, USA).

Remote-first. Occasional on-site days in Munich and the wider DACH region are possible by arrangement. Time zone overlap with EU and US East Coast works without friction.

Your repository, your pipelines. Weekly PRs with reviewable diffs, structured commit history, written architecture notes. Production-ready code, documented, tested. Zero dependency on me after handover.

From single 10-hour fixes to multi-month builds. No retainer minimum. If the brief is outside my stack, I say so up front instead of stretching.

German (native, C2) or English (professional working proficiency, C1). Documentation and code review in either, your preference.

// 08

Have a project in mind?
Let's build it.

Send me the scope via email. I respond within 24 hours with an estimate and approach. No calls required.

From 85 EUR/hDay rate 680 EURRemote, Munich, DACH

info@akayguen.dev Lebenslauf Resume