10/03/2026 updated

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100 % available

Senior Software Developer - AI Agents, Python/FastAPI, .NET, Java, Delphi

Temerin, Serbia
Only remote
Bachelor of Computer Science, Department of Informatics, Faculty of Sciences Novi Sad (1994-2003)
Temerin, Serbia
Only remote
Bachelor of Computer Science, Department of Informatics, Faculty of Sciences Novi Sad (1994-2003)

Profile attachments

CV_Almos_Gero_eng_2026.docx

IoTOpenAIChatGPTLangChainJava (Programming Language)JavaScript.NET FrameworkArtificial IntelligenceAndroid (Software)Apache TomcatDelphi (Programming Language)C Sharp (Programming Language)IBM DB2LinuxJava Platform Enterprise Edition (J2EE)Enterprise Resource PlanningEntity FrameworkHibernateIBM Websphere Application ServerInternet Information Services (IIS)Python (Programming Language)Lightweight Directory Access Protocols (LDAP)Machine LearningWindows Presentation FoundationMicrosoft SQL ServersVisual Basic .NET (Programming Language)Windows ServersMongoDBMySQLMessage Queuing Telemetry Transport (MQTT)NGINXOAuthNext.jsSQL DatabasesTypeScriptWindows FormsInformixDevexpressInterBaseWcf RestReact.jsOracle 10g/11gLarge Language ModelsPrompt EngineeringSpring BootGitFastAPIStripeReact NativeRestful ApiDocker
AI Agents & LLM Integration
Expertise in LangGraph, LangChain, AI agents and tool calling, multi-agent orchestration, prompt engineering, Ollama and local LLMs, Claude and OpenAI APIs, as well as LLM reliability techniques such as retries and fallbacks.

Python & FastAPI Backend Development
Extensive experience designing and building Python/FastAPI backends with MongoDB, including SSE streaming, REST APIs, and integration with AI agent platforms and workflow engines.

.NET & C# Application Development
Long-running development and maintenance of business software in C#/.NET using DevExpress, WCF, Entity Framework, WinForms, WPF, and XtraReports for enterprise and ERP applications.

Delphi & InterBase/Firebird Development
Development and long-term maintenance of business and accounting software using Delphi with InterBase and Firebird databases.

Frontend & Mobile Development
Experience with React, Next.js, Vite, Tailwind CSS, HTML/CSS, React Native with Expo, and Android development in Java.

Database Management
Broad experience with MongoDB, Microsoft SQL Server, Firebird, InterBase, Oracle, DB2, MySQL, and Informix across various enterprise and business applications.

Infrastructure & DevOps
Linux administration including Nginx, Docker, PM2, systemd, Windows Server, IIS with URL Rewrite and reverse proxy, Certbot/SSL and DNS automation, MikroTik and Eltex networking.

Integrations & IoT
Experience with MQTT, RTLS (AeroScout), nurse call systems, BAS, access control (CCure 9000), Stripe, LDAP, OAuth2/Google Auth, IMAP/SMTP, and SOAP integrations.

Java & Enterprise Application Development
Development of large-scale ERP applications using IBM WebSphere, EJB, Spring, Hibernate, JasperReports, and REST APIs on OS400 and standard platforms.

Tools & Development Environments
Proficient with Visual Studio, VS Code, Git, Eclipse, NetBeans, IBM WebSphere Studio, Rational Rose, XML Spy, and Erwin.

Experience

Professional experience10+ years
Freelancer since2026

Languages

EnglishFluentHungarianNative speakerSerbianNative speaker

Project history

Author / Independent Developer

CoopDiver (own project)
Business software for agricultural cooperatives that take over crops from farmers for money (crop intake, farmer accounts, settlements and payments, reports). Technology: C#, .NET, Entity Framework, WinForms, DevExpress (XtraForms, XtraReports, GridControl), WCF services, Firebird. Development and long-term maintenance including architecture, data model, business logic, and reports.

Architect & Lead Developer

idorchestrator (own project)
Middleware/proxy platform between frontends and backends with AI agent orchestration and workflow automation; base platform for several client workspaces. Built using Python, FastAPI, LangGraph, MongoDB, React, Ollama, Claude API, SSE streaming, Windows Server/IIS, Linux. Designed and built the whole platform including LangGraph ReAct supervisor orchestrating a coder agent and workflow engine, self-development agent, dynamic workflow engine with JSON definitions, prompt-engineering pipelines, i18n system, and deployment automation.

Lead Developer

WPHC (own project)
Healthcare/hospital facility management system built on the idorchestrator platform. Technology: Python, FastAPI, MongoDB, LangGraph workflow engine, MQTT, AeroScout RTLS, React. Workflows for nurse call escalation, RTLS, security, fire alarm and building automation; RTLS log data analysis; integrations with nurse call, access control and building systems.

Author / Independent Developer

Accounting software (own project)
Accounting software package for companies. Technology: Delphi, InterBase/Firebird. Development and long-term maintenance.

Author

Own products: MailDiver, FreelanceDiver, InvestDiver, MyXTB, PECRON webshop
MailDiver - self-hosted multi-user webmail client (IMAP/SMTP, local AI features); FreelanceDiver - AI that finds and scores the best projects on Upwork and freelancermap; InvestDiver and MyXTB - AI investment agents with human approval per trade (Alpaca, IBKR, XTB); PECRON - e-commerce webshop with cart, orders and payments. Technology: Python, FastAPI, MongoDB, React, Tailwind CSS, Vite, Ollama, Claude API, OAuth2, IIS URL Rewrite reverse proxy.

Independent Developer

CardDiver / rs.kartica.app (own project)
Loyalty card wallet app for Serbian retail chains, web and mobile, published on Google Play. Technology: Turborepo monorepo, Next.js, Expo/React Native (New Architecture), TypeScript, Android (Java, ksoap2/SOAP), Meta Ads SDK.

Independent Developer

MIS4 (ERP project)
ERP application intended for large enterprises. Technology: IBM WebSphere studio application developer 5.1.2, IBM WebSphere application server 6.0, DB2 8.2, 9.5 database, OS400. Used: EJB CMP entity, stateful and stateless beans, CVS, Ant, Velocity, PMD validation, Beryl XMLGUIBuilder, JasperReports, Log4J. Later moved to Spring, Hibernate, REST communication, DB2, Oracle and MySQL. Worked on application development, architecture, model and implementation, entity beans, servers and client logic, persistence, deployment, refactoring, optimization, and consultant role.

Chief Developer

UPR.NET (own project)
System for the management of investment funds. Technology: Visual Studio 2010, WPF, Web Services, EntityFramework 4 with POCO classes, WPF user interface, DeveloperExpress controls for VS2010. Worked on application development and architecture.

Chief Developer

UPR (own project)
System for the management of investment funds. Technology: Microsoft Visual Basic 6, Microsoft SQLServer 2005, MTS or COM+, ADO 2.6. Multilayer system (4-tier), where windows and internet clients use the same components from business layer. Business layer is stateless COM+ (or MTS). Worked on application development and architecture.

Independent Developer

MIS4 (ERP project)
ERP application intended for large enterprises. Technology: IBM WebSphere studio application developer 5.1.2, IBM WebSphere application server 6.0, DB2 8.2, 9.5 database, OS400. Used: EJB CMP entity, stateful and stateless beans, CVS, Ant, Velocity, PMD validation, Beryl XMLGUIBuilder, JasperReports, Log4J. Worked on application development, architecture, model and implementation, entity beans, servers and client logic, persistence, deployment, refactoring, optimization, and consultant role.

Junior Developer

Pension Fund Management
Integrated software package for processing and administration of Pension Fund. Technology: Microsoft Visual Basic 6, ADO, Oracle.

Junior Developer

Petefi AD
Accounting software package for Petefi AD Temerin. Worked on package development. Technology: Clipper, FoxPro 2.

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