SQL Experts in Dortmund
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Meet FRATCH Experts in Dortmund, who have recently used SQL
Nemanja Milenković
Last position:
AI Engineer / Senior Backend Engineer at Intelycx
Manufacturing intelligence platform with enterprise workflows, RAG, real-time AI assistant features, and multi-repository backend architecture.
- Built and extended production AI/backend services with Django, DRF, FastAPI, GraphQL, Celery, PostgreSQL, MySQL, Redis, and WebSockets across a modular multi-repository platform.
- Contributed to ARIS V2, a real-time manufacturing AI assistant using LangChain, LangGraph, MCP tool orchestration, planning/execution flows, OpenAI, AWS Bedrock, Qdrant, and Elasticsearch/OpenSearch-backed retrieval.
- Supported rollout expansion from ARIS V1 in 4 of 17 client production plants to ARIS V2 currently active in 13 of 17 plants, increasing real-world deployment coverage to more than 50% of the client footprint.
- Worked on document-grounded RAG functionality including ingestion, OCR, chunking, embeddings, indexing, retrieval, reranking, and grounded answer generation for industrial workflows.
Stack: Python, Django, DRF, FastAPI, LangChain, LangGraph, GraphQL, Celery, WebSockets, OpenAI, AWS Bedrock, Qdrant, Elasticsearch/OpenSearch, PostgreSQL, MySQL, Redis, Docker.
Manuel Kübler
Last position:
.NET Developer, SAP Business One Consultant at Own Projects
- DTO class generator: In-house development of a tool for the automatic generation of classes, functions, and methods for use in .NET Core projects based on SAP Business One Service Layer metadata
- E-invoice import add-on: Development of a SAP Business One add-on / coresuite module for the automated import of ZUGFeRD e-invoices as incoming invoices – with configurable mapping to flexibly control the import logic across four mapping types (DIRECT, SQL, FIXED, EXPR). The add-on is available as a licensed product for SAP Business One customers.
Stack: SAP Business One, SAP Business One Service Layer, coresuite Country Package, C#
Diego Espinoza
Last position:
RPG Software Developer from RPG III to Free Format
- Development of software and system support for RPG development.
- Development, optimization and maintenance of programs in RPG (RPG II to ILE Free Format).
- Performing integration tasks, data management as well as applying and managing system updates.
- User support and training to ensure smooth system operation.
Jens Schneeweiß
Last position:
Network Technology at ISP, Internet Service Provider, BGP Peering
- Optimization of the transmission media of the data links in the Ruhr area
- Configuration/expansion of switches and routers for an autonomous system AS
- Improve the network protocols used Layer 2/3 (OSI model), RSTP, broadcast, etc.
- Laying cables, crimping, antennas, routers, switches
- Maintenance, expansion, selection and prioritization of troubleshooting measures for network monitoring (PRTG, The Dude)
- Organization and new connection of another BGP peering, data center, NGN fiber optic
- VPN IPSec site connections for 6 sites with PFSense, Fritzbox
- Configuration of WLAN devices (Mikrotik, UBNT
Label: TCP/IP, VLAN, BGP, OSPF, MPLS, VPLS, routing protocols, WLAN, EoIP, PPPoE, routing, SNMP, DHCP, DNS, NAT, native IP, VLAN, Ethernet, VoIP., switches and routers from: Nortel, Cisco, MikroTik, UBNT., network management systems: The Dude, PRTG, UISP
Volker Döch
Last position:
Developer at DV-Consulting und Entwicklung Volker Döch
- New development of a web app to manage and configure counting devices for large events
- Technologies: .NET 10, C#, Blazor, MudBlazor, MySQL, Git
Adnan Urwani
Last position:
Independent AI & Automation Projects
- Development of an automated job-scouting workflow for the aggregation and LLM-based evaluation of job postings from RSS feeds and APIs.
- Development of a Telegram bot for voice and text messages, featuring LLM-supported processing, summarization, and structured JSON output.
- Implementation of a personal task-planning assistant using n8n, OpenRouter, and Supabase for automated daily and knowledge organization.
- Development of LLM chatbots for structured knowledge retrieval utilizing prompt constraints, guardrails, and forced output formats.
Christian Albersmeier
Last position:
Partner at S&P Mergers and Acquisitions GmbH
- Strategic advisory for entrepreneurs and investors
- Preparation of information memoranda and term sheets
- Leading contract negotiations
- Assembling transaction teams
- Overseeing the due diligence process
- Supporting post-merger integration
- Conducting market analyses and company valuations
Rainer Pack
Last position:
Senior Controller at Stahlhandel-Servicecenter Bönen
- Controlling project work: implementation of customer quotation calculation and development of a trading and forward calculation for sales
- Development of a cost of goods manufactured calculator
- Theoretical design and practical implementation: temporary Excel-based solution introduced quickly; embedding into INFOR LN and creation of the requirements specification
- Majority of project management using modern tools (Loop, Jira, Excel, PowerPoint)
- Regular reporting on quotes submitted (contribution margin 1 and full cost coverage) and comparison with post-calculation
Dany-Armand Djeudeu-Deudjui
Last position:
Senior Data Scientist at ibg NDT GmbH
- Investigate the relationship between Eddy Current Testing (ECT) signals and microstructural properties
- Detect latent patterns in ECT data that reflect intrinsic material characteristics
- Develop and validate predictive models for microstructural classification and quantification, using hardness and case depth as benchmarks
- Apply Bayesian Structural Equation Modeling for advanced data analysis
Thomas Grevenkamp
Last position:
Senior .NET / Cloud Engineer at Freelance
Building an observability and alerting solution for Business Central Job Queue monitoring
- Built a central monitoring solution to track the Business Central Job Queue in a multi-organization environment in Azure DevOps
- Integrated Azure Application Insights and Log Analytics for structured collection and analysis of job runtimes and error events
- Developed KQL queries for targeted analysis of failed jobs and detection of error patterns
- Connected Grafana and Power BI to visualize operational metrics and job status in real time
- Implemented an automated alerting workflow with Power Automate – when a job fails, a notification email is sent immediately
- Ensured transparency about the state of productive background processes during live operations
Result: Full transparency over failed Business Central jobs · Clear reduction in response time through automated email alerting · Stable foundation for proactive operation of productive background processes
Technologies: Azure DevOps | Application Insights | Log Analytics | KQL | Grafana | Power Automate | Power BI | Business Central | Azure Monitor
Nicholas Odongo
Last position:
Management Consultant at Freelance
- Independent analysis and optimization of business processes to increase efficiency and reduce costs.
- Responsible execution of projects in the areas of financial planning and operational excellence, including the preparation of final reports.
- Close collaboration with clients and coordination of actions.
- Advising multinational companies on synthesizing financial data from Turkey, economic models from Germany, and the realities of emerging markets in Kenya to create a truly global risk picture.
- Bridging the gap between qualitative risk assessments and hard financial data. Developing models to estimate the potential financial impact of strategic risks (e.g., reputational damage, loss of key personnel).
- Further developing Enterprise Risk Management (ERM) beyond simply ticking off checklists to leverage risk information for strategic decisions, such as entering new markets with comprehensive risk awareness or acquiring companies with a complete understanding of their risk profile.
Aladdin Alzoubi
Last position:
Technical Consultant at NFON
- Presentations and workshops regarding different VOIP products and technologies
- Design of VOIP and network solutions from core to premium solutions and necessary non-standard solutions
- Processing of tenders
- Development of VOIP and network technical implementation of customer requirements
- Implement and configure different UC products on cloud
Mohamad Alosman
Last position:
Systems Engineer for Network Security at Bechtle AG
- SD-WAN solution by Aruba – Swiss energy company (330 sites): design and implementation of an SD-WAN branch solution with Aruba 9004 gateways, encrypted overlay, policy-based routing, WAN load balancing, and centralized management via Aruba Central.
- LAN/WLAN & security – schools in Germany (9 sites): deployment of Aruba switches & AP-505, FortiGate 80F firewalls; setup of Checkmk monitoring, incident and change management, and secure admin access (BeyondTrust).
- Multi-site security – energy billing company (20 sites): deployment of a complete Fortinet solution (FortiGate HA cluster, FortiSwitch PoE, FortiAP), IPsec remote-access VPN via FortiClient, centralized management via FortiCloud, IntraID authentication, operations and incident management.
- Data center migration – German client: migration of data center switches (Mellanox), firewall cluster, and OfficeConnect switches to a new data center; securing configurations, implementing HA designs, testing, monitoring, and coordinated change and incident processes. Setup of two new 6300 M VSX clustered switches.
- Data center security – university hospital: implementation of a high-availability FortiGate 400F firewall cluster across three data centers; security policy design, operational support, and change/incident management.
- Enterprise campus & network access control – manufacturing company in Germany: introduction of Aruba ClearPass NAC, setup of a VSX-based switching architecture, secure WLAN access with MPSK, and integration into existing networks.
- EU client (Germany & Poland) – Sophos firewalls: operations, incident and change management of Sophos firewalls including IPsec VPN; troubleshooting and ongoing optimization of security configurations.
- Network modernization – pharmacy client in Germany: design and rollout of core and access switching (Mellanox, Aruba Instant On), migration from Sophos to Fortinet firewalls, network segmentation, and security hardening.
Joshua Haas
Last position:
Freelancer – Project Manager at TEDI GmbH & Co. KG
- Led the Email Distribution Restructuring project to reorganize over 600 email distribution lists and mailboxes for a multinational company, aiming to improve the efficiency and scalability of internal communications.
- Conducted a comprehensive analysis of existing distribution lists to identify inefficiencies and redundancies, and defined clear naming conventions and standardized processes.
- Oversaw the cleanup of outdated and unnecessary distribution lists in line with new guidelines.
- Collaborated with the IT department to evaluate and implement automation solutions for dynamically updating distribution lists.
- Implemented a pilot phase to validate new processes, gather feedback, and refine the approach for a company-wide rollout.
- Defined responsibilities for maintaining and monitoring distribution lists and assigned them to specific roles.
- Created detailed project documentation and regular reports for management and other stakeholders.
Mustafa Köse
Last position:
Consultant (MBR Designer) at Bayer AG
Introduction of an MES system in pharmaceutical production.
Support in replacing existing recipes by introducing an MES system.
Focus on converting cleaning and manufacturing AKBs into MBRs.
System environment: Werum PAS-X MES, GMP, SAP, Microsoft Office (Word, Excel), XML
Discover over 15,000 top freelancers
Statistics of experts using SQL
Aggregated from the professional profiles of matched freelancers.
Experience
20 years (Germany: 19 years)
Position duration
1.8 years (Germany: 5.2 years)
Positions per freelancer
14 (Germany: 12)
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Manufacturing
Certification focus areas
Information Technology, Product Development, Quality Assurance
Bachelor's degree or higher
86% (Germany: 89%)
Master's degree or higher
59%
Doctorate
14% (Germany: 9%)
Certifications per freelancer
3
Most common languages
German, English, Spanish
Speak two or more languages
100% (Germany: 97%)
Based on our profile pool as of 30 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Dortmund are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Dortmund using SQL
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
What SQL does
SQL, short for Structured Query Language, is the standard way to read and change data in relational databases. Companies use it to query records, join tables, filter results, and keep business data consistent across applications, reports, and analytics tools.
Common work
- Reporting queries and dashboard data
- Data cleanup, imports, and exports
- Schema design for new tables and relations
- Query tuning for slow database calls
- Transaction logic for safe updates
Database stack
Strong SQL specialists work across PostgreSQL, MySQL, SQL Server, and Oracle Database. They know indexes, views, stored procedures, triggers, and permissions, and they understand when each database wants slightly different syntax or behavior.
When to bring one in
Bring in SQL expertise when reports do not match, queries are slow, or data lives in too many tables with weak structure. Teams in Dortmund often need extra help during migrations, analytics rollouts, or when application and reporting work must be aligned quickly.
What good specialists do
Good professionals write queries that are easy to review and safe to run. They ask about data volume, concurrency, and business rules before changing anything, then document assumptions so others can maintain the work later. They also spot bad joins, missing indexes, and unclear ownership early.
Working model
SQL work fits remote collaboration well because query files, schemas, and execution plans are easy to review in writing. On-site work can help when teams need fast access to internal data models, legacy systems, or business users who define reporting needs in plain language.
Frequently asked questions
Curious about SQL? Here are the answers that come up again and again.
SQL is used to query relational data, update records, and keep business information structured. Teams rely on it for reporting, operational workflows, dashboards, and data checks in systems such as PostgreSQL, MySQL, and SQL Server.
SQL is the better fit when data has clear relationships, strong consistency rules, and reporting needs that depend on joins. NoSQL tools are often chosen for flexible document shapes or very specific scaling patterns, but they usually trade away some of the structure that SQL gives you.
A strong SQL professional usually understands data modeling, indexing, transaction handling, and basic performance analysis. Knowledge of BI tools, ETL flows, and at least one major database engine helps because SQL is rarely used alone.
SQL work needs enough context to understand the business meaning of each table and metric. Simple queries can start quickly, but schema changes, reporting logic, and performance fixes need clear rules about data ownership, historical behavior, and acceptable trade-offs.
Yes, SQL work is often well suited to remote collaboration because queries, schema changes, and execution plans can be reviewed in text. For Dortmund teams, on-site time can still help when the data model is tied to internal processes or when stakeholders want quick feedback on reports.
Look for clean query structure, correct joins, and a habit of explaining why a change is safe. A good SQL specialist also checks indexes, avoids unnecessary subqueries, and can discuss the impact of the work on read and write performance.
Yes, SQL remains central in many systems even when the front end or service layer uses modern frameworks. It is often the last layer that defines how data is stored, filtered, and reconciled across services, reports, and admin tools.
SQL is the language; MySQL is a database system that uses it; T-SQL is Microsoft’s extended dialect for SQL Server. A good freelancer knows the shared core and also understands where dialect differences affect functions, syntax, or stored procedures.
The average hourly rate of freelancers in Dortmund, Germany who have used SQL in their recent projects is 91 €, which corresponds to a daily rate of about 725 € based on an 8-hour working day.
Of the freelancers in Dortmund, Germany who have used SQL in their recent projects, 86% hold at least a Bachelor's degree, 59% hold at least a Master's degree, and 14% hold a doctorate.
On average, freelancers in Dortmund, Germany who have used SQL in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 1.8 years.
The most common languages among freelancers in Dortmund, Germany who have used SQL in their recent projects are German (100%), English (100%), and Spanish (19%).
The most common industries among freelancers in Dortmund, Germany who have used SQL in their recent projects are Information Technology (74%), Banking and Finance (48%), and Manufacturing (48%).
The most common business areas among freelancers in Dortmund, Germany who have used SQL in their recent projects are Information Technology (81%), Product Development (74%), and Project Management (63%).
Main locations of FRATCH Experts, who have recently used SQL
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
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Dusseldorf 
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Essen 
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Dresden 
Hanover 
Nuremberg Request a free demo
Get in touch with the FRATCH team and we will get back to you within 4 hours.
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Philipp Thomaschewski
FRATCH CEO
