Bastian I. - Senior Backend Engineer Go & Technical Consultant

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Aumühle, Germany

Experience

Apr 2024 - Mar 2025

1 year

Senior Backend Engineer Go & Technical Consultant

Regulated trading system for digital assets

Responsibilities:

Technical consulting to meet regulatory MiCA requirements for a digital trading platform
Designing and developing backend components and APIs to comply with transparency and auditability requirements
Optimizing core features in order execution and market data delivery for performance and reliability under heavy load
Conducting interviews and structured onboarding of new developers

Achievements:

Successfully and timely implemented the regulatory MiCA requirements, ensuring uninterrupted operations
Reduced user issues and common support tickets by resolving complex backend problems
Strengthened the development team through effective onboarding, mentoring, and knowledge transfer

Technologies:

Golang, PostgreSQL, REST, Docker, Kubernetes, Kafka, WebSocket, FIX, AWS, CI/CD - GitLab, Prometheus, Grafana, Helm, Kong

Dec 2023 - Present

1 year 11 months

Senior Software Engineer & Technical Consultant

Configuration application for IT security administrators

Responsibilities:

Designing and developing a configuration application for complex IT security systems to support and simplify administrative workflows
Implementing a full integration into existing software systems while improving usability and maintainability

Achievements:

Delivered all key configuration features to the end customer
Significantly improved usability for administrators

Technologies:

Java, REST, Vaadin

Sep 2022 - Sep 2023

1 year 1 month

Senior Backend Developer Go

Cryptocurrency exchange platform

Responsibilities:

Developing backend features for a regulated crypto exchange in order execution, market data delivery, reporting, and accounting
Designing and presenting architecture proposals to scale the existing microservice landscape
Identifying and fixing performance issues and complex bugs in the production system
Advising business experts on current system behavior, new requirements, and functional improvements

Achievements:

Delivered new features to end users, expanding revenue opportunities
Reduced operational risks and support effort by fixing bugs and eliminating manual workarounds
Contributed to architecture planning to ensure long-term scalability and maintainability

Technologies:

Golang, PostgreSQL, REST, Docker, Kubernetes, OpenAPI, WebSocket, FIX, AWS, CI/CD - GitLab, Prometheus, Grafana, Helm, Kong

Jul 2016 - Aug 2022

6 years 2 months

Senior Software Engineer

Algorithmic securities trading

Responsibilities:

Developing various software systems for a global algorithmic securities trader in trading, risk management, compliance, and back office
Improving systems to meet increased demands for performance, reliability, and regulation under MiFID II
Taking responsibility for requirements analysis, architecture design, and technical coordination in cross-functional teams
Leading technical interviews and mentoring junior developers to boost development performance and quality

Achievements:

Significantly improved performance, reliability, and functionality across large parts of the software landscape
Successfully met all regulatory requirements under MiFID II by timely adapting systems for risk management, back office, and trading
Enhanced the development team's performance and quality through structured onboarding and personalized mentoring

Technologies:

Java, PostgreSQL, Kafka, REST, Linux, Docker, OpenAPI, Bash, AWS, CI/CD - GitLab/Jenkins, MongoDB, Maven, JUnit, Mockito, Vert.x, React, Spring Boot/MVC/Data, Hibernate, Vaadin

Aug 2012 - Jun 2016

3 years 11 months

Software Engineer

Manufacturing execution systems for the pharmaceutical industry

Responsibilities:

Extending and customizing MES solutions for pharmaceutical clients with a focus on ERP integration and customer-specific workflows
Implementing and acceptance testing of business-critical features in collaboration with end users while adhering to regulatory requirements like GMP
Advising the product team on evolving the MES towards future ERP interfaces

Achievements:

Successfully delivered custom ERP-MES integrations with regulatory requirements in mind
Prepared the next generation of MES with a future-proof ERP interface through effective knowledge transfer and documentation

Technologies:

Java, Oracle RDBMS, PL/SQL, RabbitMQ, CI/CD - Jenkins, Maven, JUnit, Mockito, Spring

Summary

Bastian Isensee is a backend developer and technical consultant with over 12 years of experience building reliable software systems for regulated and business-critical industries like financial services and trading platforms. Clients value his ability to deliver maintainable solutions where correctness, performance, and auditability are essential for business success.

Bastian specializes in Golang and works with technologies such as PostgreSQL, Kafka, REST, Docker, and Kubernetes. He places great emphasis on deeply understanding business requirements to implement technical solutions that meet actual needs. Beyond hands-on development, he supports teams as a trusted advisor on architecture decisions, thorough code reviews, mentoring, and technical leadership.

Service Offerings:

Backend Development:

Reliable design and implementation, pragmatic performance tuning, detailed analysis and troubleshooting, constructive code reviews, effective testing, clear communication, and documentation

Technical Consulting: