Senior Backend Engineer (Go) & Technical Consultant for FinTech & Regulated Domains
Aktualisiert am 02.08.2026
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 04.01.2027
Verfügbar zu: 100%
davon vor Ort: 5%
Golang
Back-End
Software-Entwicklung
PostgreSQL
REST
Kafka
Docker
WebSocket
Linux
Requirements Engineering
Code Review
Testautomatisierung
Software-Design
RDBMS
Kubernetes
AWS
CI/CD
Prometheus
Grafana
Softwarearchitektur
German
Muttersprache
English
fluent

Einsatzorte

Einsatzorte

Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

2 years 9 months
2023-12 - now

Configuration Application for IT-Security Administrators

Senior Software Engineer & Technical Consultant Java REST Vaadin
Senior Software Engineer & Technical Consultant
  • Designed and implemented a configuration application for complex IT security systems, enabling andsimplifying administrative workflows.
  • Delivered full-stack development and system integration, improving usability and maintainability of theconfiguration platform.


Achievements:

  • Enabled the client to offer all mandatory configuration functions to customers. 
  • Improved usability for administrators significantly.

Java REST Vaadin
1 year
2024-04 - 2025-03

Regulated Trading System for Digital Assets

Senior Backend Engineer Go & Technical Consultant Golang PostgreSQL REST ...
Senior Backend Engineer Go & Technical Consultant
  • Provided technical consulting to ensure compliance with MiCA regulation for a digital asset tradingplatform.
  • Designed and implemented backend components and APIs to meet transparency and auditabilityrequirements.
  • Optimized core services for order matching and market data provisioning, improving performance andreliability under increased load.
  • Conducted candidate interviews and onboarded new engineers to ensure smooth team integration andknowledge transfer.


Achievements:

  • Enabled timely compliance with MiCA regulation, ensuring uninterrupted business operations. 
  • Reduced user issues and common support requests by resolving complex backend bugs and improvingsystem robustness.
  • Strengthened the development team through effective onboarding, mentoring and knowledge transfer.



Golang PostgreSQL REST Docker Kubernetes Kafka WebSocket FIX AWS CI/CD - Gitlab Prometheus Grafana Helm Kong
1 year 1 month
2022-09 - 2023-09

Cryptocurrency Exchange

Senior Backend Developer Go Golang PostgreSQL REST ...
Senior Backend Developer Go
  • Delivered backend features for a regulated crypto exchange, including order execution, market dataprovisioning, reporting and bookkeeping.
  • Created and presented architectural proposals to scale the microservice-based system. 
  • Identified and resolved performance bottlenecks and complex bugs in production systems. 
  • Bridged the gap between technical and business experts by advising on current system behavior, newrequirements and functional improvements.


Achievements:

  • Unlocked new revenue potential by enabling the client to offer additional services to customers. 
  • Reduced operational risk and support overhead by eliminating critical bugs and manual workarounds. 
  • Contributed to architectural planning for future scalability and maintainability.
Golang PostgreSQL REST Docker Kubernetes OpenAPI WebSocket FIX AWS CI/CD - Gitlab Prometheus Grafana Helm Kong
6 years 2 months
2016-07 - 2022-08

Algorithmic Securities Trading

Senior Software Engineer Java PostgreSQL Kafka ...
Senior Software Engineer
  • Built several software systems for a global algorithmic trading firm in the areas of trading, riskmanagement, compliance and backoffice.
  • Improved various systems to ensure increased performance, reliability and MiFID II regulatoryrequirements are met.
  • Took ownership of requirements engineering, architectural design and technical coordination in varyingcross-functional development teams.
  • Led technical interviews and mentored junior developers, helping scale engineering capabilities andmaintain software quality.


Achievements:

  • Improved overall system performance, reliability and functionality across multiple trading-relatedcomponents.
  • Supported successful MiFID II compliance through timely enhancements to risk, backoffice and tradingsystems.
  • Boosted team capabilities and quality through structured onboarding and individual mentoring.

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
3 years 11 months
2012-08 - 2016-06

Manufacturing Execution Systems

Software Engineer Java Oracle RDBMS PL/SQL ...
Software Engineer
  • Extended and customized MES solutions for pharma industry clients, focusing on ERP integration andcustomer-specific workflows.
  • Implemented and tested critical functionality alongside clients, ensuring successful acceptance in GMPregulated environments.
  • Supported product evolution by contributing domain expertise and documentation on ERP interfaces.


Achievements:

  • elivered ERP-MES integration software that met both customer-specific needs and GMP compliancerequirements.
  • Secured fitness of future ERP-MES interfaces through effective knowledge transfer and documentation.

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

Aus- und Weiterbildung

Aus- und Weiterbildung

3 years
2013-04 - 2016-03

Practical Computer Science

Master of Science, FernUniversität in Hagen
Master of Science
FernUniversität in Hagen
  • Software Engineering 
  • Programming Languages
  • Thesis: on request


Skills:

Golang

3 years 6 months
2009-09 - 2013-02

Automation and Engineering Computer Science

Bachelor of Engineering, Hochschule Harz (FH)
Bachelor of Engineering
Hochschule Harz (FH)
  • Engineering Computer Science
  • Thesis: on request


Skills:

Java, Oracle RDBMS, PL/SQL

Position

Position


Kompetenzen

Kompetenzen

Top-Skills

Golang Back-End Software-Entwicklung PostgreSQL REST Kafka Docker WebSocket Linux Requirements Engineering Code Review Testautomatisierung Software-Design RDBMS Kubernetes AWS CI/CD Prometheus Grafana Softwarearchitektur

Produkte / Standards / Erfahrungen / Methoden

Backend Development
Technical Consulting
Training

Profile

Bastian Isensee is a backend engineer and technical consultant with over 12 years of experience building reliable software systems for high-stakes, regulated domains such as finance and trading. Clients value his ability to deliver maintainable solutions where correctness, performance, and auditability are critical to business success.

Bastian specializes in Golang and uses technologies like PostgreSQL, Kafka, REST, Docker and Kubernetes. He places strong emphasis on deeply understanding business requirements to ensure technical solutions are aligned with actual needs. Alongside hands-on development, he supports teams as a trusted advisor through architecture evaluations, thorough reviews, mentoring, and technical leadership.


Backend Development

  • Reliable system design and implementation, pragmatic performance tuning, detailed issue analysis and problem-solving, constructive code reviews, effective testing, clear communication and documentation

Technical Consulting
  • Expert guidance on requirements engineering, architecture, maintainability and development processes

Training
  • Effective knowledge sharing and individual mentoring

Primary Tech Stack
  • Golang
  • PostgreSQL
  • Kafka
  • REST / WebSocket / RPC
  • Docker
  • Kubernetes
  • Linux
  • AWS
  • CI/CD - GitLab
  • Prometheus
  • Grafana
  • Cucumber / Godog

Programmiersprachen

Golang
SQL
Java

Datenbanken


Einsatzorte

Einsatzorte

Deutschland, Schweiz, Österreich
möglich

Projekte

Projekte

2 years 9 months
2023-12 - now

Configuration Application for IT-Security Administrators

Senior Software Engineer & Technical Consultant Java REST Vaadin
Senior Software Engineer & Technical Consultant
  • Designed and implemented a configuration application for complex IT security systems, enabling andsimplifying administrative workflows.
  • Delivered full-stack development and system integration, improving usability and maintainability of theconfiguration platform.


Achievements:

  • Enabled the client to offer all mandatory configuration functions to customers. 
  • Improved usability for administrators significantly.

Java REST Vaadin
1 year
2024-04 - 2025-03

Regulated Trading System for Digital Assets

Senior Backend Engineer Go & Technical Consultant Golang PostgreSQL REST ...
Senior Backend Engineer Go & Technical Consultant
  • Provided technical consulting to ensure compliance with MiCA regulation for a digital asset tradingplatform.
  • Designed and implemented backend components and APIs to meet transparency and auditabilityrequirements.
  • Optimized core services for order matching and market data provisioning, improving performance andreliability under increased load.
  • Conducted candidate interviews and onboarded new engineers to ensure smooth team integration andknowledge transfer.


Achievements:

  • Enabled timely compliance with MiCA regulation, ensuring uninterrupted business operations. 
  • Reduced user issues and common support requests by resolving complex backend bugs and improvingsystem robustness.
  • Strengthened the development team through effective onboarding, mentoring and knowledge transfer.



Golang PostgreSQL REST Docker Kubernetes Kafka WebSocket FIX AWS CI/CD - Gitlab Prometheus Grafana Helm Kong
1 year 1 month
2022-09 - 2023-09

Cryptocurrency Exchange

Senior Backend Developer Go Golang PostgreSQL REST ...
Senior Backend Developer Go
  • Delivered backend features for a regulated crypto exchange, including order execution, market dataprovisioning, reporting and bookkeeping.
  • Created and presented architectural proposals to scale the microservice-based system. 
  • Identified and resolved performance bottlenecks and complex bugs in production systems. 
  • Bridged the gap between technical and business experts by advising on current system behavior, newrequirements and functional improvements.


Achievements:

  • Unlocked new revenue potential by enabling the client to offer additional services to customers. 
  • Reduced operational risk and support overhead by eliminating critical bugs and manual workarounds. 
  • Contributed to architectural planning for future scalability and maintainability.
Golang PostgreSQL REST Docker Kubernetes OpenAPI WebSocket FIX AWS CI/CD - Gitlab Prometheus Grafana Helm Kong
6 years 2 months
2016-07 - 2022-08

Algorithmic Securities Trading

Senior Software Engineer Java PostgreSQL Kafka ...
Senior Software Engineer
  • Built several software systems for a global algorithmic trading firm in the areas of trading, riskmanagement, compliance and backoffice.
  • Improved various systems to ensure increased performance, reliability and MiFID II regulatoryrequirements are met.
  • Took ownership of requirements engineering, architectural design and technical coordination in varyingcross-functional development teams.
  • Led technical interviews and mentored junior developers, helping scale engineering capabilities andmaintain software quality.


Achievements:

  • Improved overall system performance, reliability and functionality across multiple trading-relatedcomponents.
  • Supported successful MiFID II compliance through timely enhancements to risk, backoffice and tradingsystems.
  • Boosted team capabilities and quality through structured onboarding and individual mentoring.

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
3 years 11 months
2012-08 - 2016-06

Manufacturing Execution Systems

Software Engineer Java Oracle RDBMS PL/SQL ...
Software Engineer
  • Extended and customized MES solutions for pharma industry clients, focusing on ERP integration andcustomer-specific workflows.
  • Implemented and tested critical functionality alongside clients, ensuring successful acceptance in GMPregulated environments.
  • Supported product evolution by contributing domain expertise and documentation on ERP interfaces.


Achievements:

  • elivered ERP-MES integration software that met both customer-specific needs and GMP compliancerequirements.
  • Secured fitness of future ERP-MES interfaces through effective knowledge transfer and documentation.

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

Aus- und Weiterbildung

Aus- und Weiterbildung

3 years
2013-04 - 2016-03

Practical Computer Science

Master of Science, FernUniversität in Hagen
Master of Science
FernUniversität in Hagen
  • Software Engineering 
  • Programming Languages
  • Thesis: on request


Skills:

Golang

3 years 6 months
2009-09 - 2013-02

Automation and Engineering Computer Science

Bachelor of Engineering, Hochschule Harz (FH)
Bachelor of Engineering
Hochschule Harz (FH)
  • Engineering Computer Science
  • Thesis: on request


Skills:

Java, Oracle RDBMS, PL/SQL

Position

Position


Kompetenzen

Kompetenzen

Top-Skills

Golang Back-End Software-Entwicklung PostgreSQL REST Kafka Docker WebSocket Linux Requirements Engineering Code Review Testautomatisierung Software-Design RDBMS Kubernetes AWS CI/CD Prometheus Grafana Softwarearchitektur

Produkte / Standards / Erfahrungen / Methoden

Backend Development
Technical Consulting
Training

Profile

Bastian Isensee is a backend engineer and technical consultant with over 12 years of experience building reliable software systems for high-stakes, regulated domains such as finance and trading. Clients value his ability to deliver maintainable solutions where correctness, performance, and auditability are critical to business success.

Bastian specializes in Golang and uses technologies like PostgreSQL, Kafka, REST, Docker and Kubernetes. He places strong emphasis on deeply understanding business requirements to ensure technical solutions are aligned with actual needs. Alongside hands-on development, he supports teams as a trusted advisor through architecture evaluations, thorough reviews, mentoring, and technical leadership.


Backend Development

  • Reliable system design and implementation, pragmatic performance tuning, detailed issue analysis and problem-solving, constructive code reviews, effective testing, clear communication and documentation

Technical Consulting
  • Expert guidance on requirements engineering, architecture, maintainability and development processes

Training
  • Effective knowledge sharing and individual mentoring

Primary Tech Stack
  • Golang
  • PostgreSQL
  • Kafka
  • REST / WebSocket / RPC
  • Docker
  • Kubernetes
  • Linux
  • AWS
  • CI/CD - GitLab
  • Prometheus
  • Grafana
  • Cucumber / Godog

Programmiersprachen

Golang
SQL
Java

Datenbanken


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