Ben Lachs, Developer in Sydney, New South Wales, Australia
Ben is available for hire
Hire Ben

Ben Lachs

Data Engineer and Developer

Sydney, New South Wales, Australia

Toptal member since April 29, 2026

Expertise
Data EngineeringPythonSQLData AnalysisData WarehouseData ScienceAWSJSONDatabaseSpring BootNumPyAmazon S3
Bio

Ben, a professional with decades of programming experience, excels in Java Spring Boot, Python (including numpy and pandas for quantitative analysis), and back-end and data engineering. An AWS Certified Solutions Architect with 9 years of experience, he holds qualifications in telecommunication engineering, economics, mathematics, and quantitative finance. Ben is proficient in derivative pricing, trading strategies, and risk management, showcasing a diverse skill set across multiple domains.

Portfolio

Commonwealth Bank of Australia
Java 17, Spring Boot, Swagger, OpenAPI, APIs, REST

Experience

  • Java 21 - 20 years
  • Python 3 - 20 years
  • SQL - 20 years
  • Amazon Web Services (AWS) - 14 years
  • Spring Boot - 7 years
  • Pandas - 5 years
  • NumPy - 5 years
  • Amazon Athena - 3 years

Preferred Environment

IntelliJ IDEA, PyCharm, DBeaver, Amazon Athena, AWS Glue

The most amazing...

...projects I’ve worked on have spanned a variety of niche areas, including EFX vendor trading systems, global crypto market-making, and aircraft fleet scheduling.

Work Experience

Principal Software Engineer

2023 - 2024
Commonwealth Bank of Australia
  • Developed integrations with banking EFX REST APIs.
  • Facilitated a trade finance business flow and integrated it into vendor systems.
  • Conducted discovery on business domains and vendor product functionality.
Technologies: Java 17, Spring Boot, Swagger, OpenAPI, APIs, REST

Experience

Aircraft Fleet Scheduling

Engaged in transforming a legacy system dedicated to overseeing aircraft fleet scheduling, integrating inputs from various sources such as scheduling systems, airports, fueling, baggage services, and real-time aircraft data (ACARS aircraft teletext messages). I addressed intricate scenarios encompassing ground returns, air returns, and diversions within a confidential project setting.

Certifications

FEBRUARY 2018 - JANUARY 2027

AWS Certified Solutions Architect Associate

Amazon Web Services

Skills

Libraries/APIs

Pandas, NumPy, PySpark, OpenAPI

Tools

Amazon Athena, IntelliJ IDEA, PyCharm, AWS Glue

Languages

Java 21, Python 3, SQL, Python

Frameworks

Spring Boot, Spark, Swagger

Paradigms

ETL, Role-based Access Control (RBAC), OLAP, REST

Platforms

AWS IoT, Amazon Web Services (AWS)

Storage

Data Pipelines, JSON, Amazon S3 (AWS S3), OLTP, DBeaver

Other

Data Engineering, Data Warehousing, Data Analytics, RESTFul APIs, Data Analysis, Medallion Architecture, Large Data Sets, Large-scale Data Processing, Data Modeling, Relational Database Design, API Integration, Agentic Coding, Data Architecture, Java 17, APIs

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

1

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring