The software engineering landscape has changed drastically in the past decade. New languages, frameworks, infrastructure paradigms and best practices have emerged. So what fundamental competencies should aspiring software engineers focus on acquiring first?
At A115, we are firm believers in sticking to the fundamentals and mastering time-proven tools and technologies. In this guide, we break down the core technical and business analysis skills modern software engineers need to thrive in today's market. Follow these recommendations to future-proof your career and set yourself up for success.
Master One Back-End Language Deeply
Become an expert in one back-end programming language. We recommend Python for its versatility, but other popular options include JavaScript (Node.js), Go, Rust and Elixir / Erlang. Regardless of your choice, learn its syntax thoroughly and become well familiar with its standard library. Understand how to structure large projects, leverage standard tooling and frameworks, write unit and functional tests and ensure automatic enforcement of a baseline level of code quality.
Aim to become a seasoned pro in one language first rather than jumping around. This will allow you to learn faster and code more efficiently compared to juggling multiple languages as a beginner.
Become Familiar with Linux-based Environments
Get comfortable navigating Linux environments and using command line interfaces. Most professional development happens directly on Unix-based operating systems like Linux and MacOS rather than Windows. Deployed software typically runs on Linux or other Unix variants.
Learning bash scripting and Linux tools will make you much more productive compared to only knowing graphical user interfaces. And Linux environments provide more transparency into how systems actually work under the hood.
Start by installing Linux (like Ubuntu) natively or through a virtual machine, and use it for all your coding projects.
Learn SQL Basics
Knowing basic SQL is a must for any back-end developer. Start by getting familiar with SQLite locally or an open source database like PostgreSQL.
Standard SQL allows you to structure, manipulate and query data efficiently across almost any database system. You don't need to learn multiple proprietary query languages.
Practice regularly with SQL to directly access and analyse datasets. This will complement the programming language side in building fully functional applications.
Understand Core Web Architecture Principles
Learn how the HTTP protocol works. Learn how to build web-based applications and APIs using a modern framework like FastAPI or Django (for Python). Grasp core concepts like request-response cycles, MVC patterns, templating, routing, and JWT authentication.
Understand how clients or other microservices can interact with your back-end REST APIs. You don't need to know how to build full-stack apps, but you should understand how front-end components interface with your APIs, so your designs can be easy to work with.
Get Up to Speed on Containers and Cloud Infrastructure
Gain familiarity with containers via a tool like Docker. Containers allow bundling application dependencies into standardised units for smooth deployment anywhere.
Additionally, get hands-on experience leveraging at least one major cloud provider. AWS, GCP and Azure all offer free tiers. Learn how to provision infrastructure like virtual machines, databases and object storage programmatically (e.g. using Boto3 in Python.)
These skills will enable you to deploy and run applications reliably on elastic infrastructure, whether on-premises or the cloud.
Grasp Essentials of CI/CD Pipelines
Leverage Continuous Integration / Continuous Deployment (CI/CD) platforms like GitHub Actions to automate building, testing and deployment of code changes.
Modern development moves fast - manually managing releases is not sustainable. Learn CI/CD basics to standardise the inner development loop and gain confidence that changes don't break existing functionality.
This establishes a scalable pathway to ship features faster without sacrificing quality.
Always Start by Understanding the Business Context
Beyond technical skills, great software engineers need to deeply comprehend the business domain they are coding for. Before jumping to solutions, seek to grasp the real-world concepts, processes and problems your software aims to improve.
Talk to users, ask probing questions beyond surface-level requirements and constantly iterate your mental models around what business challenges technology can help solve. Curiosity is what separates good from great developers.
Conclusion
Mastering these well-rounded competencies requires dedicated focus over an extended period.
Desks pay £850 a day for developers who understand this.
£850 is the UK contract median for energy trading developers (ITJobsWatch, 2026), and analysts and business analysts who understand the trade are hired for the same reason. The free Fundamentals path takes about a week part-time. If you have a date, an interview, a start, a go-live, say so when you join and Jordan Dimov will give you the reading order. On Premium, Jordan reviews your code and your CV.
Day rates: IT Jobs Watch, UK contracts, six months to 9 November 2026.
"Jordan's in-depth explainers on topics ranging from interconnector flows to viewing gas-fired generators through option frameworks helped me get my role as an analyst on a power and gas trading desk." Tom R.
Aiming for a role? Quant developer · ETRM business analyst · Power market analyst · Trading technology teams
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