Professional Services

Junior Developer

We’re looking for a bright and motivated developer to build applications in server-side JavaScript however, as an eager junior developer, we don’t expect you to have had previous experience in server-side JavaScript.

Information for recruitment agencies
We have appointed a recruitment agent on a sole agency basis.
If you’re a recruitment agent, and would like to get in touch with us, please use email only: Please don’t phone!

You’ll help build Haplo Research Manager, an exciting new product for Universities.

This is a great opportunity to refine your development skills in a supportive team focused on excellent software engineering. You’ll be actively involved in every aspect of the software development process, and write software used by people who really love the work you do.

Find out more

Our team have shared some of their experiences to help you discover what working with the Haplo team is like:

Amrinderjit Singh, Software Developer

Tom Renner, Software Developer

Helen Root, Placement Student

Tech talent consultant, Steve Buckley shares his thoughts on why Haplo has got it right.

Ben Summers, Technical Director

You’ll be working on top of our open source in-house application framework, designed for building applications which manage large amounts of semi-structured data. You won’t be alone however. You will receive consistent and structured support and feedback from our Technical Director as well as longer serving members of the team. We sincerely believe in investing a significant amount of time and effort into all of our team members to ensure that they continuously go from strength to strength. One thing we don’t do though, is put undue pressure on anyone. We insist on a healthy work/life balance and we take great pleasure in insisting that everyone leaves the office at a reasonable hour every day. As a junior developer at Haplo, you will:

You’ll be working in a spacious, light-filled office in a new business development in Brockley.

We believe in good coffee, sensible working hours, and valuing the contribution of every member of the team.

You’ll just need:

There’s some notes on our technology stack below.

We’re funded entirely by revenue from our clients. With no investors, we can focus solely on producing a great product for our happy clients. We offer:

Haplo is an equal opportunities employer. We welcome applications from developers from all backgrounds, and any level of experience.

You must have a right to work in the UK.

To apply, or if you have any questions, please email


My week at Haplo

Most of my week is spent writing code, with minimal distractions. We have a quiet office and sociable lunches, which gives me plenty of focussed time to concentrate on code.

Prioritising getting things right first time means I spend very little of my week bug fixing, which is great. We develop with lots of discussion of how to design everything really well, and frequent code reviews.

I will usually have a couple of phone calls a week with clients, and possibly a site visit to discuss things in person.

We generally release on Thursdays, so that Friday can be left clear for general improvements and reflections on how we did this week.

We enjoy precision coffee making on our cafe-quality espresso machine, and semi-competitive sandwich making on extremely good bread from our local bakery.

Tom Renner, Software Developer at Haplo

Technology stack

Our technology choices have been driven by a desire for reliability and no surprises. We believe a production system is the last place you want excitement, and don’t want to work out-of-hours fixing things. This means we’ve gone for tried and tested runtimes, languages and deployment methods, but used them in imaginative ways so they’re as productive as anything else available.

This has paid off. We’ve only had a few minutes downtime in all the years we’ve been hosting applications for our customers, and it’s quick and easy to build new features and extend existing capabilities.

We’ve taken a polyglot approach, using the best language and approach for each task, with the majority of the application running on the JVM. The platform is mainly written in JRuby, Java and JavaScript, with our custom object store implemented as C++ extensions to PostgreSQL. Our infrastructure and deployment tools are written in Python.

Our products and client specific customisations are implemented as server-side JavaScript plugins, which script the rest of the platform. As we build custom applications, we refactor to extend the platform, making future development even easier and faster.

We host the application on our own hardware for control and performance, and because our customers have strict security requirements. We have automated deployment, using Puppet controlled by our own deployment scripts. We can bootstrap a new server or development VM in minutes, with cryptographic assurance that we’re running the code we intend to run. Deploying a new version is one command to publish it, and another command to deploy it, and we release a new version every few days.

But the thing we’re most proud of is the quality of our work. We’ve treated every single bit of feedback and support request as a bug report, and fixed it. This dedication to quality and the user experience mean our users are delighted with our work, don’t need to call us for help, and are a pleasure to work with.


Information for recruitment agencies

We have appointed a recruitment agent on a sole agency basis.
If you’re a recruitment agent, and would like to get in touch with us, please use email only: Please don’t phone!