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hackajob Tech Stack

AI recruiting agent matching jobseekers and companies with explainable recommendations

Software Development London 51–200 employees Founded 2014 Privately Held

hackajob builds Archer, an AI recruiting agent designed to match jobseekers with roles and help companies source high-fit candidates before they reach the ATS. The tech stack—Java, Python, React, Elasticsearch, AWS, Kubernetes—reflects a dual consumer and B2B platform. Heavy investment in AI model optimization (LLM observability tools like Langfuse and LangSmith), plus active hiring across ML, data, and security roles, signals focus on model quality and compliance; simultaneously replacing Ruby on Rails and investing in Rust and Go suggests a shift toward performance-critical infrastructure.

Tech Stack 200 technologies

AdoptingGitHub Copilot Jira Confluence Go React Rust Langfuse LangSmith+9 more
ReplacingRuby on Rails MBSE

What hackajob Is Building

Challenges

  • Security compliance
  • Managing risk
  • Risk mitigation
  • Process inefficiencies
  • Maintaining consistency and reliability across benchmarks
  • Identifying ai vulnerabilities
  • Streamlining processes
  • Identifying opportunities
  • Compliance with data regulations
  • Improving delivery speed

Active Projects

  • Ai performance optimization
  • Pipeline engine development
  • Design questions for ai training
  • Fraud detection
  • Train ai models
  • Infrastructure platform development
  • Incident response
  • Scalable ml pipelines
  • Next-generation fp&a platform
  • Benchmarking and improving model performance and training speed across real ml workloads

Hiring Activity

Accelerating1,400 roles · 950 in 30d

Department

Engineering
487
Data
138
Sales
125
Finance
106
Product
102
Security
87
Ops
84
Support
50

Seniority

Senior
521
Mid
388
Lead
92
Junior
84
VP
80
Manager
71
Director
55
Principal
28

Notable leadership hires: Cyber Threat Lead, Product Strategy Lead, Engineering Lead, QA Lead, M&A Assistant Director

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About hackajob

hackajob operates a two-sided recruiting platform: Archer serves jobseekers as an AI advocate that surfaces matched roles with explainability, and serves companies as an always-on sourcing and qualification agent. Founded in 2014 and based in London, the company operates across the UK, India, US, and Canada. Current workforce spans 51–200 employees with hiring accelerating across engineering, data, sales, and security—indicating scaled product-market fit and expansion into compliance and model reliability. The company's roadmap centers on tens of millions of jobseekers and tens of thousands of enterprise customers.

HeadquartersLondon
Company Size51–200 employees
Founded2014
Hiring MarketsUnited Kingdom, India, United States, Canada

Frequently Asked Questions

What tech stack does hackajob use?

Primary stack: Java, Python, React, Elasticsearch, AWS, Kubernetes, Docker. Adopting LLM observability (Langfuse, LangSmith), GitHub Copilot, Rust, and Go. Replacing Ruby on Rails and MBSE.

What is hackajob working on?

AI performance optimization, pipeline engine and infrastructure platform development, ML model benchmarking, fraud detection, and incident response. Active focus on scalable ML pipelines and model training speed across real workloads.

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