Full-Time

Staff Engineer Application Security

Posted on 12/9/2025

Appen

Appen

10,001+ employees

Provides human-annotated data for AI training

No salary listed

Hyderabad, Telangana, India

In Person

Category
IT & Security (1)
Required Skills
Bash
Python
AWS
penetration testing
DevOps
Requirements
  • Bachelor’s or Master’s degree in Computer Science, Information Security, or a related field.
  • 10+ years of experience in Application Security, including secure software development and architecture.
  • Strong knowledge of secure coding practices, OWASP Top 10, and common application vulnerabilities.
  • Hands-on experience with security tools such as Snyk, SonarCloud, Burp Suite, Nessus, and others.
  • Threat detection and incident response: familiar with security incidents, ability to develop proactive strategies to mitigate risks through close collaboration with teams.
  • Familiarity with cloud security principles, preferably in AWS environments.
  • Experience with CI/CD pipelines and integrating security into DevOps workflows (DevSecOps).
  • Strong scripting and automation skills (e.g., Python, Bash, or similar).
  • Excellent problem-solving skills and the ability to think like an attacker.
Responsibilities
  • Lead the design and implementation of application security architecture across our SaaS platforms.
  • Conduct security assessments, threat modelling, and code reviews to identify and mitigate vulnerabilities.
  • Perform technical security assessments and reviews, research, uncover, and reproduce vulnerabilities, design secure protocols and systems, and write tests and fuzzers to drive architecture changes
  • Collaborate with Engineering and Platform teams to integrate security best practices into the CI/CD pipeline.
  • Perform penetration testing, security audits, and vulnerability assessments.
  • Develop and maintain secure coding standards, guidelines, and training programs for engineering teams.
  • Implement and manage security tools such as SAST, DAST, and other security automation solutions.
  • Stay up to date with emerging security threats, technologies, and industry best practices.
  • Respond to security incidents and work with incident response teams to investigate and remediate issues.
  • Mentor and guide junior security engineers, fostering a culture of security awareness and continuous improvement.
  • Review, develop and document secure operational best practices, and provide security guidance for engineers and various internal and external partners
  • Develop and manage a secure software development lifecycle
  • Research, recommend, and develop security tools and technologies to strengthen defenses against emerging threats and vulnerabilities
Desired Qualifications
  • Relevant certifications such as CISSP, OSCP, CEH, or similar are highly desirable.
  • Relevant work experience in offensive security, penetration testing or red teaming
  • Experience securing SaaS applications built with Java Spring and React.
  • Familiarity with container security in Kubernetes (EKS) environments.
  • Knowledge of compliance standards such as GDPR, SOC 2, or ISO 27001.
  • Exposure to monitoring and alerting tools like New Relic, Datadog, or similar.

Appen creates and curates large datasets used to train and improve artificial intelligence. It relies on a global, crowdsourced workforce to produce human-annotated data across text, images, audio, and video, which powers AI systems such as search engines and social feeds. Its products include data annotation services and platforms (like Figure Eight) and specialized data like mobile location data (Quadrant) to support ML pipelines. The company differentiates itself through scale, a broad range of data types, and a history of strategic acquisitions that expand its capabilities (e.g., Leapforce for search relevance, Figure Eight for annotation tooling, Quadrant for location data), enabling end-to-end data supply for enterprise AI. Its goal is to help organizations build reliable AI by providing high-quality labeled data and to capitalize on opportunities in generative and enterprise AI while returning to profitability under new leadership.

Company Size

10,001+

Company Stage

IPO

Headquarters

Sydney, Australia

Founded

1996

Simplify Jobs

Simplify's Take

What believers are saying

  • China revenue surged 70.7% in 2024, establishing market leadership.
  • Global Product revenue grew 221.9% to $31.3 million in 2024.
  • $50 million raised in 2025 funds generative AI expansion opportunities.

What critics are saying

  • Google contract loss in 2024 cut 37% from Global segment revenue.
  • OpenAI and Meta build in-house tools, eroding Appen's outsourcing demand by 2027.
  • CrowdGen payment issues since September 2025 trigger contributor exodus.

What makes Appen unique

  • Appen leverages 30-year proprietary metadata repository from billions of data judgments.
  • Appen excels in RLHF for frontier LLMs, supporting 80% of top builders.
  • Appen's GDPR and SOC2 compliance secures government and healthcare contracts.

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Benefits

Remote Work Options

Professional Development Budget

Flexible Work Hours

Company News

Yahoo Finance
Mar 26th, 2026
Appen forecasts up to $300M revenue as earnings expected to surge 73% annually

Appen, an AI lifecycle company specialising in data sourcing and annotation, is navigating growth prospects despite current challenges. The company expects revenue growth of 14% annually, outpacing the Australian market's 6% average, with earnings forecast to surge approximately 73% annually over the next three years. Despite reporting a net loss increase to $21.82 million in FY2025 from $20.01 million previously, Appen projects revenues between $270 million and $300 million for FY2026. The company maintains focus on research and development investments to remain competitive in the AI and data annotation sector. With a market capitalisation of A$416.77 million, Appen generates revenue through its China and Global segments, contributing $104.11 million and $127.87 million respectively.

International Finance Publications Limited
Mar 13th, 2026
Business Leader of the Week: CEO Andrew Ettinger to reinvent Hume AI

Business leader of the week: CEO Andrew Ettinger to reinvent Hume AI. March 13, 2026 Hume AI CEO Andrew Ettinger will be responsible for accelerating the tech company's momentum in research services International Finance Business Desk Hume AI, the leading voice AI research company dedicated to aligning artificial intelligence with human well-being, recently announced a new CEO. The new boss, Andrew Ettinger, who has 15 years of leadership in data and AI infrastructure, building and scaling teams responsible for over USD 2 billion in ARR (Annual Recurring Revenue) at companies like Pivotal, Astronomer, and Appen, will now accelerate the tech company's momentum in research services. Andrew Ettinger recently served as Chief Revenue Officer at Appen, where he led commercial operations supplying hyperscalers and AI labs with proprietary datasets and LLM evaluation software. Appen is a leading AI data collection company that delivers high-quality, custom data across all languages and modalities (text, image, audio, and video) to create tailored datasets for training diverse AI models. New York-based data company Astronomer specialises in DataOps and AI orchestration. The company's flagship platform, Astro, allows businesses to build, manage, and scale complex data pipelines and AI workflows. Reacting to the news of his hiring, Ettinger said, "Voice in AI is evolving from a feature to the primary interface for the next generation of applications and devices. Understanding emotion will be essential to unlocking AI's full potential, and that will require ongoing systems that incorporate human-in-the-loop feedback. That's where Hume AI's data, annotation, and reinforcement-learning infrastructure is setting the pace for the industry." Hume AI recently agreed to license certain technologies non-exclusively to Google. Additionally, co-founder Alan Cowen has joined the company led by Sundar Pichai. Tough Test Awaits Andrew Ettinger Andrew Ettinger has a rich portfolio of guiding data and AI infrastructure-related companies, and his background is rooted in scaling enterprises. He studied Business Marketing at The Ohio State University. Rather than focusing on engineering or academia, Ettinger has leaned into growth, revenue, and, most importantly, figuring out how to take emerging technologies and turn them into sustainable businesses. Over the years, Andrew Ettinger has developed a reputation for helping startups move from early traction to serious revenue scale. A significant part of that was developing go-to-market strategies, building sales teams, establishing customer success structures, forging partnerships, and addressing the operational side that often determines whether a tech company can sustain its momentum beyond its early stages. One of Andrew Ettinger's more visible roles was at Pivotal Software, where he was involved during a high-growth phase. The company expanded rapidly, and Ettinger played a part in scaling revenue significantly before its IPO. Later, at Astronomer, he worked in global sales leadership, helping expand enterprise adoption of data and open-source tools. The roles at Pivotal Software and Astronomer helped Ettinger master the art of commercialising complex technical products for large customers. As already mentioned, Andrew Ettinger served as Chief Revenue Officer at Appen before becoming CEO at Hume AI. Appen provides data and evaluation services used to train and improve machine learning systems. That role put him right in the middle of the AI infrastructure world, working with major labs and technology companies, and gave Hume AI's new CEO direct exposure to how modern AI products are built and deployed. Hume AI, in the coming months, will be eyeing a fresh restart, as its previous CEO, Alan Cowen, along with several of the top engineers, got snapped up by Google in January 2026 in another incident of talent poaching, where promising individuals from small AI startups are being "inducted" into the fold of global tech titans. Cowen and his former Hume AI colleagues will now work with DeepMind to improve Gemini's voice features, as per WIRED. While Hume AI will continue to supply its technology to other AI firms, Andrew Ettinger, who joined the company a couple of weeks back before being promoted as the CEO, told TechCrunch that Google has a "non-exclusive right to certain technologies, and we'll be infusing that into their processes." According to reports, his immediate priority will be to release new models in the coming months and set up Hume AI to bring in USD 100 million in revenue this year. Hume AI, to some extent, has become a victim of the new trend called "acqui-hire," where tech biggies poach top AI talent (including startups' teams) to stay ahead of the innovation curve, while skirting regulatory scrutiny by acquiring a startup's talented individuals rather than the company outright. In 2025, Google followed the same template by acquiring viral AI coding startup Windsurf's CEO and other top researchers. OpenAI, which itself started as a non-profit research lab in 2015, has been a prominent practitioner of acqui-hire, bringing in several startup teams in recent months, including Convogo and Roi. Hume AI, which dubs its model as the "World's Most Realistic and Expressive Voice AI," has customised the tool to understand a user's emotions and mood based on their voice. In 2024, the startup launched its "Empathetic Voice Interface," a conversational AI with emotional intelligence. The company has raised funding close to USD 80 million to date, according to PitchBook. It only made sense for Google, which has been steadily improving its Gemini Live feature, which allows a user to have conversations with the chatbot, to go after Alan Cowen and his colleagues to refine the tech giant's product further and beat the industry competition.

Appen
Oct 22nd, 2024
Message from Appen CEO Ryan Kolln: Payment Issues for Contributors Are Being Resolved; Next Steps

At the beginning of September, Appen launched its new contributor platform, CrowdGen.

Business News Australia
Oct 11th, 2024
Appen returns to underlying profitability, rattles the tin for $50m to fund GenAI opportunities

After pulling itself up by the bootstraps when a major contract fell through with Google earlier this year, Sydney-based artificial intelligence (AI) annotation and services group Appen (ASX: APX) has announced a return to underlying profitability in the September quarter and is now raising $50 million to take advantage of generative AI (GenAI) opportunities.

Appen
Oct 11th, 2024
How ReflexAI Empowers Veterans with AI Mental Health Support

To meet their goals, ReflexAI partnered with Appen to gather high-quality training data and fine-tune their AI model for realistic, empathetic conversations while prioritizing responsible AI development and human feedback.

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