Senior ML Engineer

True Software Scandinavia AB; Stockholms kommun; Hybrid; SEK 900,000 - 1,300,000; Full time

Benefits offered by this job

Competitive salary

30 days vacation

Private health insurance

Pension

Parental leave top-up

Wellness contributions

Hybrid work model

Job summary

Truecaller is seeking a Senior ML Engineer to optimize training and deployment of ML models, including on-device inference for mobile privacy and better user experience. This role blends hands‑on model work with collaborating across teams to establish best practices and tools for efficient ML development and deployment on mobile platforms.

You will drive continuous innovation, staying ahead in ML trends and exploring areas like federated learning to keep Truecaller at the cutting edge and

Qualifications

• 5+ years of experience in machine learning engineering.

Responsibilities

• Define roadmaps with your manager to meet developer and organisational needs.
• Deploy models to production quickly and cost‑effectively across teams.
• Optimise ML models for mobile devices and on‑device inference.
• Serve as the go‑to expert for mobile model development and deployment.
• Stay up to date with ML trends and drive innovation across Truecaller.

Skills

ML engineering

Android development

iOS development

English communication

Collaborative teamwork

Customer-focused mindset

Education

Degree in computer science or equivalent

Tools

TensorFlow

PyTorch

ONNX

TensorFlow Lite

Core ML

ONNX Runtime Mobile

Job description

Join Truecaller – The place where innovation meets impact!

Truecaller's mission is to build trust in communication by making it safer, smarter, and more efficient. Born in Sweden, trusted by the world, and here’s why we stand out:

• We are trusted by over 450 million active users every month across 190+ countries
• We identify over 15 billion calls daily, helping users avoid spam and scams
• We are powered by a team of 450+ employees from 45+ nationalities

We always look for people who take initiative, own their work, and keep raising the bar. An entrepreneurial mindset matters here, especially when it turns bold ideas into real actions. We stay collaborative and focused, always searching for smarter paths forward. If you want to make an impact and grow with a team that inspires millions, you’ll fit right in.

The role

As a Senior ML Engineer, you will be working hands‑on to optimise the training and deployment of ML models to be quick and cost‑efficient. You will also be at the forefront of putting our ML models on mobile devices to enhance data privacy and customer experience. To achieve this, you will need to collaborate with teams across Truecaller to establish best practices and tools for efficient ML model development and deployment, particularly on mobile platforms. You will be expected to help Truecaller reach and remain at the cutting edge of ML training and deployment, and explore new frontiers such as federated learning.

What you will do

• Understand the current and future needs of developers and the organisation, and create a roadmap with your manager for meeting those needs.
• Work with teams across Truecaller, enabling them to deploy models to production quickly and cost‑effectively.
• Work hands‑on with teams throughout Truecaller to optimise ML models for mobile devices.
• Be the go‑to expert for developing models for mobile devices as well as deploying them.
• Stay up to date with the latest trends and technologies in ML Engineering, especially ML on mobile phones, and drive continuous innovation throughout Truecaller.

What you bring in

• Degree in computer science or equivalent
• 5+ years of experience in machine learning engineering, with a focus on deploying ML models in production environments.
• A strong understanding and experience to optimise feature engineering, model training, and model deployment.
• Hands‑on experience deploying ML models on mobile devices (e.g., TensorFlow Lite, Core ML, ONNX Runtime Mobile).
• Strong understanding of machine learning frameworks (TensorFlow, PyTorch, ONNX) and their deployment on mobile platforms.
• Understanding of both Android and iOS development and how that impacts ML model deployment and usage.
• Strong communication and collaboration skills, with the ability to work effectively across different teams and disciplines.
• A customer‑focused mindset.
• Excellent communication skills in spoken and written English.

What we offer

• A comprehensive compensation package: competitive salary, 30 days of paid vacation, private health insurance, parental leave top‑up, pension, and wellness contributions.
• Modern tools to do your best work: choose your preferred computer and phone within our budget, so you can work comfortably and efficiently.
• A people‑focused office culture: we value in‑person collaboration and follow an office‑first model, with some flexibility. Our offices offer a vibrant environment with opportunities to learn, connect, and recharge, from breakfast, lunch, and well‑stocked snack stations and quiet spaces to team activities such as movie nights, tech meetups, and cultural events. There's something for everyone.
• Truecaller’s “Lab Days” offer a space for imagination: 5 times per year for 3 days, where everyone steps away from normal tasks to explore new, bold ideas and build things they’ve always wanted to. It’s a space where curiosity leads the way, and prototypes take shape. Some concepts even make it into production, and a few have grown into real features used by millions today. Lab Days allow you to be creative, learn fast, and help shape Truecaller's future.

Come as you are

Truecaller is committed to building a diverse and inclusive team. We believe that a wide range of backgrounds, perspectives, and experiences strengthens our products and our culture. No matter where you're from, what language you speak, or how you identify, we value what makes you unique and would love to get to know you.